diff --git a/python/core/core_auto.sip b/python/core/core_auto.sip
index d171204bc9e..d49f11808ee 100644
--- a/python/core/core_auto.sip
+++ b/python/core/core_auto.sip
@@ -30,6 +30,7 @@
 %Include qgsdataitemproviderregistry.sip
 %Include qgsdatasourceuri.sip
 %Include qgsdatetimestatisticalsummary.sip
+%Include qgsdatumtransform.sip
 %Include qgsdbfilterproxymodel.sip
 %Include qgsdefaultvalue.sip
 %Include qgsdiagramrenderer.sip
diff --git a/python/core/qgscoordinatetransform.sip b/python/core/qgscoordinatetransform.sip
index 1c00caab7ac..9da72d9a718 100644
--- a/python/core/qgscoordinatetransform.sip
+++ b/python/core/qgscoordinatetransform.sip
@@ -254,36 +254,7 @@ otherwise points are transformed from destination to source CRS.
 Returns true if the transform short circuits because the source and destination are equivalent.
 %End
 
-    struct TransformPair
-    {
-
-      TransformPair( int sourceTransformId = -1, int destinationTransformId = -1 );
-%Docstring
-Constructor for a TransformPair with the specified ``sourceTransformId``
-and ``destinationTransformId`` transforms.
-%End
-
-      int sourceTransformId;
-%Docstring
-ID for the datum transform to use when projecting from the source CRS.
-
-.. seealso:: :py:func:`QgsCoordinateTransform.datumTransformCrsInfo()`
-%End
-
-      int destinationTransformId;
-%Docstring
-ID for the datum transform to use when projecting to the destination CRS.
-
-.. seealso:: :py:func:`QgsCoordinateTransform.datumTransformCrsInfo()`
-%End
-
-      bool operator==( const QgsCoordinateTransform::TransformPair &other ) const;
-
-      bool operator!=( const QgsCoordinateTransform::TransformPair &other ) const;
-
-    };
-
-    static QList< QgsCoordinateTransform::TransformPair > datumTransformations( const QgsCoordinateReferenceSystem &source, const QgsCoordinateReferenceSystem &destination );
+    static QList< QgsDatumTransform::TransformPair > datumTransformations( const QgsCoordinateReferenceSystem &source, const QgsCoordinateReferenceSystem &destination );
 %Docstring
 Returns a list of datum transformations which are available for the given ``source`` and ``destination`` CRS.
 
@@ -313,61 +284,7 @@ Returns -1 if matching datum ID was not found.
 .. versionadded:: 3.0
 %End
 
-    struct TransformInfo
-    {
-      int datumTransformId;
-%Docstring
-Datum transform ID
-%End
-
-      int epsgCode;
-%Docstring
-EPSG code for the transform, or 0 if not found in EPSG database
-%End
-
-      QString sourceCrsAuthId;
-%Docstring
-Source CRS auth ID
-%End
-
-      QString destinationCrsAuthId;
-%Docstring
-Destination CRS auth ID
-%End
-
-      QString sourceCrsDescription;
-%Docstring
-Source CRS description
-%End
-
-      QString destinationCrsDescription;
-%Docstring
-Destination CRS description
-%End
-
-      QString remarks;
-%Docstring
-Transform remarks
-%End
-
-      QString scope;
-%Docstring
-Scope of transform
-%End
-
-      bool preferred;
-%Docstring
-True if transform is the preferred transform to use for the source/destination CRS combination
-%End
-
-      bool deprecated;
-%Docstring
-True if transform is deprecated
-%End
-
-    };
-
-    static QgsCoordinateTransform::TransformInfo datumTransformInfo( int datumTransformId );
+    static QgsDatumTransform::TransformInfo datumTransformInfo( int datumTransformId );
 %Docstring
 Returns detailed information about the specified ``datumTransformId``.
 If ``datumTransformId`` was not a valid transform ID, a TransformInfo with TransformInfo.datumTransformId of
diff --git a/python/core/qgscoordinatetransformcontext.sip b/python/core/qgscoordinatetransformcontext.sip
index e47e1841c80..c51b0827e38 100644
--- a/python/core/qgscoordinatetransformcontext.sip
+++ b/python/core/qgscoordinatetransformcontext.sip
@@ -65,7 +65,7 @@ Clears all stored transform information from the context.
 
 
 
-    QMap< QPair< QString, QString>, QgsCoordinateTransform::TransformPair > sourceDestinationDatumTransforms() const;
+    QMap< QPair< QString, QString>, QgsDatumTransform::TransformPair > sourceDestinationDatumTransforms() const;
 %Docstring
 Returns the stored mapping for source to destination CRS pairs to associated datum transforms to use.
 The map keys will be QgsCoordinateReferenceSystems.authid()s.
@@ -123,7 +123,7 @@ when transforming from the specified ``source`` CRS to ``destination`` CRS.
    source and destination are reversible.
 %End
 
-    QgsCoordinateTransform::TransformPair calculateDatumTransforms( const QgsCoordinateReferenceSystem &source,
+    QgsDatumTransform::TransformPair calculateDatumTransforms( const QgsCoordinateReferenceSystem &source,
         const QgsCoordinateReferenceSystem &destination ) const;
 %Docstring
 Returns the pair of source and destination datum transforms to use
diff --git a/python/core/qgsdatumtransform.sip b/python/core/qgsdatumtransform.sip
new file mode 100644
index 00000000000..4ffffd34048
--- /dev/null
+++ b/python/core/qgsdatumtransform.sip
@@ -0,0 +1,114 @@
+/************************************************************************
+ * This file has been generated automatically from                      *
+ *                                                                      *
+ * src/core/qgsdatumtransform.h                                         *
+ *                                                                      *
+ * Do not edit manually ! Edit header and run scripts/sipify.pl again   *
+ ************************************************************************/
+
+
+
+class QgsDatumTransform
+{
+%Docstring
+Contains methods and classes relating the datum transformations.
+
+.. versionadded:: 3.0
+%End
+
+%TypeHeaderCode
+#include "qgsdatumtransform.h"
+%End
+  public:
+
+    struct TransformPair
+    {
+
+      TransformPair( int sourceTransformId = -1, int destinationTransformId = -1 );
+%Docstring
+Constructor for a TransformPair with the specified ``sourceTransformId``
+and ``destinationTransformId`` transforms.
+%End
+
+      int sourceTransformId;
+%Docstring
+ID for the datum transform to use when projecting from the source CRS.
+
+.. seealso:: :py:func:`QgsCoordinateTransform.datumTransformCrsInfo()`
+%End
+
+      int destinationTransformId;
+%Docstring
+ID for the datum transform to use when projecting to the destination CRS.
+
+.. seealso:: :py:func:`QgsCoordinateTransform.datumTransformCrsInfo()`
+%End
+
+      bool operator==( const QgsDatumTransform::TransformPair &other ) const;
+
+      bool operator!=( const QgsDatumTransform::TransformPair &other ) const;
+
+    };
+
+    struct TransformInfo
+    {
+      int datumTransformId;
+%Docstring
+Datum transform ID
+%End
+
+      int epsgCode;
+%Docstring
+EPSG code for the transform, or 0 if not found in EPSG database
+%End
+
+      QString sourceCrsAuthId;
+%Docstring
+Source CRS auth ID
+%End
+
+      QString destinationCrsAuthId;
+%Docstring
+Destination CRS auth ID
+%End
+
+      QString sourceCrsDescription;
+%Docstring
+Source CRS description
+%End
+
+      QString destinationCrsDescription;
+%Docstring
+Destination CRS description
+%End
+
+      QString remarks;
+%Docstring
+Transform remarks
+%End
+
+      QString scope;
+%Docstring
+Scope of transform
+%End
+
+      bool preferred;
+%Docstring
+True if transform is the preferred transform to use for the source/destination CRS combination
+%End
+
+      bool deprecated;
+%Docstring
+True if transform is deprecated
+%End
+
+    };
+};
+
+/************************************************************************
+ * This file has been generated automatically from                      *
+ *                                                                      *
+ * src/core/qgsdatumtransform.h                                         *
+ *                                                                      *
+ * Do not edit manually ! Edit header and run scripts/sipify.pl again   *
+ ************************************************************************/
diff --git a/src/app/qgsdatumtransformtablewidget.cpp b/src/app/qgsdatumtransformtablewidget.cpp
index de8a49a7ff2..364c5b68d36 100644
--- a/src/app/qgsdatumtransformtablewidget.cpp
+++ b/src/app/qgsdatumtransformtablewidget.cpp
@@ -85,7 +85,7 @@ QVariant QgsDatumTransformTableModel::data( const QModelIndex &index, int role )
     QPair< QString, QString> crses = mTransformContext.sourceDestinationDatumTransforms().keys().at( index.row() );
     sourceCrs = crses.first;
     destinationCrs = crses.second;
-    const QgsCoordinateTransform::TransformPair transforms = mTransformContext.sourceDestinationDatumTransforms().value( crses );
+    const QgsDatumTransform::TransformPair transforms = mTransformContext.sourceDestinationDatumTransforms().value( crses );
     sourceTransform = transforms.sourceTransformId;
     destinationTransform = transforms.destinationTransformId;
 #ifdef singlesourcedest
diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index 97dac05f6ac..a18fb5c01b8 100755
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -854,7 +854,6 @@ SET(QGIS_CORE_HDRS
   qgscoordinateformatter.h
   qgscoordinatetransform.h
   qgscoordinatetransformcontext.h
-  qgscoordinatetransformcontext_p.h
   qgscoordinateutils.h
   qgsdartmeasurement.h
   qgsdatadefinedsizelegend.h
@@ -862,6 +861,7 @@ SET(QGIS_CORE_HDRS
   qgsdataitemproviderregistry.h
   qgsdatasourceuri.h
   qgsdatetimestatisticalsummary.h
+  qgsdatumtransform.h
   qgsdbfilterproxymodel.h
   qgsdefaultvalue.h
   qgsdiagramrenderer.h
diff --git a/src/core/qgscoordinatetransform.cpp b/src/core/qgscoordinatetransform.cpp
index 7ba55baec8e..78097497efb 100644
--- a/src/core/qgscoordinatetransform.cpp
+++ b/src/core/qgscoordinatetransform.cpp
@@ -691,9 +691,9 @@ const char *finder( const char *name )
 
 
 
-QList< QgsCoordinateTransform::TransformPair > QgsCoordinateTransform::datumTransformations( const QgsCoordinateReferenceSystem &srcCRS, const QgsCoordinateReferenceSystem &destCRS )
+QList< QgsDatumTransform::TransformPair > QgsCoordinateTransform::datumTransformations( const QgsCoordinateReferenceSystem &srcCRS, const QgsCoordinateReferenceSystem &destCRS )
 {
-  QList< QgsCoordinateTransform::TransformPair > transformations;
+  QList< QgsDatumTransform::TransformPair > transformations;
 
   QString srcGeoId = srcCRS.geographicCrsAuthId();
   QString destGeoId = destCRS.geographicCrsAuthId();
@@ -735,20 +735,20 @@ QList< QgsCoordinateTransform::TransformPair > QgsCoordinateTransform::datumTran
   //add direct datum transformations
   for ( int transform : qgis::as_const( directTransforms ) )
   {
-    transformations.push_back( TransformPair( transform, -1 ) );
+    transformations.push_back( QgsDatumTransform::TransformPair( transform, -1 ) );
   }
 
   //add direct datum transformations
   for ( int transform : qgis::as_const( directTransforms ) )
   {
-    transformations.push_back( TransformPair( -1, transform ) );
+    transformations.push_back( QgsDatumTransform::TransformPair( -1, transform ) );
   }
 
   for ( int srcTransform : qgis::as_const( srcToWgs84 ) )
   {
     for ( int destTransform : qgis::as_const( destToWgs84 ) )
     {
-      transformations.push_back( TransformPair( srcTransform, destTransform ) );
+      transformations.push_back( QgsDatumTransform::TransformPair( srcTransform, destTransform ) );
     }
   }
 
@@ -821,9 +821,9 @@ int QgsCoordinateTransform::projStringToDatumTransformId( const QString &string
   return QgsCoordinateTransformPrivate::transformIdFromString( string );
 }
 
-QgsCoordinateTransform::TransformInfo QgsCoordinateTransform::datumTransformInfo( int datumTransform )
+QgsDatumTransform::TransformInfo QgsCoordinateTransform::datumTransformInfo( int datumTransform )
 {
-  TransformInfo info;
+  QgsDatumTransform::TransformInfo info;
 
   sqlite3_database_unique_ptr database;
   int openResult = database.open_v2( QgsApplication::srsDatabaseFilePath(), SQLITE_OPEN_READONLY, nullptr );
diff --git a/src/core/qgscoordinatetransform.h b/src/core/qgscoordinatetransform.h
index 4d2bb70bbf2..54e3db47e21 100644
--- a/src/core/qgscoordinatetransform.h
+++ b/src/core/qgscoordinatetransform.h
@@ -312,52 +312,12 @@ class CORE_EXPORT QgsCoordinateTransform
      */
     bool isShortCircuited() const;
 
-    /**
-     * Contains datum transform information.
-     * \since QGIS 3.0
-     */
-    struct TransformPair
-    {
-
-      /**
-       * Constructor for a TransformPair with the specified \a sourceTransformId
-       * and \a destinationTransformId transforms.
-       */
-      TransformPair( int sourceTransformId = -1, int destinationTransformId = -1 )
-        : sourceTransformId( sourceTransformId )
-        , destinationTransformId( destinationTransformId )
-      {}
-
-      /**
-        * ID for the datum transform to use when projecting from the source CRS.
-        * \see QgsCoordinateTransform::datumTransformCrsInfo()
-       */
-      int sourceTransformId = -1;
-
-      /**
-       * ID for the datum transform to use when projecting to the destination CRS.
-       * \see QgsCoordinateTransform::datumTransformCrsInfo()
-       */
-      int destinationTransformId = -1;
-
-      bool operator==( const QgsCoordinateTransform::TransformPair &other ) const
-      {
-        return other.sourceTransformId == sourceTransformId && other.destinationTransformId == destinationTransformId;
-      }
-
-      bool operator!=( const QgsCoordinateTransform::TransformPair &other ) const
-      {
-        return other.sourceTransformId != sourceTransformId || other.destinationTransformId != destinationTransformId;
-      }
-
-    };
-
     /**
      * Returns a list of datum transformations which are available for the given \a source and \a destination CRS.
      * \see datumTransformToProj()
      * \see datumTransformInfo()
      */
-    static QList< QgsCoordinateTransform::TransformPair > datumTransformations( const QgsCoordinateReferenceSystem &source, const QgsCoordinateReferenceSystem &destination );
+    static QList< QgsDatumTransform::TransformPair > datumTransformations( const QgsCoordinateReferenceSystem &source, const QgsCoordinateReferenceSystem &destination );
 
     /**
      * Returns a proj string representing the specified \a datumTransformId datum transform ID.
@@ -375,44 +335,6 @@ class CORE_EXPORT QgsCoordinateTransform
      */
     static int projStringToDatumTransformId( const QString &string );
 
-    /**
-     * Contains datum transform information.
-     * \since QGIS 3.0
-     */
-    struct TransformInfo
-    {
-      //! Datum transform ID
-      int datumTransformId = -1;
-
-      //! EPSG code for the transform, or 0 if not found in EPSG database
-      int epsgCode = 0;
-
-      //! Source CRS auth ID
-      QString sourceCrsAuthId;
-
-      //! Destination CRS auth ID
-      QString destinationCrsAuthId;
-
-      //! Source CRS description
-      QString sourceCrsDescription;
-
-      //! Destination CRS description
-      QString destinationCrsDescription;
-
-      //! Transform remarks
-      QString remarks;
-
-      //! Scope of transform
-      QString scope;
-
-      //! True if transform is the preferred transform to use for the source/destination CRS combination
-      bool preferred = false;
-
-      //! True if transform is deprecated
-      bool deprecated = false;
-
-    };
-
     /**
      * Returns detailed information about the specified \a datumTransformId.
      * If \a datumTransformId was not a valid transform ID, a TransformInfo with TransformInfo::datumTransformId of
@@ -420,7 +342,7 @@ class CORE_EXPORT QgsCoordinateTransform
      * \see datumTransformations()
      * \see datumTransformToProj()
     */
-    static QgsCoordinateTransform::TransformInfo datumTransformInfo( int datumTransformId );
+    static QgsDatumTransform::TransformInfo datumTransformInfo( int datumTransformId );
 
     /**
      * Returns the ID of the datum transform to use when projecting from the source
diff --git a/src/core/qgscoordinatetransform_p.cpp b/src/core/qgscoordinatetransform_p.cpp
index 1f5fee3cf81..436921907c1 100644
--- a/src/core/qgscoordinatetransform_p.cpp
+++ b/src/core/qgscoordinatetransform_p.cpp
@@ -217,10 +217,10 @@ bool QgsCoordinateTransformPrivate::initialize()
   return mIsValid;
 }
 
-void QgsCoordinateTransformPrivate::calculateTransforms()
+void QgsCoordinateTransformPrivate::calculateTransforms( const QgsCoordinateTransformContext &context )
 {
   // recalculate datum transforms from context
-  QgsCoordinateTransform::TransformPair transforms = mContext.calculateDatumTransforms( mSourceCRS, mDestCRS );
+  QgsDatumTransform::TransformPair transforms = context.calculateDatumTransforms( mSourceCRS, mDestCRS );
   mSourceDatumTransform = transforms.sourceTransformId;
   mDestinationDatumTransform = transforms.destinationTransformId;
 }
diff --git a/src/core/qgscoordinatetransformcontext.cpp b/src/core/qgscoordinatetransformcontext.cpp
index 91e0eca0a7b..e26e2276c8c 100644
--- a/src/core/qgscoordinatetransformcontext.cpp
+++ b/src/core/qgscoordinatetransformcontext.cpp
@@ -102,7 +102,7 @@ void QgsCoordinateTransformContext::removeDestinationDatumTransform( const QgsCo
 
 #endif
 
-QMap<QPair<QString, QString>, QgsCoordinateTransform::TransformPair> QgsCoordinateTransformContext::sourceDestinationDatumTransforms() const
+QMap<QPair<QString, QString>, QgsDatumTransform::TransformPair> QgsCoordinateTransformContext::sourceDestinationDatumTransforms() const
 {
   d->mLock.lockForRead();
   auto res = d->mSourceDestDatumTransforms;
@@ -118,7 +118,7 @@ bool QgsCoordinateTransformContext::addSourceDestinationDatumTransform( const Qg
 
   d.detach();
   d->mLock.lockForWrite();
-  d->mSourceDestDatumTransforms.insert( qMakePair( sourceCrs.authid(), destinationCrs.authid() ), QgsCoordinateTransform::TransformPair( sourceTransform, destinationTransform ) );
+  d->mSourceDestDatumTransforms.insert( qMakePair( sourceCrs.authid(), destinationCrs.authid() ), QgsDatumTransform::TransformPair( sourceTransform, destinationTransform ) );
   d->mLock.unlock();
   return true;
 }
@@ -130,24 +130,24 @@ void QgsCoordinateTransformContext::removeSourceDestinationDatumTransform( const
 
 bool QgsCoordinateTransformContext::hasTransform( const QgsCoordinateReferenceSystem &source, const QgsCoordinateReferenceSystem &destination ) const
 {
-  QgsCoordinateTransform::TransformPair t = calculateDatumTransforms( source, destination );
+  QgsDatumTransform::TransformPair t = calculateDatumTransforms( source, destination );
   // calculateDatumTransforms already takes care of switching source and destination
   return t.sourceTransformId != -1 || t.destinationTransformId != -1;
 }
 
-QgsCoordinateTransform::TransformPair QgsCoordinateTransformContext::calculateDatumTransforms( const QgsCoordinateReferenceSystem &source, const QgsCoordinateReferenceSystem &destination ) const
+QgsDatumTransform::TransformPair QgsCoordinateTransformContext::calculateDatumTransforms( const QgsCoordinateReferenceSystem &source, const QgsCoordinateReferenceSystem &destination ) const
 {
   QString srcKey = source.authid();
   QString destKey = destination.authid();
 
   d->mLock.lockForRead();
   // highest priority is exact match for source/dest pair
-  QgsCoordinateTransform::TransformPair res = d->mSourceDestDatumTransforms.value( qMakePair( srcKey, destKey ), QgsCoordinateTransform::TransformPair( -1, -1 ) );
+  QgsDatumTransform::TransformPair res = d->mSourceDestDatumTransforms.value( qMakePair( srcKey, destKey ), QgsDatumTransform::TransformPair( -1, -1 ) );
   if ( res.sourceTransformId == -1 && res.destinationTransformId == -1 )
   {
     // try to reverse
-    QgsCoordinateTransform::TransformPair res2 = d->mSourceDestDatumTransforms.value( qMakePair( destKey, srcKey ), QgsCoordinateTransform::TransformPair( -1, -1 ) );
-    res = QgsCoordinateTransform::TransformPair( res2.destinationTransformId, res2.sourceTransformId );
+    QgsDatumTransform::TransformPair res2 = d->mSourceDestDatumTransforms.value( qMakePair( destKey, srcKey ), QgsDatumTransform::TransformPair( -1, -1 ) );
+    res = QgsDatumTransform::TransformPair( res2.destinationTransformId, res2.sourceTransformId );
   }
   d->mLock.unlock();
   return res;
@@ -217,7 +217,7 @@ bool QgsCoordinateTransformContext::readXml( const QDomElement &element, const Q
       }
     }
 
-    d->mSourceDestDatumTransforms.insert( qMakePair( key1, key2 ), QgsCoordinateTransform::TransformPair( datumId1, datumId2 ) );
+    d->mSourceDestDatumTransforms.insert( qMakePair( key1, key2 ), QgsDatumTransform::TransformPair( datumId1, datumId2 ) );
   }
 
 #if 0
@@ -347,7 +347,7 @@ void QgsCoordinateTransformContext::readSettings()
   QMap< QPair< QString, QString >, QPair< int, int > >::const_iterator transformIt = transforms.constBegin();
   for ( ; transformIt != transforms.constEnd(); ++transformIt )
   {
-    d->mSourceDestDatumTransforms.insert( transformIt.key(), QgsCoordinateTransform::TransformPair( transformIt.value().first, transformIt.value().second ) );
+    d->mSourceDestDatumTransforms.insert( transformIt.key(), QgsDatumTransform::TransformPair( transformIt.value().first, transformIt.value().second ) );
   }
 
   d->mLock.unlock();
diff --git a/src/core/qgscoordinatetransformcontext.h b/src/core/qgscoordinatetransformcontext.h
index 6d8dbdeabf7..24b4e4f5c3d 100644
--- a/src/core/qgscoordinatetransformcontext.h
+++ b/src/core/qgscoordinatetransformcontext.h
@@ -21,7 +21,7 @@
 #include "qgis_core.h"
 #include "qgis.h"
 #include "qgscoordinatetransformcontext_p.h"
-#include "qgscoordinatetransform.h"
+#include "qgsdatumtransform.h"
 
 class QgsReadWriteContext;
 
@@ -181,7 +181,7 @@ class CORE_EXPORT QgsCoordinateTransformContext
      *
      * \see addSourceDestinationDatumTransform()
      */
-    QMap< QPair< QString, QString>, QgsCoordinateTransform::TransformPair > sourceDestinationDatumTransforms() const;
+    QMap< QPair< QString, QString>, QgsDatumTransform::TransformPair > sourceDestinationDatumTransforms() const;
 
     /**
      * Adds a new \a sourceTransform and \a destinationTransform to use when projecting coordinates
@@ -228,7 +228,7 @@ class CORE_EXPORT QgsCoordinateTransformContext
      *
      * \note source and destination are reversible.
      */
-    QgsCoordinateTransform::TransformPair calculateDatumTransforms( const QgsCoordinateReferenceSystem &source,
+    QgsDatumTransform::TransformPair calculateDatumTransforms( const QgsCoordinateReferenceSystem &source,
         const QgsCoordinateReferenceSystem &destination ) const;
 
     /**
diff --git a/src/core/qgscoordinatetransformcontext_p.h b/src/core/qgscoordinatetransformcontext_p.h
index ba45c02ade9..b37d1208d12 100644
--- a/src/core/qgscoordinatetransformcontext_p.h
+++ b/src/core/qgscoordinatetransformcontext_p.h
@@ -38,7 +38,7 @@
 #define SIP_NO_FILE
 
 #include "qgscoordinatereferencesystem.h"
-#include "qgscoordinatetransform.h"
+#include "qgsdatumtransform.h"
 
 class QgsCoordinateTransformContextPrivate : public QSharedData
 {
@@ -63,7 +63,7 @@ class QgsCoordinateTransformContextPrivate : public QSharedData
      * Mapping for datum transforms to use for source/destination CRS pairs.
      * Matching records from this map will take precedence over other transform maps.
      */
-    QMap< QPair< QString, QString >, QgsCoordinateTransform::TransformPair > mSourceDestDatumTransforms;
+    QMap< QPair< QString, QString >, QgsDatumTransform::TransformPair > mSourceDestDatumTransforms;
 
 #if 0
     //! Mapping for datum transforms to use for source CRS
diff --git a/src/core/qgsdatumtransform.h b/src/core/qgsdatumtransform.h
new file mode 100644
index 00000000000..cefa4a044d6
--- /dev/null
+++ b/src/core/qgsdatumtransform.h
@@ -0,0 +1,112 @@
+/***************************************************************************
+               qgsdatumtransform.h
+               ------------------------
+    begin                : Dec 2017
+    copyright            : (C) 2017 Nyall Dawson
+    email                : nyall dot dawson at gmail dot com
+ ***************************************************************************/
+
+/***************************************************************************
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ ***************************************************************************/
+#ifndef QGSDATUMTRANSFORM_H
+#define QGSDATUMTRANSFORM_H
+
+#include "qgis_core.h"
+#include <QString>
+
+/**
+ * Contains methods and classes relating the datum transformations.
+ * \ingroup core
+ * \since QGIS 3.0
+ */
+class CORE_EXPORT QgsDatumTransform
+{
+
+  public:
+
+    /**
+     * Contains datum transform information.
+     * \since QGIS 3.0
+     */
+    struct TransformPair
+    {
+
+      /**
+       * Constructor for a TransformPair with the specified \a sourceTransformId
+       * and \a destinationTransformId transforms.
+       */
+      TransformPair( int sourceTransformId = -1, int destinationTransformId = -1 )
+        : sourceTransformId( sourceTransformId )
+        , destinationTransformId( destinationTransformId )
+      {}
+
+      /**
+        * ID for the datum transform to use when projecting from the source CRS.
+        * \see QgsCoordinateTransform::datumTransformCrsInfo()
+       */
+      int sourceTransformId = -1;
+
+      /**
+       * ID for the datum transform to use when projecting to the destination CRS.
+       * \see QgsCoordinateTransform::datumTransformCrsInfo()
+       */
+      int destinationTransformId = -1;
+
+      bool operator==( const QgsDatumTransform::TransformPair &other ) const
+      {
+        return other.sourceTransformId == sourceTransformId && other.destinationTransformId == destinationTransformId;
+      }
+
+      bool operator!=( const QgsDatumTransform::TransformPair &other ) const
+      {
+        return other.sourceTransformId != sourceTransformId || other.destinationTransformId != destinationTransformId;
+      }
+
+    };
+
+    /**
+     * Contains datum transform information.
+     * \since QGIS 3.0
+     */
+    struct TransformInfo
+    {
+      //! Datum transform ID
+      int datumTransformId = -1;
+
+      //! EPSG code for the transform, or 0 if not found in EPSG database
+      int epsgCode = 0;
+
+      //! Source CRS auth ID
+      QString sourceCrsAuthId;
+
+      //! Destination CRS auth ID
+      QString destinationCrsAuthId;
+
+      //! Source CRS description
+      QString sourceCrsDescription;
+
+      //! Destination CRS description
+      QString destinationCrsDescription;
+
+      //! Transform remarks
+      QString remarks;
+
+      //! Scope of transform
+      QString scope;
+
+      //! True if transform is the preferred transform to use for the source/destination CRS combination
+      bool preferred = false;
+
+      //! True if transform is deprecated
+      bool deprecated = false;
+
+    };
+};
+
+#endif // QGSDATUMTRANSFORM_H
diff --git a/src/gui/qgsdatumtransformdialog.cpp b/src/gui/qgsdatumtransformdialog.cpp
index 6df20b8b14f..709cf6f364b 100644
--- a/src/gui/qgsdatumtransformdialog.cpp
+++ b/src/gui/qgsdatumtransformdialog.cpp
@@ -71,7 +71,7 @@ void QgsDatumTransformDialog::load( const QPair<int, int> &selectedDatumTransfor
 {
   mDatumTransformTreeWidget->clear();
 
-  for ( const QgsCoordinateTransform::TransformPair &transform : qgis::as_const( mDatumTransforms ) )
+  for ( const QgsDatumTransform::TransformPair &transform : qgis::as_const( mDatumTransforms ) )
   {
     QTreeWidgetItem *item = new QTreeWidgetItem();
     bool itemDisabled = false;
@@ -87,7 +87,7 @@ void QgsDatumTransformDialog::load( const QPair<int, int> &selectedDatumTransfor
       item->setText( i, QgsCoordinateTransform::datumTransformToProj( nr ) );
 
       //Describe datums in a tooltip
-      QgsCoordinateTransform::TransformInfo info = QgsCoordinateTransform::datumTransformInfo( nr );
+      QgsDatumTransform::TransformInfo info = QgsCoordinateTransform::datumTransformInfo( nr );
       if ( info.datumTransformId == -1 )
         continue;
 
diff --git a/src/gui/qgsdatumtransformdialog.h b/src/gui/qgsdatumtransformdialog.h
index 8ed5d423a47..6d8480ea7ee 100644
--- a/src/gui/qgsdatumtransformdialog.h
+++ b/src/gui/qgsdatumtransformdialog.h
@@ -71,7 +71,7 @@ class GUI_EXPORT QgsDatumTransformDialog : public QDialog, private Ui::QgsDatumT
     void setOKButtonEnabled();
 
 
-    QList< QgsCoordinateTransform::TransformPair > mDatumTransforms;
+    QList< QgsDatumTransform::TransformPair > mDatumTransforms;
     QgsCoordinateReferenceSystem mSourceCrs;
     QgsCoordinateReferenceSystem mDestinationCrs;
 };
diff --git a/tests/src/core/testqgscoordinatetransform.cpp b/tests/src/core/testqgscoordinatetransform.cpp
index 6c2d126ed25..056842bc434 100644
--- a/tests/src/core/testqgscoordinatetransform.cpp
+++ b/tests/src/core/testqgscoordinatetransform.cpp
@@ -188,8 +188,8 @@ void TestQgsCoordinateTransform::contextShared()
   original.addSourceDestinationDatumTransform( QgsCoordinateReferenceSystem( 3111 ), QgsCoordinateReferenceSystem( 3113 ), 1, 2 );
 
   QgsCoordinateTransformContext copy( original );
-  QMap< QPair< QString, QString >, QgsCoordinateTransform::TransformPair > expected;
-  expected.insert( qMakePair( QStringLiteral( "EPSG:3111" ), QStringLiteral( "EPSG:3113" ) ), QgsCoordinateTransform::TransformPair( 1, 2 ) );
+  QMap< QPair< QString, QString >, QgsDatumTransform::TransformPair > expected;
+  expected.insert( qMakePair( QStringLiteral( "EPSG:3111" ), QStringLiteral( "EPSG:3113" ) ), QgsDatumTransform::TransformPair( 1, 2 ) );
   QCOMPARE( original.sourceDestinationDatumTransforms(), expected );
   QCOMPARE( copy.sourceDestinationDatumTransforms(), expected );
 
@@ -197,19 +197,19 @@ void TestQgsCoordinateTransform::contextShared()
   copy.addSourceDestinationDatumTransform( QgsCoordinateReferenceSystem( 3111 ), QgsCoordinateReferenceSystem( 3113 ), 3, 4 );
   QCOMPARE( original.sourceDestinationDatumTransforms(), expected );
 
-  expected.insert( qMakePair( QStringLiteral( "EPSG:3111" ), QStringLiteral( "EPSG:3113" ) ), QgsCoordinateTransform::TransformPair( 3, 4 ) );
+  expected.insert( qMakePair( QStringLiteral( "EPSG:3111" ), QStringLiteral( "EPSG:3113" ) ), QgsDatumTransform::TransformPair( 3, 4 ) );
   QCOMPARE( copy.sourceDestinationDatumTransforms(), expected );
 
   // copy via assignment
   QgsCoordinateTransformContext copy2;
   copy2 = original;
-  expected.insert( qMakePair( QStringLiteral( "EPSG:3111" ), QStringLiteral( "EPSG:3113" ) ), QgsCoordinateTransform::TransformPair( 1, 2 ) );
+  expected.insert( qMakePair( QStringLiteral( "EPSG:3111" ), QStringLiteral( "EPSG:3113" ) ), QgsDatumTransform::TransformPair( 1, 2 ) );
   QCOMPARE( original.sourceDestinationDatumTransforms(), expected );
   QCOMPARE( copy2.sourceDestinationDatumTransforms(), expected );
 
   copy2.addSourceDestinationDatumTransform( QgsCoordinateReferenceSystem( 3111 ), QgsCoordinateReferenceSystem( 3113 ), 3, 4 );
   QCOMPARE( original.sourceDestinationDatumTransforms(), expected );
-  expected.insert( qMakePair( QStringLiteral( "EPSG:3111" ), QStringLiteral( "EPSG:3113" ) ), QgsCoordinateTransform::TransformPair( 3, 4 ) );
+  expected.insert( qMakePair( QStringLiteral( "EPSG:3111" ), QStringLiteral( "EPSG:3113" ) ), QgsDatumTransform::TransformPair( 3, 4 ) );
   QCOMPARE( copy2.sourceDestinationDatumTransforms(), expected );
 }
 
diff --git a/tests/src/python/test_qgscoordinatetransformcontext.py b/tests/src/python/test_qgscoordinatetransformcontext.py
index b25d058e767..71848e8a803 100644
--- a/tests/src/python/test_qgscoordinatetransformcontext.py
+++ b/tests/src/python/test_qgscoordinatetransformcontext.py
@@ -17,6 +17,7 @@ import qgis  # NOQA
 from qgis.core import (QgsCoordinateReferenceSystem,
                        QgsCoordinateTransformContext,
                        QgsCoordinateTransform,
+                       QgsDatumTransform,
                        QgsReadWriteContext,
                        QgsProject,
                        QgsSettings)
@@ -114,79 +115,79 @@ class TestQgsCoordinateTransformContext(unittest.TestCase):
             context.hasTransform(QgsCoordinateReferenceSystem('EPSG:3111'), QgsCoordinateReferenceSystem('EPSG:4326')))
         self.assertFalse(
             context.hasTransform(QgsCoordinateReferenceSystem('EPSG:3113'), QgsCoordinateReferenceSystem('EPSG:4283')))
-        self.assertEqual(context.sourceDestinationDatumTransforms(), {('EPSG:3111', 'EPSG:4283'): QgsCoordinateTransform.TransformPair(1, 2)})
+        self.assertEqual(context.sourceDestinationDatumTransforms(), {('EPSG:3111', 'EPSG:4283'): QgsDatumTransform.TransformPair(1, 2)})
         self.assertTrue(context.addSourceDestinationDatumTransform(QgsCoordinateReferenceSystem('EPSG:28356'),
                                                                    QgsCoordinateReferenceSystem(4283), 3, 4))
-        self.assertEqual(context.sourceDestinationDatumTransforms(), {('EPSG:3111', 'EPSG:4283'): QgsCoordinateTransform.TransformPair(1, 2),
-                                                                      ('EPSG:28356', 'EPSG:4283'): QgsCoordinateTransform.TransformPair(3, 4)})
+        self.assertEqual(context.sourceDestinationDatumTransforms(), {('EPSG:3111', 'EPSG:4283'): QgsDatumTransform.TransformPair(1, 2),
+                                                                      ('EPSG:28356', 'EPSG:4283'): QgsDatumTransform.TransformPair(3, 4)})
         self.assertTrue(context.addSourceDestinationDatumTransform(QgsCoordinateReferenceSystem('EPSG:28356'),
                                                                    QgsCoordinateReferenceSystem(28357), 7, 8))
-        self.assertEqual(context.sourceDestinationDatumTransforms(), {('EPSG:3111', 'EPSG:4283'): QgsCoordinateTransform.TransformPair(1, 2),
-                                                                      ('EPSG:28356', 'EPSG:4283'): QgsCoordinateTransform.TransformPair(3, 4),
-                                                                      ('EPSG:28356', 'EPSG:28357'): QgsCoordinateTransform.TransformPair(7, 8)})
+        self.assertEqual(context.sourceDestinationDatumTransforms(), {('EPSG:3111', 'EPSG:4283'): QgsDatumTransform.TransformPair(1, 2),
+                                                                      ('EPSG:28356', 'EPSG:4283'): QgsDatumTransform.TransformPair(3, 4),
+                                                                      ('EPSG:28356', 'EPSG:28357'): QgsDatumTransform.TransformPair(7, 8)})
         self.assertTrue(context.addSourceDestinationDatumTransform(QgsCoordinateReferenceSystem('EPSG:28356'),
                                                                    QgsCoordinateReferenceSystem('EPSG:28357'), 9, 11))
-        self.assertEqual(context.sourceDestinationDatumTransforms(), {('EPSG:3111', 'EPSG:4283'): QgsCoordinateTransform.TransformPair(1, 2),
-                                                                      ('EPSG:28356', 'EPSG:4283'): QgsCoordinateTransform.TransformPair(3, 4),
-                                                                      ('EPSG:28356', 'EPSG:28357'): QgsCoordinateTransform.TransformPair(9, 11)})
+        self.assertEqual(context.sourceDestinationDatumTransforms(), {('EPSG:3111', 'EPSG:4283'): QgsDatumTransform.TransformPair(1, 2),
+                                                                      ('EPSG:28356', 'EPSG:4283'): QgsDatumTransform.TransformPair(3, 4),
+                                                                      ('EPSG:28356', 'EPSG:28357'): QgsDatumTransform.TransformPair(9, 11)})
 
         # invalid additions
         self.assertFalse(context.addSourceDestinationDatumTransform(QgsCoordinateReferenceSystem(),
                                                                     QgsCoordinateReferenceSystem('EPSG:28357'), 9, 11))
-        self.assertEqual(context.sourceDestinationDatumTransforms(), {('EPSG:3111', 'EPSG:4283'): QgsCoordinateTransform.TransformPair(1, 2),
-                                                                      ('EPSG:28356', 'EPSG:4283'): QgsCoordinateTransform.TransformPair(3, 4),
-                                                                      ('EPSG:28356', 'EPSG:28357'): QgsCoordinateTransform.TransformPair(9, 11)})
+        self.assertEqual(context.sourceDestinationDatumTransforms(), {('EPSG:3111', 'EPSG:4283'): QgsDatumTransform.TransformPair(1, 2),
+                                                                      ('EPSG:28356', 'EPSG:4283'): QgsDatumTransform.TransformPair(3, 4),
+                                                                      ('EPSG:28356', 'EPSG:28357'): QgsDatumTransform.TransformPair(9, 11)})
         self.assertFalse(context.addSourceDestinationDatumTransform(QgsCoordinateReferenceSystem('EPSG:3111'),
                                                                     QgsCoordinateReferenceSystem(), 9, 11))
-        self.assertEqual(context.sourceDestinationDatumTransforms(), {('EPSG:3111', 'EPSG:4283'): QgsCoordinateTransform.TransformPair(1, 2),
-                                                                      ('EPSG:28356', 'EPSG:4283'): QgsCoordinateTransform.TransformPair(3, 4),
-                                                                      ('EPSG:28356', 'EPSG:28357'): QgsCoordinateTransform.TransformPair(9, 11)})
+        self.assertEqual(context.sourceDestinationDatumTransforms(), {('EPSG:3111', 'EPSG:4283'): QgsDatumTransform.TransformPair(1, 2),
+                                                                      ('EPSG:28356', 'EPSG:4283'): QgsDatumTransform.TransformPair(3, 4),
+                                                                      ('EPSG:28356', 'EPSG:28357'): QgsDatumTransform.TransformPair(9, 11)})
 
         # indicate no transform required
         self.assertTrue(context.addSourceDestinationDatumTransform(QgsCoordinateReferenceSystem(28357),
                                                                    QgsCoordinateReferenceSystem(28356), -1, -1))
-        self.assertEqual(context.sourceDestinationDatumTransforms(), {('EPSG:3111', 'EPSG:4283'): QgsCoordinateTransform.TransformPair(1, 2),
-                                                                      ('EPSG:28356', 'EPSG:4283'): QgsCoordinateTransform.TransformPair(3, 4),
-                                                                      ('EPSG:28356', 'EPSG:28357'): QgsCoordinateTransform.TransformPair(9, 11),
-                                                                      ('EPSG:28357', 'EPSG:28356'): QgsCoordinateTransform.TransformPair(-1, -1)})
+        self.assertEqual(context.sourceDestinationDatumTransforms(), {('EPSG:3111', 'EPSG:4283'): QgsDatumTransform.TransformPair(1, 2),
+                                                                      ('EPSG:28356', 'EPSG:4283'): QgsDatumTransform.TransformPair(3, 4),
+                                                                      ('EPSG:28356', 'EPSG:28357'): QgsDatumTransform.TransformPair(9, 11),
+                                                                      ('EPSG:28357', 'EPSG:28356'): QgsDatumTransform.TransformPair(-1, -1)})
         self.assertTrue(context.addSourceDestinationDatumTransform(QgsCoordinateReferenceSystem(3111),
                                                                    QgsCoordinateReferenceSystem(28356), 17, -1))
-        self.assertEqual(context.sourceDestinationDatumTransforms(), {('EPSG:3111', 'EPSG:4283'): QgsCoordinateTransform.TransformPair(1, 2),
-                                                                      ('EPSG:28356', 'EPSG:4283'): QgsCoordinateTransform.TransformPair(3, 4),
-                                                                      ('EPSG:28356', 'EPSG:28357'): QgsCoordinateTransform.TransformPair(9, 11),
-                                                                      ('EPSG:28357', 'EPSG:28356'): QgsCoordinateTransform.TransformPair(-1, -1),
-                                                                      ('EPSG:3111', 'EPSG:28356'): QgsCoordinateTransform.TransformPair(17, -1)})
+        self.assertEqual(context.sourceDestinationDatumTransforms(), {('EPSG:3111', 'EPSG:4283'): QgsDatumTransform.TransformPair(1, 2),
+                                                                      ('EPSG:28356', 'EPSG:4283'): QgsDatumTransform.TransformPair(3, 4),
+                                                                      ('EPSG:28356', 'EPSG:28357'): QgsDatumTransform.TransformPair(9, 11),
+                                                                      ('EPSG:28357', 'EPSG:28356'): QgsDatumTransform.TransformPair(-1, -1),
+                                                                      ('EPSG:3111', 'EPSG:28356'): QgsDatumTransform.TransformPair(17, -1)})
         self.assertTrue(context.addSourceDestinationDatumTransform(QgsCoordinateReferenceSystem(3113),
                                                                    QgsCoordinateReferenceSystem(28356), -1, 18))
-        self.assertEqual(context.sourceDestinationDatumTransforms(), {('EPSG:3111', 'EPSG:4283'): QgsCoordinateTransform.TransformPair(1, 2),
-                                                                      ('EPSG:28356', 'EPSG:4283'): QgsCoordinateTransform.TransformPair(3, 4),
-                                                                      ('EPSG:28356', 'EPSG:28357'): QgsCoordinateTransform.TransformPair(9, 11),
-                                                                      ('EPSG:28357', 'EPSG:28356'): QgsCoordinateTransform.TransformPair(-1, -1),
-                                                                      ('EPSG:3111', 'EPSG:28356'): QgsCoordinateTransform.TransformPair(17, -1),
-                                                                      ('EPSG:3113', 'EPSG:28356'): QgsCoordinateTransform.TransformPair(-1, 18)})
+        self.assertEqual(context.sourceDestinationDatumTransforms(), {('EPSG:3111', 'EPSG:4283'): QgsDatumTransform.TransformPair(1, 2),
+                                                                      ('EPSG:28356', 'EPSG:4283'): QgsDatumTransform.TransformPair(3, 4),
+                                                                      ('EPSG:28356', 'EPSG:28357'): QgsDatumTransform.TransformPair(9, 11),
+                                                                      ('EPSG:28357', 'EPSG:28356'): QgsDatumTransform.TransformPair(-1, -1),
+                                                                      ('EPSG:3111', 'EPSG:28356'): QgsDatumTransform.TransformPair(17, -1),
+                                                                      ('EPSG:3113', 'EPSG:28356'): QgsDatumTransform.TransformPair(-1, 18)})
         # remove non-existing
         context.removeSourceDestinationDatumTransform(QgsCoordinateReferenceSystem(3113), QgsCoordinateReferenceSystem(3111))
-        self.assertEqual(context.sourceDestinationDatumTransforms(), {('EPSG:3111', 'EPSG:4283'): QgsCoordinateTransform.TransformPair(1, 2),
-                                                                      ('EPSG:28356', 'EPSG:4283'): QgsCoordinateTransform.TransformPair(3, 4),
-                                                                      ('EPSG:28356', 'EPSG:28357'): QgsCoordinateTransform.TransformPair(9, 11),
-                                                                      ('EPSG:28357', 'EPSG:28356'): QgsCoordinateTransform.TransformPair(-1, -1),
-                                                                      ('EPSG:3111', 'EPSG:28356'): QgsCoordinateTransform.TransformPair(17, -1),
-                                                                      ('EPSG:3113', 'EPSG:28356'): QgsCoordinateTransform.TransformPair(-1, 18)})
+        self.assertEqual(context.sourceDestinationDatumTransforms(), {('EPSG:3111', 'EPSG:4283'): QgsDatumTransform.TransformPair(1, 2),
+                                                                      ('EPSG:28356', 'EPSG:4283'): QgsDatumTransform.TransformPair(3, 4),
+                                                                      ('EPSG:28356', 'EPSG:28357'): QgsDatumTransform.TransformPair(9, 11),
+                                                                      ('EPSG:28357', 'EPSG:28356'): QgsDatumTransform.TransformPair(-1, -1),
+                                                                      ('EPSG:3111', 'EPSG:28356'): QgsDatumTransform.TransformPair(17, -1),
+                                                                      ('EPSG:3113', 'EPSG:28356'): QgsDatumTransform.TransformPair(-1, 18)})
 
         # remove existing
         context.removeSourceDestinationDatumTransform(QgsCoordinateReferenceSystem(3111),
                                                       QgsCoordinateReferenceSystem(4283))
-        self.assertEqual(context.sourceDestinationDatumTransforms(), {('EPSG:28356', 'EPSG:4283'): QgsCoordinateTransform.TransformPair(3, 4),
-                                                                      ('EPSG:28356', 'EPSG:28357'): QgsCoordinateTransform.TransformPair(9, 11),
-                                                                      ('EPSG:28357', 'EPSG:28356'): QgsCoordinateTransform.TransformPair(-1, -1),
-                                                                      ('EPSG:3111', 'EPSG:28356'): QgsCoordinateTransform.TransformPair(17, -1),
-                                                                      ('EPSG:3113', 'EPSG:28356'): QgsCoordinateTransform.TransformPair(-1, 18)})
+        self.assertEqual(context.sourceDestinationDatumTransforms(), {('EPSG:28356', 'EPSG:4283'): QgsDatumTransform.TransformPair(3, 4),
+                                                                      ('EPSG:28356', 'EPSG:28357'): QgsDatumTransform.TransformPair(9, 11),
+                                                                      ('EPSG:28357', 'EPSG:28356'): QgsDatumTransform.TransformPair(-1, -1),
+                                                                      ('EPSG:3111', 'EPSG:28356'): QgsDatumTransform.TransformPair(17, -1),
+                                                                      ('EPSG:3113', 'EPSG:28356'): QgsDatumTransform.TransformPair(-1, 18)})
         context.removeSourceDestinationDatumTransform(QgsCoordinateReferenceSystem(3111),
                                                       QgsCoordinateReferenceSystem(28356))
-        self.assertEqual(context.sourceDestinationDatumTransforms(), {('EPSG:28356', 'EPSG:4283'): QgsCoordinateTransform.TransformPair(3, 4),
-                                                                      ('EPSG:28356', 'EPSG:28357'): QgsCoordinateTransform.TransformPair(9, 11),
-                                                                      ('EPSG:28357', 'EPSG:28356'): QgsCoordinateTransform.TransformPair(-1, -1),
-                                                                      ('EPSG:3113', 'EPSG:28356'): QgsCoordinateTransform.TransformPair(-1, 18)})
+        self.assertEqual(context.sourceDestinationDatumTransforms(), {('EPSG:28356', 'EPSG:4283'): QgsDatumTransform.TransformPair(3, 4),
+                                                                      ('EPSG:28356', 'EPSG:28357'): QgsDatumTransform.TransformPair(9, 11),
+                                                                      ('EPSG:28357', 'EPSG:28356'): QgsDatumTransform.TransformPair(-1, -1),
+                                                                      ('EPSG:3113', 'EPSG:28356'): QgsDatumTransform.TransformPair(-1, 18)})
 
         context.clear()
         self.assertEqual(context.sourceDestinationDatumTransforms(), {})
@@ -244,7 +245,7 @@ class TestQgsCoordinateTransformContext(unittest.TestCase):
         #empty context
         self.assertEqual(context.calculateDatumTransforms(QgsCoordinateReferenceSystem('EPSG:3111'),
                                                           QgsCoordinateReferenceSystem('EPSG:4283')),
-                         QgsCoordinateTransform.TransformPair(-1, -1))
+                         QgsDatumTransform.TransformPair(-1, -1))
 
         #add specific source/dest pair - should take precedence
         context.addSourceDestinationDatumTransform(QgsCoordinateReferenceSystem('EPSG:28356'),
@@ -252,17 +253,17 @@ class TestQgsCoordinateTransformContext(unittest.TestCase):
                                                    3, 4)
         self.assertEqual(context.calculateDatumTransforms(QgsCoordinateReferenceSystem('EPSG:28356'),
                                                           QgsCoordinateReferenceSystem('EPSG:4283')),
-                         QgsCoordinateTransform.TransformPair(3, 4))
+                         QgsDatumTransform.TransformPair(3, 4))
         self.assertEqual(context.calculateDatumTransforms(QgsCoordinateReferenceSystem('EPSG:3111'),
                                                           QgsCoordinateReferenceSystem('EPSG:4283')),
-                         QgsCoordinateTransform.TransformPair(-1, -1))
+                         QgsDatumTransform.TransformPair(-1, -1))
         self.assertEqual(context.calculateDatumTransforms(QgsCoordinateReferenceSystem('EPSG:28356'),
                                                           QgsCoordinateReferenceSystem('EPSG:3111')),
-                         QgsCoordinateTransform.TransformPair(-1, -1))
+                         QgsDatumTransform.TransformPair(-1, -1))
         # check that reverse transforms are automatically supported
         self.assertEqual(context.calculateDatumTransforms(QgsCoordinateReferenceSystem('EPSG:4283'),
                                                           QgsCoordinateReferenceSystem('EPSG:28356')),
-                         QgsCoordinateTransform.TransformPair(4, 3))
+                         QgsDatumTransform.TransformPair(4, 3))
 
     @unittest.skip('ifdefed out in c++ until required')
     def testWriteReadXmlSingleVariant(self):
@@ -316,8 +317,8 @@ class TestQgsCoordinateTransformContext(unittest.TestCase):
         self.assertTrue(context.addSourceDestinationDatumTransform(QgsCoordinateReferenceSystem(4205),
                                                                    QgsCoordinateReferenceSystem(4326), source_id_2, dest_id_2))
 
-        self.assertEqual(context.sourceDestinationDatumTransforms(), {('EPSG:4204', 'EPSG:4326'): QgsCoordinateTransform.TransformPair(source_id_1, dest_id_1),
-                                                                      ('EPSG:4205', 'EPSG:4326'): QgsCoordinateTransform.TransformPair(source_id_2, dest_id_2)})
+        self.assertEqual(context.sourceDestinationDatumTransforms(), {('EPSG:4204', 'EPSG:4326'): QgsDatumTransform.TransformPair(source_id_1, dest_id_1),
+                                                                      ('EPSG:4205', 'EPSG:4326'): QgsDatumTransform.TransformPair(source_id_2, dest_id_2)})
 
         # save to xml
         doc = QDomDocument("testdoc")
@@ -329,8 +330,8 @@ class TestQgsCoordinateTransformContext(unittest.TestCase):
         context2.readXml(elem, QgsReadWriteContext())
 
         # check result
-        self.assertEqual(context2.sourceDestinationDatumTransforms(), {('EPSG:4204', 'EPSG:4326'): QgsCoordinateTransform.TransformPair(source_id_1, dest_id_1),
-                                                                       ('EPSG:4205', 'EPSG:4326'): QgsCoordinateTransform.TransformPair(source_id_2, dest_id_2)})
+        self.assertEqual(context2.sourceDestinationDatumTransforms(), {('EPSG:4204', 'EPSG:4326'): QgsDatumTransform.TransformPair(source_id_1, dest_id_1),
+                                                                       ('EPSG:4205', 'EPSG:4326'): QgsDatumTransform.TransformPair(source_id_2, dest_id_2)})
 
     def testMissingTransforms(self):
         # fudge context xml with a missing transform
@@ -366,7 +367,7 @@ class TestQgsCoordinateTransformContext(unittest.TestCase):
                                                    QgsCoordinateReferenceSystem('EPSG:4283'), 1, 2)
         project.setTransformContext(context)
         self.assertEqual(len(context_changed_spy), 1)
-        self.assertEqual(project.transformContext().sourceDestinationDatumTransforms(), {('EPSG:3111', 'EPSG:4283'): QgsCoordinateTransform.TransformPair(1, 2)})
+        self.assertEqual(project.transformContext().sourceDestinationDatumTransforms(), {('EPSG:3111', 'EPSG:4283'): QgsDatumTransform.TransformPair(1, 2)})
 
     def testReadWriteSettings(self):
         context = QgsCoordinateTransformContext()
@@ -391,8 +392,8 @@ class TestQgsCoordinateTransformContext(unittest.TestCase):
                                                                    QgsCoordinateReferenceSystem(4326), source_id_2, dest_id_2))
 
         self.assertEqual(context.sourceDestinationDatumTransforms(),
-                         {('EPSG:4204', 'EPSG:4326'): QgsCoordinateTransform.TransformPair(source_id_1, dest_id_1),
-                          ('EPSG:4205', 'EPSG:4326'): QgsCoordinateTransform.TransformPair(source_id_2, dest_id_2)})
+                         {('EPSG:4204', 'EPSG:4326'): QgsDatumTransform.TransformPair(source_id_1, dest_id_1),
+                          ('EPSG:4205', 'EPSG:4326'): QgsDatumTransform.TransformPair(source_id_2, dest_id_2)})
 
         # save to settings
         context.writeSettings()
@@ -404,8 +405,8 @@ class TestQgsCoordinateTransformContext(unittest.TestCase):
 
         # check result
         self.assertEqual(context2.sourceDestinationDatumTransforms(),
-                         {('EPSG:4204', 'EPSG:4326'): QgsCoordinateTransform.TransformPair(source_id_1, dest_id_1),
-                          ('EPSG:4205', 'EPSG:4326'): QgsCoordinateTransform.TransformPair(source_id_2, dest_id_2)})
+                         {('EPSG:4204', 'EPSG:4326'): QgsDatumTransform.TransformPair(source_id_1, dest_id_1),
+                          ('EPSG:4205', 'EPSG:4326'): QgsDatumTransform.TransformPair(source_id_2, dest_id_2)})
 
 
 if __name__ == '__main__':