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Improve QgsCoordinateReferenceSystem documentation
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Nyall Dawson
parent
9e292d0cca
commit
d4ea95ea49
@ -33,7 +33,7 @@ class QgsCoordinateReferenceSystem
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/** Use this constructor when you want to create a CRS object using
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* a postgis SRID, an EpsgCrsId id or a QGIS CRS_ID.
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* @note We encourage you to use EpsgCrsId, Wkt or Proj4 to describe CRS's in your code
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* @note We encourage you to use EpsgCrsId, WKT or Proj4 to describe CRS's in your code
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* wherever possible. QGSI CRS_IDs are not guaranteed to be permanent / involatile.
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* @param theId The ID no valid for the chosen coordinate system id type
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* @param theType One of the types described in QgsCoordinateReferenceSystem::CrsType
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@ -53,7 +53,7 @@ class QgsCoordinateReferenceSystem
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*/
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bool createFromOgcWmsCrs( QString theCrs );
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/** Set up this srs by fetching the appropriate information from the
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/** Set up this CRS by fetching the appropriate information from the
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* sqlite backend. First the system level read only srs.db will be checked
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* and then the users ~/.qgis/qgis.db database will be checked for a match.
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* @note Any members will be overwritten during this process.
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@ -61,19 +61,19 @@ class QgsCoordinateReferenceSystem
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*/
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bool createFromSrid( const long theSrid );
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/** Set up this srs using a Wkt spatial ref sys definition.
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* The wkt will be converted to a proj4 string using OGR helper
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* functions. After this the srs databasses will be searched for matches.
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/** Set up this CRS using a WKT spatial ref sys definition.
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* The WKT will be converted to a proj4 string using OGR helper
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* functions. After this the SRS databases will be searched for matches.
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* First the system level read only srs.db will be checked
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* and then the users ~/.qgis/qgis.db database will be checked for a match.
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* @note Any members will be overwritten during this process.
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* @note SRID and EpsgCrsId may be blank if no match can be found on srs db.
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* @param theWkt The Wkt for the desired spatial reference system.
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* @note SRID and EpsgCrsId may be blank if no match can be found on SRS db.
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* @param theWkt The WKT for the desired spatial reference system.
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* @return bool TRUE if success else false
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*/
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bool createFromWkt( const QString &theWkt );
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/** Set up this srs by fetching the appropriate information from the
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/** Set up this CRS by fetching the appropriate information from the
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* sqlite backend. If the srsid is < 100000, only the system srs.db
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* will be checked. If the srsid > 100000 the srs will be retrieved from
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* the ~/.qgis/qgis.db
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@ -83,7 +83,7 @@ class QgsCoordinateReferenceSystem
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*/
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bool createFromSrsId( const long theSrsId );
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/** Set up this srs by passing it a proj4 style formatted string.
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/** Set up this CRS by passing it a proj4 style formatted string.
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* The string will be parsed and the projection and ellipsoid
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* members set and the remainder of the proj4 string will be stored
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* in the parameters member. The reason for this is so that we
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@ -94,7 +94,7 @@ class QgsCoordinateReferenceSystem
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*
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* We try to match the proj string to and srsid using the following logic:
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*
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* - perform a whole text search on srs name (if not null). The srs name will
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* - perform a whole text search on CRS name (if not null). The CRS name will
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* have been set if this method has been delegated to from createFromWkt.
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* - if the above does not match perform a whole text search on proj4 string (if not null)
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* - if none of the above match convert the proj4 string to an OGR CRS
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@ -111,7 +111,7 @@ class QgsCoordinateReferenceSystem
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*/
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bool createFromProj4( const QString &theProjString );
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/** Set up this srs from a string definition, by default a WKT definition. Otherwise
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/** Set up this CRS from a string definition, by default a WKT definition. Otherwise
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* the string defines a authority, followed by a colon, followed by the definition.
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* The authority can be one of "epsg", "postgis", "internal" for integer definitions,
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* and "wkt" or "proj4" for string definitions. The implementation of each authority
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@ -120,7 +120,7 @@ class QgsCoordinateReferenceSystem
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*/
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bool createFromString( const QString &theDefinition );
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/** Set up this srs from a various text formats.
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/** Set up this CRS from a various text formats.
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*
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* Valid formats: WKT string, "EPSG:n", "EPSGA:n", "AUTO:proj_id,unit_id,lon0,lat0",
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* "urn:ogc:def:crs:EPSG::n", PROJ.4 string, filename (with WKT, XML or PROJ.4 string),
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@ -145,7 +145,7 @@ class QgsCoordinateReferenceSystem
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*/
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static void setupESRIWktFix();
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/** Find out whether this CRS is correctly initialised and usable */
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/** Returns whether this CRS is correctly initialised and usable */
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bool isValid() const;
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/** Perform some validation on this CRS. If the sts doesn't validate the
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@ -155,7 +155,7 @@ class QgsCoordinateReferenceSystem
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* if that involves resorting to a hard coded default of geocs:wgs84.
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*
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* @note It is not usually necessary to use this function, unless you
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* are trying to force this srs to be valid.
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* are trying to force this CRS to be valid.
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*/
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void validate();
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@ -219,65 +219,75 @@ class QgsCoordinateReferenceSystem
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// Accessors -----------------------------------
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/** Get the SrsId - if possible
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* @return long theSrsId The internal sqlite3 srs.db primary key for this srs
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*/
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/** Returns the SrsId, if available.
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* @return the internal sqlite3 srs.db primary key for this srs
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* @see postgisSrid()
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*/
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long srsid() const;
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/** Get the postgis srid for this srs
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* @return long theSRID the Postgis spatial_ref_sys identifier for this srs (defaults to 0)
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/** Returns PostGIS SRID for the CRS.
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* @return the PostGIS spatial_ref_sys identifier for this CRS (defaults to 0)
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*/
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long postgisSrid() const;
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/** Get the authority identifier for this srs
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* @return QString the Authority identifier for this srs
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/** Returns the authority identifier for the CRS, which includes both the authority (eg EPSG)
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* and the CRS number (eg 4326). This is the best method to use when showing a very short CRS
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* identifier to a user, eg "EPSG:4326".
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* @returns the authority identifier for this CRS
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* @see description()
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*/
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QString authid() const;
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/** Get the Description
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* @return QString the Description A textual description of the srs.
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* @note A zero length string will be returned if the description is uninitialised
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/** Returns the descriptive name of the CRS, eg "WGS 84" or "GDA 94 / Vicgrid94". In most
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* cases this is the best method to use when showing a friendly identifier for the CRS to a
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* user.
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* @returns descriptive name of the CRS
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* @note an empty string will be returned if the description is not available for the CRS
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* @see authid()
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*/
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QString description() const;
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/** Get the Projection Acronym
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* @return QString theProjectionAcronym The official proj4 acronym for the projection family
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* @note A zero length string will be returned if the projectionAcronym is uninitialised
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/** Returns the projection acronym for the projection used by the CRS.
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* @returns the official proj4 acronym for the projection family
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* @note an empty string will be returned if the projectionAcronym is not available for the CRS
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* @see ellipsoidAcronym()
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*/
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QString projectionAcronym() const;
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/** Get the Ellipsoid Acronym
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* @return QString theEllipsoidAcronym The official proj4 acronym for the ellipoid
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* @note A zero length string will be returned if the ellipsoidAcronym is uninitialised
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/** Returns the ellipsoid acronym for the ellipsoid used by the CRS.
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* @returns the official proj4 acronym for the ellipoid
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* @note an empty string will be returned if the ellipsoidAcronym is not available for the CRS
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* @see projectionAcronym()
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*/
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QString ellipsoidAcronym() const;
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/** A helper to get an wkt representation of this srs
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* @return string containing Wkt of the srs
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/** Returns a WKT representation of this CRS.
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* @return string containing WKT of the CRS
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* @see toProj4()
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*/
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QString toWkt() const;
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/** Get the Proj Proj4 string representation of this srs.
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/** Returns a Proj4 string representation of this CRS.
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* If proj and ellps keys are found in the parameters,
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* they will be stripped out and the Projection and ellipsoid acronyms will be
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* they will be stripped out and the projection and ellipsoid acronyms will be
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* overridden with these.
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* @return QString theProj4String Proj4 format specifies that define this srs.
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* @note A zero length string will be returned if the toProj4 is uninitialised
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* @return Proj4 format string that defines this CRS.
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* @note an empty string will be returned if the CRS could not be represented by a Proj4 string
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* @see toWkt()
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*/
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QString toProj4() const;
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/** Get this Geographic? flag
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* @return bool theGeoFlag Whether this is a geographic or projected coordinate system
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/** Returns whether the CRS is a geographic CRS.
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* @returns true if CRS is geographic, or false if it is a projected CRS
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*/
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bool geographicFlag() const;
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/** Return if axis is inverted (eg. for WMS 1.3)
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* @return bool Whether this is crs axis is inverted
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/** Returns whether axis is inverted (eg. for WMS 1.3) for the CRS.
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* @returns true if CRS axis is inverted
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*/
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bool axisInverted() const;
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/** Get the units that the projection is in
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* @return QGis::UnitType that gives the units for the coordinate system
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/** Returns the units for the projection used by the CRS.
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*/
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QGis::UnitType mapUnits() const;
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@ -72,7 +72,7 @@ class CORE_EXPORT QgsCoordinateReferenceSystem
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/** Use this constructor when you want to create a CRS object using
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* a postgis SRID, an EpsgCrsId id or a QGIS CRS_ID.
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* @note We encourage you to use EpsgCrsId, Wkt or Proj4 to describe CRS's in your code
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* @note We encourage you to use EpsgCrsId, WKT or Proj4 to describe CRS's in your code
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* wherever possible. QGSI CRS_IDs are not guaranteed to be permanent / involatile.
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* @param theId The ID no valid for the chosen coordinate system id type
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* @param theType One of the types described in QgsCoordinateReferenceSystem::CrsType
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@ -98,7 +98,7 @@ class CORE_EXPORT QgsCoordinateReferenceSystem
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*/
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bool createFromOgcWmsCrs( QString theCrs );
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/** Set up this srs by fetching the appropriate information from the
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/** Set up this CRS by fetching the appropriate information from the
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* sqlite backend. First the system level read only srs.db will be checked
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* and then the users ~/.qgis/qgis.db database will be checked for a match.
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* @note Any members will be overwritten during this process.
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@ -106,19 +106,19 @@ class CORE_EXPORT QgsCoordinateReferenceSystem
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*/
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bool createFromSrid( const long theSrid );
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/** Set up this srs using a Wkt spatial ref sys definition.
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* The wkt will be converted to a proj4 string using OGR helper
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* functions. After this the srs databasses will be searched for matches.
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/** Set up this CRS using a WKT spatial ref sys definition.
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* The WKT will be converted to a proj4 string using OGR helper
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* functions. After this the SRS databases will be searched for matches.
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* First the system level read only srs.db will be checked
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* and then the users ~/.qgis/qgis.db database will be checked for a match.
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* @note Any members will be overwritten during this process.
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* @note SRID and EpsgCrsId may be blank if no match can be found on srs db.
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* @param theWkt The Wkt for the desired spatial reference system.
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* @note SRID and EpsgCrsId may be blank if no match can be found on SRS db.
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* @param theWkt The WKT for the desired spatial reference system.
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* @return bool TRUE if success else false
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*/
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bool createFromWkt( const QString &theWkt );
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/** Set up this srs by fetching the appropriate information from the
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/** Set up this CRS by fetching the appropriate information from the
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* sqlite backend. If the srsid is < 100000, only the system srs.db
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* will be checked. If the srsid > 100000 the srs will be retrieved from
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* the ~/.qgis/qgis.db
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@ -128,7 +128,7 @@ class CORE_EXPORT QgsCoordinateReferenceSystem
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*/
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bool createFromSrsId( const long theSrsId );
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/** Set up this srs by passing it a proj4 style formatted string.
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/** Set up this CRS by passing it a proj4 style formatted string.
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* The string will be parsed and the projection and ellipsoid
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* members set and the remainder of the proj4 string will be stored
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* in the parameters member. The reason for this is so that we
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@ -139,7 +139,7 @@ class CORE_EXPORT QgsCoordinateReferenceSystem
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*
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* We try to match the proj string to and srsid using the following logic:
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*
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* - perform a whole text search on srs name (if not null). The srs name will
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* - perform a whole text search on CRS name (if not null). The CRS name will
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* have been set if this method has been delegated to from createFromWkt.
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* - if the above does not match perform a whole text search on proj4 string (if not null)
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* - if none of the above match convert the proj4 string to an OGR CRS
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@ -156,7 +156,7 @@ class CORE_EXPORT QgsCoordinateReferenceSystem
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*/
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bool createFromProj4( const QString &theProjString );
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/** Set up this srs from a string definition, by default a WKT definition. Otherwise
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/** Set up this CRS from a string definition, by default a WKT definition. Otherwise
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* the string defines a authority, followed by a colon, followed by the definition.
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* The authority can be one of "epsg", "postgis", "internal" for integer definitions,
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* and "wkt" or "proj4" for string definitions. The implementation of each authority
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@ -165,7 +165,7 @@ class CORE_EXPORT QgsCoordinateReferenceSystem
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*/
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bool createFromString( const QString &theDefinition );
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/** Set up this srs from a various text formats.
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/** Set up this CRS from a various text formats.
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*
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* Valid formats: WKT string, "EPSG:n", "EPSGA:n", "AUTO:proj_id,unit_id,lon0,lat0",
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* "urn:ogc:def:crs:EPSG::n", PROJ.4 string, filename (with WKT, XML or PROJ.4 string),
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@ -190,7 +190,7 @@ class CORE_EXPORT QgsCoordinateReferenceSystem
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*/
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static void setupESRIWktFix();
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/** Find out whether this CRS is correctly initialised and usable */
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/** Returns whether this CRS is correctly initialised and usable */
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bool isValid() const;
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/** Perform some validation on this CRS. If the sts doesn't validate the
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@ -200,7 +200,7 @@ class CORE_EXPORT QgsCoordinateReferenceSystem
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* if that involves resorting to a hard coded default of geocs:wgs84.
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*
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* @note It is not usually necessary to use this function, unless you
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* are trying to force this srs to be valid.
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* are trying to force this CRS to be valid.
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*/
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void validate();
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@ -264,65 +264,75 @@ class CORE_EXPORT QgsCoordinateReferenceSystem
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// Accessors -----------------------------------
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/** Get the SrsId - if possible
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* @return long theSrsId The internal sqlite3 srs.db primary key for this srs
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/** Returns the SrsId, if available.
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* @return the internal sqlite3 srs.db primary key for this srs
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* @see postgisSrid()
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*/
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long srsid() const;
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/** Get the postgis srid for this srs
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* @return long theSRID the Postgis spatial_ref_sys identifier for this srs (defaults to 0)
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/** Returns PostGIS SRID for the CRS.
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* @return the PostGIS spatial_ref_sys identifier for this CRS (defaults to 0)
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*/
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long postgisSrid() const;
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/** Get the authority identifier for this srs
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* @return QString the Authority identifier for this srs
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/** Returns the authority identifier for the CRS, which includes both the authority (eg EPSG)
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* and the CRS number (eg 4326). This is the best method to use when showing a very short CRS
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* identifier to a user, eg "EPSG:4326".
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* @returns the authority identifier for this CRS
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* @see description()
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*/
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QString authid() const;
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/** Get the Description
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* @return QString the Description A textual description of the srs.
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* @note A zero length string will be returned if the description is uninitialised
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/** Returns the descriptive name of the CRS, eg "WGS 84" or "GDA 94 / Vicgrid94". In most
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* cases this is the best method to use when showing a friendly identifier for the CRS to a
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* user.
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* @returns descriptive name of the CRS
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* @note an empty string will be returned if the description is not available for the CRS
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* @see authid()
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*/
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QString description() const;
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/** Get the Projection Acronym
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* @return QString theProjectionAcronym The official proj4 acronym for the projection family
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* @note A zero length string will be returned if the projectionAcronym is uninitialised
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/** Returns the projection acronym for the projection used by the CRS.
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* @returns the official proj4 acronym for the projection family
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* @note an empty string will be returned if the projectionAcronym is not available for the CRS
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* @see ellipsoidAcronym()
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*/
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QString projectionAcronym() const;
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/** Get the Ellipsoid Acronym
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* @return QString theEllipsoidAcronym The official proj4 acronym for the ellipoid
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* @note A zero length string will be returned if the ellipsoidAcronym is uninitialised
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/** Returns the ellipsoid acronym for the ellipsoid used by the CRS.
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* @returns the official proj4 acronym for the ellipoid
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* @note an empty string will be returned if the ellipsoidAcronym is not available for the CRS
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* @see projectionAcronym()
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*/
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QString ellipsoidAcronym() const;
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/** A helper to get an wkt representation of this srs
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* @return string containing Wkt of the srs
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/** Returns a WKT representation of this CRS.
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* @return string containing WKT of the CRS
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* @see toProj4()
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*/
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QString toWkt() const;
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/** Get the Proj Proj4 string representation of this srs.
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/** Returns a Proj4 string representation of this CRS.
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* If proj and ellps keys are found in the parameters,
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* they will be stripped out and the Projection and ellipsoid acronyms will be
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* they will be stripped out and the projection and ellipsoid acronyms will be
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* overridden with these.
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* @return QString theProj4String Proj4 format specifies that define this srs.
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* @note A zero length string will be returned if the toProj4 is uninitialised
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* @return Proj4 format string that defines this CRS.
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* @note an empty string will be returned if the CRS could not be represented by a Proj4 string
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* @see toWkt()
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*/
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QString toProj4() const;
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/** Get this Geographic? flag
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* @return bool theGeoFlag Whether this is a geographic or projected coordinate system
|
||||
/** Returns whether the CRS is a geographic CRS.
|
||||
* @returns true if CRS is geographic, or false if it is a projected CRS
|
||||
*/
|
||||
bool geographicFlag() const;
|
||||
|
||||
/** Return if axis is inverted (eg. for WMS 1.3)
|
||||
* @return bool Whether this is crs axis is inverted
|
||||
/** Returns whether axis is inverted (eg. for WMS 1.3) for the CRS.
|
||||
* @returns true if CRS axis is inverted
|
||||
*/
|
||||
bool axisInverted() const;
|
||||
|
||||
/** Get the units that the projection is in
|
||||
* @return QGis::UnitType that gives the units for the coordinate system
|
||||
/** Returns the units for the projection used by the CRS.
|
||||
*/
|
||||
QGis::UnitType mapUnits() const;
|
||||
|
||||
@ -367,21 +377,21 @@ class CORE_EXPORT QgsCoordinateReferenceSystem
|
||||
static QString proj4FromSrsId( const int theSrsId );
|
||||
|
||||
/** Set the QGIS SrsId
|
||||
* @param theSrsId The internal sqlite3 srs.db primary key for this srs
|
||||
* @param theSrsId The internal sqlite3 srs.db primary key for this CRS
|
||||
*/
|
||||
void setInternalId( long theSrsId );
|
||||
/** Set the postgis srid
|
||||
* @param theSrid The postgis spatial_ref_sys key for this srs
|
||||
* @param theSrid The postgis spatial_ref_sys key for this CRS
|
||||
*/
|
||||
void setSrid( long theSrid );
|
||||
/** Set the Description
|
||||
* @param theDescription A textual description of the srs.
|
||||
* @param theDescription A textual description of the CRS.
|
||||
*/
|
||||
void setDescription( const QString& theDescription );
|
||||
|
||||
/** Set the Proj Proj4String.
|
||||
* @param theProj4String Proj4 format specifies
|
||||
* (excluding proj and ellips) that define this srs.
|
||||
* (excluding proj and ellips) that define this CRS.
|
||||
* @note some content of the PROJ4 string may be stripped off by this
|
||||
* method due to the parsing of the string by OSRNewSpatialReference .
|
||||
* For example input:
|
||||
@ -396,13 +406,13 @@ class CORE_EXPORT QgsCoordinateReferenceSystem
|
||||
*/
|
||||
void setGeographicFlag( bool theGeoFlag );
|
||||
|
||||
/** Set the EpsgCrsId identifier for this srs
|
||||
* @param theEpsg the ESPG identifier for this srs (defaults to 0)
|
||||
/** Set the EpsgCrsId identifier for this CRS
|
||||
* @param theEpsg the ESPG identifier for this CRS (defaults to 0)
|
||||
*/
|
||||
void setEpsg( long theEpsg );
|
||||
|
||||
/** Set the authority identifier for this srs
|
||||
* @param theID the authority identifier for this srs (defaults to 0)
|
||||
/** Set the authority identifier for this CRS
|
||||
* @param theID the authority identifier for this CRS (defaults to 0)
|
||||
*/
|
||||
void setAuthId( const QString& theID );
|
||||
/** Set the projection acronym
|
||||
@ -432,9 +442,9 @@ class CORE_EXPORT QgsCoordinateReferenceSystem
|
||||
// returns the same code as sqlite3_open
|
||||
static int openDb( const QString& path, sqlite3 **db, bool readonly = true );
|
||||
|
||||
//!The internal sqlite3 srs.db primary key for this srs
|
||||
//!The internal sqlite3 srs.db primary key for this CRS
|
||||
long mSrsId;
|
||||
//!A textual description of the srs.
|
||||
//!A textual description of the CRS.
|
||||
QString mDescription;
|
||||
//!The official proj4 acronym for the projection family
|
||||
QString mProjectionAcronym;
|
||||
@ -444,11 +454,11 @@ class CORE_EXPORT QgsCoordinateReferenceSystem
|
||||
bool mGeoFlag;
|
||||
//! The map units
|
||||
QGis::UnitType mMapUnits;
|
||||
//!If available, the Postgis spatial_ref_sys identifier for this srs (defaults to 0)
|
||||
//!If available, the Postgis spatial_ref_sys identifier for this CRS (defaults to 0)
|
||||
long mSRID;
|
||||
//!If available the authority identifier for this srs
|
||||
//!If available the authority identifier for this CRS
|
||||
QString mAuthId;
|
||||
//! Whether this srs is properly defined and valid
|
||||
//! Whether this CRS is properly defined and valid
|
||||
bool mIsValidFlag;
|
||||
|
||||
//! Work out the projection units and set the appropriate local variable
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user