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5.2 KiB
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<TITLE>GDAL/OGR</TITLE>
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<H1><A NAME="SECTION00080000000000000000">
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GDAL/OGR</A>
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</H1>
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The GDAL and OGR libraries provide support for raster and vector data formats. QGIS makes use of both of these libraries (which come bundled in one distribution).
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<P>
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Note: A Linux binary of GDAL is available at <TT><A NAME="tex2html12"
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HREF="http://www.remotesensing.org/gdal">http://www.remotesensing.org/gdal</A></TT>. If you choose to install the binary you will also need to download and unpack the source tree since QGIS needs the header files in order to compile.
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<P>
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To install GDAL/OGR from source:
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<OL>
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<LI>Download the GDAL distribution from <TT><A NAME="tex2html13"
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HREF="http://www.remotesensing.org/gdal">http://www.remotesensing.org/gdal</A></TT>. You should use version 1.1.9 or higher. Versions prior to 1.1.9 contained a bug that caused problems when a null feature was encountered. If you want to build vector support for GRASS, you must use GDAL 1.2.3.
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<P>
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</LI>
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<LI>Untar the distribution
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<PRE>
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tar xfvz /../path/../gdal-x.x.x.tar.gz
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</PRE>
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<P>
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</LI>
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<LI>Change to the gdal-x.x.x subdirectory that was created by step 2
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<PRE>
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cd gdal-x.x.x
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</PRE>
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<P>
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</LI>
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<LI>Configure GDAL
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<PRE>
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./configure
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</PRE>
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or if you want GRASS support
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<PRE>
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./configure --with-grass=<full path to grass install>
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</PRE>
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Depending on the GDAL version you are building, it may be necessary to specify -without-ogdi when running configure if you don't have the OGDI libary avaiable on your system.
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<P>
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</LI>
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<LI>Build and install GDAL:
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<PRE>
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make
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su
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make install
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</PRE>
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<P>
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</LI>
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<LI>In order to run GDAL after installing it is necessary for the shared
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library to be findable. This can often be accomplished by setting
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LD_LIBRARY_PATH to include /usr/local/lib. On Linux, you can add
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/usr/local/lib (or whatever path you used for installing GDAL) to
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/etc/ld.so.conf and run ldconfig as root.
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<P>
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</LI>
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<LI>Make sure that gdal-config (found in the bin subdirectory where GDAL was installed) is included in the PATH. If necessary, add the path to gdal-config to the PATH environment variable.
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<PRE>
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export PATH=/../path/../gdal-config:$PATH
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</PRE>
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<P>
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</LI>
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<LI>Check the install by running:
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<PRE>
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gdal-config --prefix
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</PRE>
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<P>
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</LI>
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</OL>
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<P>
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If you've had problems during the installation, refer to this manual, where the whole process is described with some more detail: <TT><A NAME="tex2html14"
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HREF="http://www.remotesensing.org/gdal/gdal_building.html">http://www.remotesensing.org/gdal/gdal_building.html</A></TT>
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HREF="install.html">Building and Installing QGIS</A>
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<B> Previous:</B> <A NAME="tex2html137"
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HREF="node7.html">GRASS</A>
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<ADDRESS>
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Gary Sherman
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2004-10-01
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