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<H1><A NAME="SECTION00080000000000000000">
GDAL/OGR</A>
</H1>
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).
<P>
Note: A Linux binary of GDAL is available at <TT><A NAME="tex2html12"
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.
<P>
To install GDAL/OGR from source:
<OL>
<LI>Download the GDAL distribution from <TT><A NAME="tex2html13"
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.
<P>
</LI>
<LI>Untar the distribution
<PRE>
tar xfvz /../path/../gdal-x.x.x.tar.gz
</PRE>
<P>
</LI>
<LI>Change to the gdal-x.x.x subdirectory that was created by step 2
<PRE>
cd gdal-x.x.x
</PRE>
<P>
</LI>
<LI>Configure GDAL
<PRE>
./configure
</PRE>
or if you want GRASS support
<PRE>
./configure --with-grass=<full path to grass install>
</PRE>
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.
<P>
</LI>
<LI>Build and install GDAL:
<PRE>
make
su
make install
</PRE>
<P>
</LI>
<LI>In order to run GDAL after installing it is necessary for the shared
library to be findable. This can often be accomplished by setting
LD_LIBRARY_PATH to include /usr/local/lib. On Linux, you can add
/usr/local/lib (or whatever path you used for installing GDAL) to
/etc/ld.so.conf and run ldconfig as root.
<P>
</LI>
<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.
<PRE>
export PATH=/../path/../gdal-config:$PATH
</PRE>
<P>
</LI>
<LI>Check the install by running:
<PRE>
gdal-config --prefix
</PRE>
<P>
</LI>
</OL>
<P>
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"
HREF="http://www.remotesensing.org/gdal/gdal_building.html">http://www.remotesensing.org/gdal/gdal_building.html</A></TT>
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<ADDRESS>
Gary Sherman
2004-10-01
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