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<h1>Source code for django.contrib.gis.gdal</h1><div class="highlight"><pre>
<span class="sd">"""</span>
<span class="sd"> This module houses ctypes interfaces for GDAL objects. The following GDAL</span>
<span class="sd"> objects are supported:</span>
<span class="sd"> CoordTransform: Used for coordinate transformations from one spatial</span>
<span class="sd"> reference system to another.</span>
<span class="sd"> Driver: Wraps an OGR data source driver.</span>
<span class="sd"> DataSource: Wrapper for the OGR data source object, supports</span>
<span class="sd"> OGR-supported data sources.</span>
<span class="sd"> Envelope: A ctypes structure for bounding boxes (GDAL library</span>
<span class="sd"> not required).</span>
<span class="sd"> OGRGeometry: Object for accessing OGR Geometry functionality.</span>
<span class="sd"> OGRGeomType: A class for representing the different OGR Geometry</span>
<span class="sd"> types (GDAL library not required).</span>
<span class="sd"> SpatialReference: Represents OSR Spatial Reference objects.</span>
<span class="sd"> The GDAL library will be imported from the system path using the default</span>
<span class="sd"> library name for the current OS. The default library path may be overridden</span>
<span class="sd"> by setting `GDAL_LIBRARY_PATH` in your settings with the path to the GDAL C</span>
<span class="sd"> library on your system.</span>
<span class="sd"> GDAL links to a large number of external libraries that consume RAM when</span>
<span class="sd"> loaded. Thus, it may desirable to disable GDAL on systems with limited</span>
<span class="sd"> RAM resources -- this may be accomplished by setting `GDAL_LIBRARY_PATH`</span>
<span class="sd"> to a non-existant file location (e.g., `GDAL_LIBRARY_PATH='/null/path'`;</span>
<span class="sd"> setting to None/False/'' will not work as a string must be given).</span>
<span class="sd">"""</span>
<span class="kn">from</span> <span class="nn">django.contrib.gis.gdal.error</span> <span class="kn">import</span> <span class="n">check_err</span><span class="p">,</span> <span class="n">OGRException</span><span class="p">,</span> <span class="n">OGRIndexError</span><span class="p">,</span> <span class="n">SRSException</span>
<span class="kn">from</span> <span class="nn">django.contrib.gis.gdal.geomtype</span> <span class="kn">import</span> <span class="n">OGRGeomType</span>
<span class="c"># Attempting to import objects that depend on the GDAL library. The</span>
<span class="c"># HAS_GDAL flag will be set to True if the library is present on</span>
<span class="c"># the system.</span>
<span class="k">try</span><span class="p">:</span>
<span class="kn">from</span> <span class="nn">django.contrib.gis.gdal.driver</span> <span class="kn">import</span> <span class="n">Driver</span>
<span class="kn">from</span> <span class="nn">django.contrib.gis.gdal.datasource</span> <span class="kn">import</span> <span class="n">DataSource</span>
<span class="kn">from</span> <span class="nn">django.contrib.gis.gdal.libgdal</span> <span class="kn">import</span> <span class="n">gdal_version</span><span class="p">,</span> <span class="n">gdal_full_version</span><span class="p">,</span> <span class="n">GDAL_VERSION</span>
<span class="kn">from</span> <span class="nn">django.contrib.gis.gdal.srs</span> <span class="kn">import</span> <span class="n">SpatialReference</span><span class="p">,</span> <span class="n">CoordTransform</span>
<span class="kn">from</span> <span class="nn">django.contrib.gis.gdal.geometries</span> <span class="kn">import</span> <span class="n">OGRGeometry</span>
<span class="n">HAS_GDAL</span> <span class="o">=</span> <span class="bp">True</span>
<span class="k">except</span> <span class="n">OGRException</span><span class="p">:</span>
<span class="n">HAS_GDAL</span> <span class="o">=</span> <span class="bp">False</span>
<span class="k">try</span><span class="p">:</span>
<span class="kn">from</span> <span class="nn">django.contrib.gis.gdal.envelope</span> <span class="kn">import</span> <span class="n">Envelope</span>
<span class="k">except</span> <span class="ne">ImportError</span><span class="p">:</span>
<span class="c"># No ctypes, but don't raise an exception.</span>
<span class="k">pass</span>
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