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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'>ArcGIS 10 installs Python 2.6 and numpy 1.3.0. It does not install
GDAL with Python bindings. It includes a new Python module from ESRI called
ArcPy. This module supposedly provides the capability of reading and writing
raster layers in the form of numpy arrays, similar to GDAL’s Python
bindings. I have not played with it much—only very briefly in Arc 9.4
Beta 2, when it did not seem to work very well. If you search the Arc 10 online
documentation you can probably find more information.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'>In principle, the ArcPy module may make it less necessary those
developing for ArcGIS with Python to resort to GDAL to read or write rasters.
If you do wish to use GDAL from ArcGIS 9.3 or 10, you must contend with an
important bug in ArcGIS that affects GDAL; see <a
href="http://trac.osgeo.org/gdal/ticket/3672">http://trac.osgeo.org/gdal/ticket/3672</a>.
I am corresponding with the ESRI developer who is investigating this. He
expressed an interest in fixing this in Arc 10 SP1 but has not committed to
doing so at this time.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'>To work around that, when creating Python-based geoprocessing
tools that use GDAL, you must disable the “Run Python script in process”
option in the ArcGIS UI. That has certain implications on performance but is
probably fine for most people. I developed a hack that works around the ArcGIS
bug that allows you to enable the “Run Python script in process”
but unless you are pretty savvy with Python (comfortable writing C extension
modules) I do not recommend that approach. If anyone is interested I can
provide an example.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'>Best,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'>Jason<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
gdal-dev-bounces@lists.osgeo.org [mailto:gdal-dev-bounces@lists.osgeo.org] <b>On
Behalf Of </b>Discourse Maps<br>
<b>Sent:</b> Wednesday, August 11, 2010 10:38 AM<br>
<b>To:</b> gdal-dev@lists.osgeo.org<br>
<b>Subject:</b> [gdal-dev] ArcGIS 10<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>I
hear the new ArcGIS10 has GDAL and NumPy built into the geoprocessor. If
this is true, does that mean that users will not have to install the various
Python library bindings GDAL, numpy, etc. after a full Arc10 install? <o:p></o:p></span></p>
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