[gdal-dev] wrapper_GDALWarpDestName returned NULL without setting an error - from Python gdalwarp interface

[Robin Wilson]

Hi,

I'm very much enjoying the new feature in GDAL that gives programmatic access to the command-line tools. However, I've run into a problem using gdal.Warp from within Python.

In the example IPython session below, you can see that I try to run gdal.Warp and get an error, but using the equivalent parameters for the command-line (run with the ! at the beginning from within IPython), it works fine.


In [15]: gdal.Warp('data.vrt', 'robin2.tif', srcSRS = 'EPSG:4326', dstSRS = 'EPSG:27700', geoloc=True)
---------------------------------------------------------------------------
SystemError                               Traceback (most recent call last)
<ipython-input-15-279de83a9634> in <module>()
----> 1 gdal.Warp('data.vrt', 'robin2.tif', srcSRS = 'EPSG:4326', dstSRS = 'EPSG:27700', geoloc=True)

/Users/robin/anaconda3/lib/python3.5/site-packages/osgeo/gdal.py in Warp(destNameOrDestDS, srcDSOrSrcDSTab, **kwargs)
    547 
    548     if _is_str_or_unicode(destNameOrDestDS):
--> 549         return wrapper_GDALWarpDestName(destNameOrDestDS, srcDSTab, opts, callback, callback_data)
    550     else:
    551         return wrapper_GDALWarpDestDS(destNameOrDestDS, srcDSTab, opts, callback, callback_data)

SystemError: <built-in function wrapper_GDALWarpDestName> returned NULL without setting an error

In [16]: !gdalwarp data.vrt robin2.tif -geoloc -s_srs "EPSG:4326" -t_srs "EPSG:27700"
Creating output file that is 1240P x 1162L.
Processing input file data.vrt.
0...10...20...30...40...50...60...70...80...90...100 - done.

Am I doing something wrong here in how I set the parameters for the gdal.Warp call?

Thanks,

Robin

Dr Robin Wilson
Research Fellow
University of Southampton, UK

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