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I have file : test.kml and I try to open it with GDAL/OGR (1.6) librairie in Python (2.5).

But I don't succed can you help me ?

This is my code : 

from osgeo import ogr

adresse = 'test.kml'
driver = ogr.GetDriverByName('KML')
datasource = driver.Open(adresse)
layer = datasource.GetLayer()
layerDefn = layer.GetLayerDefn()
featDefn = layer.GetLayerDefn()
feat = ogr.Feature(featDefn)
nbFeat = layer.GetFeatureCount()

print nbFeat

ERROR Traceback (most recent call last): File "C:\Documents and Settings\Guilhain\Mes documents\My Dropbox\dev\test.py", line 6, in layer = datasource.GetLayer() AttributeError: 'NoneType' object has no attribute 'GetLayer'

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  • Although I doubt it is the cause of your problem, is there any particular reason you are using GDAL 1.6 bindings? I think you may be better off with 1.7 or even 1.8. Just my 2 cents.
    – user890
    Jun 16, 2011 at 1:48

4 Answers 4

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4

The error you encountered shows that your value for "datasource" is not valid. Instead of using "adresse = 'test.kml'", try entering the full path to the xml file. For example "C:\myfiles\test.kml".

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  • for Windows paths in Python, you can type this out as r'C:\myfiles\test.kml' otherwise the slashes are escaped fror something else.
    – Mike T
    Jun 16, 2011 at 1:45
  • No it's not an error, it's a relative path...
    – Guilhain
    Jun 16, 2011 at 6:42
  • I do that, it doesn't work : adresse = r'C:/Documents and Settings/Guilhain/Mes documents/My Dropbox/dev/seb_gare/point_station.kml'
    – Guilhain
    Jun 17, 2011 at 9:29
  • Are you writing in an IDE that will allow you to step through the code? Take a step back and see if the output of 'datasource = driver.Open(adresse)' is what you want - it appears to be completing this step, but .GetLayer() is not set to operate on the correct input.
    – Radar
    Jun 17, 2011 at 15:57
3

Try adding this to your code to hopefully find out what might be going on with the datasource not being created:

ogr.UseExceptions()
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  • It doesn't change
    – Guilhain
    Jun 16, 2011 at 6:47
1

You must provide a name argument to the GetLayer() call, such as datasource.GetLayer("foo"). or use GetLayerByIndex(layer_number_starting_with_0)

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0

An old question, but none of the supplied answers appear to fix it. Is your GDAL built with the Expat XML Parser? I see the GDAL docs say that KML read is only supported if GDAL/OGR was built with Expat KML Parser.

Otherwise, only KML Write is supported.

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