[gdal-dev] getting reason info when is_valid() returns false

[Paul Meems]

We're using GDAL and GEOS in MapWindow GIS and we use the GEOS version of
IsValid(). I think it is the same GDAL is using.
The latest version of GEOS has a IsValidReason, telling you what was wrong.

I hope it helps,

Thanks,

Paul

--
Paul Meems
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2010/6/10 Peter Freimuth <pfreimuth at arcor.de>

> Hi List,
> i am working with python ogr api and i check features which the
> applications gets from esri shapefiles to match several criterias.
>        if not xOgrGeometry.IsValid():
>            sMsg = "IsValid check failed! We have an invalid feature
> geometry!"
>            wkt=xOgrGeometry.ExportToWkt()
>            xLogger.error(sMsg + "Geometry is: [%s]" % wkt)
>            return [0, sMsg]
> It would be great if there is a possibility to get the reason for why
> is_valid() failed. I checked also shapely but i could'nt find something
> that tells me the reason like selfintersecting or other.
>
> Any hint on how to extract the reason string is welcome.
>
> Kind regards,
> Peter
>
> --
> Peter Freimuth
>
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