[gdal-dev] DataSource/Dataset using gdal.Grid()

[Even Rouault]

On jeudi 1 juin 2017 18:13:00 CEST Kai Muehlbauer wrote:
> Hi everyone,
> 
> I'm using python-bindings gdal.Grid() function to grid scattered data.
> 
> I have a in-memory vector point data inside <class
> 'osgeo.ogr.DataSource'> "ds" which I want to feed directly to gdal.Grid().
> 
> ds2 = gdal.Grid('', ds, format='MEM',
>                     width=900, height=900,
>                     algorithm=algo,
>                     zfield='ZX')
> 
> Unfortunately I get a "TypeError: in method 'GridInternal', argument 2
> of type 'GDALDatasetShadow *'", see complete trace at the end.
> 
> If I save this dataset as is to an ESRI-Shapefile "test", I can
> successfully do this:
> 
> ds2 = gdal.Grid('', 'test', format='MEM',
>                     width=900, height=900,
>                     algorithm=algo,
>                     zfield='ZX')
> 
> Although I'm happy to get this running that way, I really would avoid
> the save-to-disc part. Can I somehow fake my <osgeo.ogr.DataSource>
> object to behave like a Dataset object or do some other magic? Any hints
> very much appreciated.

gdal.Grid() and other utility-as-a-function requires GDALDataset and not 
legacy OGRDataSource,
so create your vector memory dataset with :

ds = gdal.GetDriverByName('Memory').Create('', 0, 0, 0, gdal.GDT_Unknown)

Even

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