[gdal-dev] problem with datatype in python

[Luca Delucchi]

Hi devs,

I'm trying to rasterize a vector layer and convert it to numpy array.
I'm using the gdal.RasterizeLayer function but I have problem to set
the right datatype. I would like to have UInt32 but I got every time
Byte, this is my code

target_ds = gdal.GetDriverByName('MEM').Create('', xcount, ycount,
gdal.GDT_UInt32)
target_ds.SetGeoTransform((fi.ulx, fi.geotransform[1], 0, fi.uly, 0,
fi.geotransform[5]))
shape_datasource = ogr.Open(invect)
shape_layer = shape_datasource.GetLayer()
# create for target raster the same projection as for the value raster
raster_srs = osr.SpatialReference()
raster_srs.ImportFromWkt(fi.s_fh.GetProjectionRef())
target_ds.SetProjection(raster_srs.ExportToWkt())
# rasterize zone polygon to raster
gdal.RasterizeLayer(target_ds, [1], shape_layer, None, None, [1],
['ATTRIBUTE=id', 'ALL_TOUCHED=TRUE'])
trees_indices = gdal_array.DatasetReadAsArray(target_ds)

This is the debug

(Pdb) trees_indices.max()
255
(Pdb) ba=target_ds.GetRasterBand(1)
(Pdb) ba.DataType
1

Have you any idea to solve this problem?

-- 
ciao
Luca

http://gis.cri.fmach.it/delucchi/
www.lucadelu.org