[GRASS-dev] Pygrass - Getting pixel infos from a raster map

[Sören Gebbert]

Hi,
The class pygrass.raster.RasterSegment is not directly related to the
output created by i.segment.
It is a class to allow random read and write access to very large
raster layers, that do not fit into the main memory.
Please use pygrass.raster.RasterRow[1] from grass7.2 for row-wise
access to raster maps.

Best regards
Soeren

[1] https://grass.osgeo.org/grass70/manuals/libpython/pygrass.raster.html#pygrass.raster.RasterRow

2017-03-14 20:18 GMT+01:00 Lucas lefevre <lucas.lefevre at hotmail.com>:
> Hi,
>
>
> I'm new to Grass and Grass development.
>
>
> I'm writing a script using pygrass that should interact with areas in a
> raster map (output of i.segment). The final goal would be to highlight some
> of them to the user.
>
> But I can't even figure out how get infos from the different segments or
> even the raw pixels.
>
>
> When instantiating a RasterSegment object
> (https://grass.osgeo.org/grass70/manuals/libpython/pygrass.raster.html#pygrass.raster.RasterSegment)
> and using the method .get(row, col) it gives me -2147483648 for .get(0,0)
> and other values for 'row' and 'col' give 0.
>
> This doesn't make any sense to me, am I missing something ?
>
> (Note that both .exist() and .is_open() give True on the RasterSegment
> object)
>
>
> Any help would be appreciated !
>
>
> Lucas
>
>
>
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