[GRASS-user] Check if a raster map has any valid pixel

[Kim Besson]

Thank Glynn. But how can I retrieve min and max using  a Python Script?


2010/10/25 Glynn Clements <glynn at gclements.plus.com>

>
> Kim Besson wrote:
>
> > I have a python script where I need to check if an input raster map has
> any
> > valid pixel (at least one pixel that is not null). How can I check this
> > (easy and quick way?) in order to be integrated in my Script?
>
> Check the range:
>
>        $ r.mapcalc --o 'foo = null()'
>        $ r.info -r foo
>        min=NULL
>        max=NULL
>
> The range can only have min=max=NULL if there are no non-null cells.
>
> --
> Glynn Clements <glynn at gclements.plus.com>
>
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