[GRASS-dev] Re: [GRASS-user] how to measure distances in a
constrained space
Moritz Lennert
mlennert at club.worldonline.be
Thu Nov 13 04:51:03 EST 2008
On 13/11/08 10:04, Hamish wrote:
>> r.grow.distance creates a distance map from each point, but
>> there is no way of telling it anything about null cells or
>> barriers. Even when setting a mask, r.grow.distance fills in
>> the whole region, which seems like a bug to me.
>
>
> perhaps if you invert the map?
>
>
> ie put starting point in null space and it will grow until/around cells
> with value?
You mean invert the mask, so that land masses are nulls and water
non-nulls ?
Doesn't work.
r.grow.distance just seems to ignore the mask. Glynn ?
Moritz
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