On 27/08/14 00:12, Alessandro Samuel Rosa wrote:
Dear GRASS GIS developers,
I am planning to use v.perturb to run a spatial simulated annealing
exercise. Two drawbacks with v.perturb exist. First, "output vector
points are not guaranteed to be contained within the current geographic
region". Second, all vector points are perturbed together.
Is it very difficult to solve this issues?
What exactly are your objectives ?
You can use v.extract with the random= option or v.kcv+v.extract to
create a sample of points you can then perturb instead of perturbing all
points.
To make sure your points still fall into the region, you can use
v.in.region to create a polygon representing the region, then v.select
within your sample those that fall into the polygon.
Moritz
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