[GRASS-user] how to calculate area of voronoi polygons considering the boundary of the catchment

[Moritz Lennert]

On 27/07/09 21:38, daljeet wrote:
> Hi,
> 
> I have the point rainfall data of a region. Few of the point data are
> outside the region of interest.
> 
> I am making the voronoi polygons using the v.voronoi on the vector imported
> from this point ascii (x,y,z) data.
> 
> The polygon may be fully inside the region of interest or may be partially
> outside the region of interest.
> 
> In case of the polygon which is partially outside the region of interest,
> the area which is inside the region of interest need to be calculated. How
> to calculate this?

- Define region of interest with g.region.
- Create polygon of region with v.in.region.
- Overlay voronoi polygons with region polygon with v.overlay operator=AND

> How can i calculate the area of voronoi polygon.

v.report or v.to.db

Moritz