[GRASS-user] how to test if a point is inside a polygon

GRASS GRASS user
1

Hi,

I haven't worked much with the vector features of grass. Is there a way to query if a given point is inside if a polygon (closed area)?

Many thanks
Wolfgang

2

Don't know if there's a faster way, but i'll do this:

1 - Buffer (small radius) around points
2 - Intersection with polygons
3- Calculate the area of each intersection
4 - Extract the ones that are >0

Let me know

Bye
Luca

Il giorno 12/lug/07, alle ore 16:10, WolfgangZ ha scritto:

Hi,

I haven't worked much with the vector features of grass. Is there a way to query if a given point is inside if a polygon (closed area)?

Many thanks
Wolfgang

3

v.select will allow you to select points which overlap areas or vice versa.

v.select ainput=points binput=areas output=points_in_areas

points_in_areas will contain points which are inside the areas.

--Wolf

On 12.07.2007 17:10, WolfgangZ wrote:

Hi,

I haven't worked much with the vector features of grass. Is there a way
to query if a given point is inside if a polygon (closed area)?

Many thanks
Wolfgang

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http://grass.itc.it/mailman/listinfo/grassuser

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<:3 )---- Wolf Bergenheim ----( 8:>

4

Wolf Bergenheim schrieb:

v.select will allow you to select points which overlap areas or vice versa.

v.select ainput=points binput=areas output=points_in_areas

points_in_areas will contain points which are inside the areas.

--Wolf

On 12.07.2007 17:10, WolfgangZ wrote:

Hi,

I haven't worked much with the vector features of grass. Is there a way
to query if a given point is inside if a polygon (closed area)?

Many thanks
Wolfgang

Hi Wolf,

thank for your help. There are sometimes too many commands in grass to find the right one!

Wolfgang

5

Now in the FAQ:

http://grass.gdf-hannover.de/wiki/Category:FAQ
-> Point in polygon

Markus
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