[R] basic spatial query

[Rolf Turner]

On 28/01/2008, at 11:14 PM, jgarcia at ija.csic.es wrote:

> Hello;
> Please coud you advise me of a simple way to select points (x,y
> coordinates) that fall within a polygon.
> I've got a set of polygons, each one defined by an arbitrary number of
> points, and several points inside each polygon.
> I know this is simple with a GIS, but I'd rather do it inside R.

You could convert the polygon to an owin object and use inside.owin()
in the spatstat package.

You could also use the undocumented spatstat function inside.xypolygon 
().

	cheers,

		Rolf Turner


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