[R] basic spatial query

[Roger Bivand]

 <jgarcia <at> ija.csic.es> writes:

> 
> 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.

If your data are geographical, please see ?"overlay-methods" in the sp package.
You may also choose to follow up this question on the R-sig-geo list. There are
also ways of doing this at a lower level (without creating sp objects first) in
at least the splancs package, say if the data are not geographical.

Roger
 

> Thanks and best regards,
> Javier
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