Message-ID: <A30E66E6-767B-48BB-ABE0-2D1E6AB2A79C@exeter.ac.uk>
Date: 2009-02-05T14:51:36Z
From: Baptiste Auguie
Subject: maptools: Test if point is in polygon
In-Reply-To: <be0315fb0902050521h7f97bdf0pe64dc8f817c6998d@mail.gmail.com>
I don't know about the maptools package but one general way to do this
would be to compute the convex hull (?chull) of the augmented set of
points and test if the point belongs to it.
Hope this helps,
baptiste
On 5 Feb 2009, at 13:21, Aleksandr Andreev wrote:
> In R's maptools package, is there a built-in function to test if a
> given point is "inside" a given polygon on the map? The map was
> loaded from an ESRI Shapefile. The point's latitude and longitude are
> known.
>
> Thank you!
>
> Aleks
>
> --
> ------------------------
> Aleksandr Andreev
> Fulbright Fellow
> Graduate School of Management
> St Petersburg State University
>
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_____________________________
Baptiste Augui?
School of Physics
University of Exeter
Stocker Road,
Exeter, Devon,
EX4 4QL, UK
Phone: +44 1392 264187
http://newton.ex.ac.uk/research/emag