[R-sig-Geo] identying shapefile polygons containing long-lat points

[Don MacQueen]

I believer the overlay() function in the sp package will do this.

-Don

At 7:33 PM -0400 7/22/08, jatwood at montana.edu wrote:
>Good Afternoon
>I searched the archives but could not find the answer to my question.
>I have shapefiles for various geographic regions such as states, counties,
>zipcode areas, townships, etc.  I also have long-lat coordinates for 12000
>plus weather stations.  I am able to use maptools to plot the maps and am
>able to plot the points on the polygon maps with appropriate text. However,
>I also need to be able to identify which shapefile polygon each weather
>station (or pobbibly other long-lat points) lies within.
>
>Does any package have a function similar to the "maps" packages'
>"map.where" function that would work with more general shapefile polygons?
>
>I am new to this list so please excuse me if this question has been
>previously addressed.  I will appreciate any help or suggestions.
>
>   
>
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-- 
---------------------------------
Don MacQueen
Lawrence Livermore National Laboratory
Livermore, CA, USA
925-423-1062
macq at llnl.gov