I believer the overlay() function in the sp package will do this.
-Don
At 7:33 PM -0400 7/22/08, [EMAIL PROTECTED] 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
[EMAIL PROTECTED]
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