Hi Dazhi,
The way to do this is use a point-in-polygon test. The sp package (which
maptools has as a dependency) has the function point.in.polygon which
performs a point in polygon test.
Dan
On 10/22/2010 06:40 AM, Dazhi Jiao wrote:
Hi,
I am new to spatial data analysis so sorry to ask a dummy question. I am
trying to use R maptools to map longitude/latitude to a list of school
districts. I have read in the shapefile and there are about 500 polygons.
Now given a new point with longitude and latitude, how can I decide which
polygon it belongs to?
Thank you!
Dazhi
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