mapping by zip codes
Hi, You have to provide some more info in order for us to answer you question. How does 'your data' look like? A data.frame with x and y coordinates and more info? If this is correct, you need to convert the xy data.frame to a spatial object: library(sp) data(meuse) # data.frame # The columns with the x and y coordinates are called "x" and "y" coordinates(meuse) = ~x+y # SpatialPointsDataFrame Then you can use overlay() to find out in which customer is in which polygon. Then you can count the number of customers per zip code. cheers, Paul Alina Sheyman schreef:
I'm very new to creating maps using shapefiles, so this question might be pretty basic. I'm trying to create a map of the US, divided up by zip codes, where i then map number of customers by zip code. I located shapefiles for US with zip codes (although at this point only for individual states, and not the entire country) and read it into R using maptools, but now I need to apply my data (which I read into R as a separate data frame and not a shapefile) to that map. Which is the part where I get completely lost and not sure how to proceed. If anyone could give me any pointers I'd really appreciate it. thank you [[alternative HTML version deleted]]
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