Hi Greg, That works but I can only chose one polygon and have its attributes identified. I want to plot my map, then be able to pan and zoom, and chose several polygons to have their attributes identified (one at a time would be fine).
Should I be exploring maptools? Thanks, Ty On Aug 16, 2012, at 6:33 PM, Greg Snow wrote: You could try something like: library(rgdal) library(sp) scot_BNG <- readOGR(dsn=dsn, layer="scot_BNG") plot(scot_BNG) tmp <- SpatialPoints(locator(1)) proj4string(tmp) <- proj4string(scot_BNG) over(tmp, scot_BNG) # or tmp2 <- over(scot_BNG, tmp) plot( scot_BNG[!is.na(tmp2),], add=TRUE, col='green') Does that do what you want? On Thu, Aug 16, 2012 at 9:05 AM, Frazier, Tyler James <[email protected]<mailto:[email protected]>> wrote: Hello, I am new to this group and am still working to figure out many things. I have a kind of basic question, regarding using R and interacting with plots. I have been exploring using the spplot in the sp package as a means to interact with plots, but haven't figured out how to use the function to identify specific attributes associated with an individual polygons. My code is really basic, I simply ea <- readOGR(".","ghana_eas_ft") plot(ea) is it possible to plot the map in a way where I can use the cursor in R to chose and identify attributes associated with a polygon. Also here is the output of str(ea) which follows with a lot of information after the @polygons which I assume is part of the sp class structure. Formal class 'SpatialPolygonsDataFrame' [package "sp"] with 5 slots ..@ data :'data.frame': 12438 obs. of 3 variables: .. ..$ EA_NOS : Factor w/ 1133 levels "001-005, 340-342",..: 1110 986 985 976 982 983 978 741 974 975 ... .. ..$ REG_CODE : Factor w/ 10 levels "01","02","03",..: 1 1 1 1 1 1 1 1 1 1 ... .. ..$ DIST_CODE: Factor w/ 18 levels "01","02","03",..: 9 9 9 9 9 9 9 9 9 9 ... ..@ polygons :List of 12438 I am wondering if there are newer packages which provide the identify function for polygons. Currently I am referencing the Applied Spatial Data Analysis with R text. Thanks! Ty [[alternative HTML version deleted]] _______________________________________________ R-sig-Geo mailing list [email protected] https://stat.ethz.ch/mailman/listinfo/r-sig-geo
