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copied!<p>You are trying to display points but you are using an <code>SpatialPolygonsDataFrame</code> source. You can extract the coordinates of the centroids with <code>coordinates</code> and use them as coordinates of your data, but I am not sure if that is what you need:</p> <pre><code>library(sp) library(rgdal) rus <- url("http://www.filefactory.com/file/4h1hb5c1cw7r/n/RUS_adm1_RData") load(rus) proj4.str <- CRS("+init=epsg:3413 +lon_0=105") gadm.prj <- spTransform(gadm, proj4.str) ## IDs needed to match polygons and data nms <- gadm.prj$NAME_1 ll <- coordinates(gadm.prj) </code></pre> <p>On the other hand, I cannot retrieve correctly the <code>data</code> column of your file. I fill it with some noise:</p> <pre><code>popul <- read.csv2('/tmp/popul.txt') popul$data <- runif(nrow(popul)) </code></pre> <p>Now it's time to match coordinates and data (similar to what we did in <a href="https://stackoverflow.com/questions/17163670/animated-gadm-map-in-r/17180169#17180169">this previous question</a>):</p> <pre><code>ord1 <- match(nms, popul$region) popul <- popul[ord1,] row.names(popul) <- nms row.names(ll) <- nms popSP <- SpatialPointsDataFrame(ll, popul["data"], proj4string=proj4.str) </code></pre> <p>This <code>SpatialPointsDataFrame</code> can be directly displayed with <code>spplot</code> with the boundaries below using <code>sp.layout</code>.</p> <pre><code>spplot(popSP, sp.layout=list('sp.polygons', gadm.prj)) </code></pre> <p><img src="https://i.stack.imgur.com/GExCG.png" alt="result"></p>

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