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2013-08-02T18:35:58.870
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All right, I'll bite. I'm not going to use base R because <code>plot</code> is too hard for me to understand, so instead we will be using <code>ggplot2</code>. <pre><code># UK shapefile found via http://www.gadm.org/download uk.url <- "http://www.filefactory.com/file/s3dz3jt3vr/n/GBR_adm_zip" # replace following with your working directory - no trailing slash work.dir <- "C:/Temp/r.temp/gb_map" # the full file path for storing file file.loc <- paste0(work.dir, "/uk.zip") download.file (uk.url, destfile = file.loc, mode = "wb") unzip(file.loc, exdir = work.dir) # open the shapefile require(rgdal) require(ggplot2) uk <- readOGR(work.dir, layer = "GBR_adm2") # use the NAME_2 field (representing counties) to create data frame uk.map <- fortify(uk, region = "NAME_2") # create fake count data... uk.map$count <- round(runif(nrow(uk.map), 0, 2500), 0) # quick visual check ggplot(uk.map, aes(x = long, y = lat, group = group, fill = count)) + geom_polygon(colour = "black", size = 0.5, aes(group = group)) + theme() </code></pre> This generates the output below, which may be similar to what you need. <img src="https://i.stack.imgur.com/8vlqD.png" alt="screenshot"> Note that we don't explictly specify the gradient in this case - we just leave it up to <code>ggplot</code>. If you wish to specify those details it is possible but more involved. If you go down that route you should create another column in <code>uk.map</code> to allocate each count into one of (say) 10 bins using the <code>cut</code> function. The <code>uk.map</code> data frame looks like this: <pre><code>> str(uk.map) 'data.frame': 427339 obs. of 8 variables: $ long : num -2.05 -2.05 -2.05 -2.05 -2.05 ... $ lat : num 57.2 57.2 57.2 57.2 57.2 ... $ order: int 1 2 3 4 5 6 7 8 9 10 ... $ hole : logi FALSE FALSE FALSE FALSE FALSE FALSE ... $ piece: Factor w/ 234 levels "1","2","3","4",..: 1 1 1 1 1 1 1 1 1 1 ... $ group: Factor w/ 1136 levels "Aberdeen.1","Aberdeenshire.1",..: 1 1 1 1 1 1 1 1 1 1 ... $ id : chr "Aberdeen" "Aberdeen" "Aberdeen" "Aberdeen" ... $ count: num 1549 1375 433 427 1282 ... > </code></pre>
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