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POPlotting results of geographical analysis within shapefiles onto Google map tiles
 

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  1. POPlotting results of geographical analysis within shapefiles onto Google map tiles
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    <p>I have performed a geographical analysis </p> <pre><code>library(PBSmapping); library(RgoogleMaps); library(maptools) cases&lt;-read.table("cases.csv") cases.ppp&lt;-ppp(cases@coords[,1], cases@coords[,2], unitname=c("km")) dens.cas &lt;- density.ppp(cases.ppp, bw) plot(dens.cas) </code></pre> <p>yielding the following image:</p> <p><img src="https://i.stack.imgur.com/gAWLm.png" alt="enter image description here"></p> <p>I would like to overlay this on some google map tiles, and I have been able to tell R to fetch the appropriate tile, as below:</p> <pre><code>shp &lt;- importShapefile('map.shp', projection="LL"); bb &lt;- qbbox(lat = shp[,"Y"], lon = shp[,"X"]); MyMap &lt;- GetMap.bbox(bb$lonR, bb$latR, destfile = "map.jpg"); </code></pre> <p><img src="https://i.stack.imgur.com/qUtwc.png" alt="enter image description here"></p> <p>However, I can't seem to find any solutions for laying the results of the analysis over the map tile. I know it is possible to overlay the shapefile using this solution:</p> <p><a href="https://stackoverflow.com/a/2105912/1540735">https://stackoverflow.com/a/2105912/1540735</a></p> <p>This does work, and is perfectly aligned in terms of geolocation (as below), but I lose the results of the analysis:</p> <pre><code>PlotPolysOnStaticMap(MyMap, shp, lwd=.5, col = rgb(1,1,1,0.2), add = F) </code></pre> <p><img src="https://i.stack.imgur.com/Db4qG.jpg" alt="enter image description here"></p> <p>Does anyone know how to overlay these? The numerical values that give rise to the colours are stored in dens.cas$v, and are stored as a 128*128 matrix, as far as I can tell.</p> <p>Many thanks to anyone who can help</p>
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