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    <p>Since you are using geographical data, maybe the <code>raster</code> package is useful for you. For example, let's display the altitude of France (download this <a href="http://diva-gis.org/data/alt/FRA_alt.zip" rel="nofollow"><code>zip</code></a> file or use the <code>raster::getData</code> function). After you <code>unzip</code> the file:</p> <pre><code>library(raster) fraAlt &lt;- raster('FRA_alt') plot(fraAlt) ## Not only France is displayed... </code></pre> <p>If you want to display only the altitude of France, you need the information of the boundaries: download this <a href="http://gadm.org/data/rda/FRA_adm0.RData" rel="nofollow"><code>RData</code></a> file (or use the <code>raster::getData</code> function). This <code>RData</code> contains a <code>SpatialPolygonsDataFrame</code> (named <code>gadm</code>) which can be converted to a <code>Raster</code> with:</p> <pre><code> mk &lt;- rasterize(gadm, fraAlt) </code></pre> <p>Now you can mask the altitude raster with the boundaries:</p> <pre><code> fraAltMask &lt;- mask(fraAlt, x) plot(fraAltMask) ##Now only France is displayed </code></pre> <p>Finally, if you want to use <code>lattice</code> methods you need the <code>rasterVis</code> package:</p> <pre><code> library(rasterVis) levelplot(fraAlt) levelplot(fraAltMask) </code></pre> <p>Now, all together with the boundaries superimposed:</p> <pre><code> s &lt;- stack(fraAlt, fraAltMask) layerNames(s) &lt;- c('Alt', 'AltMask') boundaries &lt;- as(gadm, 'SpatialLines') levelplot(s) + layer(sp.lines(boundaries)) </code></pre>
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    1. POHow to block a part of the level plot in R made using lattice package?
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    1. USOscar Perpiñán
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    1. COThanks a lot Oscar! I haven't tried it out yet. But will do so over the weekend. But I wanted to thank you for your response. Will let you know if it works.
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    2. COOscar the nature of my problem now stands changed. I want to be able to identify the states of India on that map. For this purpose I have a shapefile of the states of India. But I don't know how to proceed in this direction any further. I want to be able to overlay the boundaries of the states of Indian fiven by the shapefile onto this levelplot. Any suggestions would be welcome.
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    3. CO@Ridhima You can read a shapefile with `maptools::readShapeLines`. The result can be overlaid with `layer(sp.lines(object))`.
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