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POUniformly colorize perfectly flat surfaces (contiguous pixels) in geotiff file in R
 

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  1. POUniformly colorize perfectly flat surfaces (contiguous pixels) in geotiff file in R
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    <p>I am using RGDAL to read in and plot a geotiff file:</p> <pre><code>df.gtiff = readOGR("/df.tif") image(df.gtiff, red=1, green=2, blue=3) </code></pre> <p>The map contains some perfectly flat surfaces which are either lakes or ocean-sections, i.e. there are patches where contiguous pixels have the same elevation. Is there any way to identify these patches, say as polygons, so that I can color them uniformly (to blue, for example)? [Note: the file is too large to upload, so <code>gdalinfo(df.tif)</code> is given below):</p> <pre><code>Driver: GTiff/GeoTIFF Files: ~/df.tif Size is 2928, 2285 Coordinate System is: GEOGCS["WGS 84", DATUM["WGS_1984", SPHEROID["WGS 84",6378137,298.257223563, AUTHORITY["EPSG","7030"]], AUTHORITY["EPSG","6326"]], PRIMEM["Greenwich",0], UNIT["degree",0.0174532925199433], AUTHORITY["EPSG","4326"]] Origin = (81.381111111111110,22.564444444444447) Pixel Size = (0.002083333333333,-0.002083333333333) Metadata: AREA_OR_POINT=Area Image Structure Metadata: INTERLEAVE=PIXEL Corner Coordinates: Upper Left ( 81.3811111, 22.5644444) ( 81d22'52.00"E, 22d33'52.00"N) Lower Left ( 81.3811111, 17.8040278) ( 81d22'52.00"E, 17d48'14.50"N) Upper Right ( 87.4811111, 22.5644444) ( 87d28'52.00"E, 22d33'52.00"N) Lower Right ( 87.4811111, 17.8040278) ( 87d28'52.00"E, 17d48'14.50"N) Center ( 84.4311111, 20.1842361) ( 84d25'52.00"E, 20d11' 3.25"N) Band 1 Block=2928x1 Type=Byte, ColorInterp=Red Band 2 Block=2928x1 Type=Byte, ColorInterp=Green Band 3 Block=2928x1 Type=Byte, ColorInterp=Blue </code></pre>
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    1. COWhat do your bands represent?
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    2. CONot sure. The data is GMTED2010.
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