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2012-10-07T16:51:17.997
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<p>There is a tool included with GDAL that does what you're asking for: <a href="http://www.gdal.org/gdaldem.html" rel="nofollow noreferrer"><code>gdaldem</code></a>. (It's written in C++, not C#. If you download the GDAL source code, you'll find it under <code>gdal/apps/gdaldem.cpp</code>.)</p> <p>Here are some examples of using it.</p> <h2>Source Heightmap</h2> <p>This is just a greyscale PNG I found on Wikipedia:</p> <p><img src="https://i.stack.imgur.com/0RY9C.png" alt="Heightmap"></p> <h2>Hillshade</h2> <pre><code>gdaldem hillshade heightmap.png hillshaded.tif </code></pre> <p><img src="https://i.stack.imgur.com/u41rz.png" alt="Hillshaded"></p> <h2>Color-relief</h2> <pre><code>gdaldem color-relief heightmap.png ramp.txt relief.tif </code></pre> <p><img src="https://i.stack.imgur.com/dTlB4.png" alt="Color-relief"></p> <p>using <code>ramp.txt</code>:</p> <pre><code>0 0 0 255 63 0 255 255 127 0 255 0 191 255 255 0 255 255 0 0 </code></pre> <p>(You provide colors for different heights, and <code>gdaldem</code> will interpolate).</p> <h2>Slope with color-relief</h2> <pre><code>gdaldem slope heightmap.png sloped.tif gdaldem color-relief sloped.tif slope-ramp.txt slope-relief.tif </code></pre> <p><img src="https://i.stack.imgur.com/DokEU.png" alt="Slope with color-relief"></p> <p>Here's <code>slope-ramp.txt</code>:</p> <pre><code>0 255 255 255 90 0 0 0 </code></pre> <p>(This time, you provide colors for different angles).</p> <p>You might also be interested in some of other software using GDAL listed in the <a href="http://en.wikipedia.org/wiki/GDAL#Software_that_uses_GDAL.2FOGR" rel="nofollow noreferrer">Wikipedia entry</a>.</p>
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