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Asked: 2026-06-12T13:04:27+00:00

I am planning to build a sample C# application in which a tiff file

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I am planning to build a sample C# application in which a tiff file will be selected and displayed. Using GDALAPI i would like to perform hillshade, slope, color-relief related calculations on the displayed raster. are there any opensource projects already available for display of raster along with its info?

Regards,
Kishore

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  1. Editorial Team

    There is a tool included with GDAL that does what you’re asking for: gdaldem. (It’s written in C++, not C#. If you download the GDAL source code, you’ll find it under gdal/apps/gdaldem.cpp.)

    Here are some examples of using it.

    Source Heightmap

    This is just a greyscale PNG I found on Wikipedia:

    Heightmap

    Hillshade

    gdaldem hillshade heightmap.png hillshaded.tif

    Hillshaded

    Color-relief

    gdaldem color-relief heightmap.png ramp.txt relief.tif

    Color-relief

    using ramp.txt:

    0    0   0   255
63   0   255 255
127  0   255   0
191  255 255   0
255  255   0   0

    (You provide colors for different heights, and gdaldem will interpolate).

    Slope with color-relief

    gdaldem slope heightmap.png sloped.tif
gdaldem color-relief sloped.tif slope-ramp.txt slope-relief.tif

    Slope with color-relief

    Here’s slope-ramp.txt:

    0   255 255 255
90  0   0   0

    (This time, you provide colors for different angles).

    You might also be interested in some of other software using GDAL listed in the Wikipedia entry.

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