I'm new here and I'm new at programing with GDAL C#.
My question is how I can get the value of SRTM GEOTIFF pixel to compare with it's neighbors, and how can I get the values of Geotiff tags.
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You have two questions:
Reading pixel data from the Geotiff: Here you find a C# GDAL Read Raster Code Sample. The final reading method is called Band.ReadRaster!
Reading Geotiff-Tags: Depends which Tags you mean...