[GIS] How to turn a GeoTIFF file into a bmp file

cgeotiff-tiff

I need to get GeoTIFF files transformed into bmp files so that I can display them as apart of some software that I am working on. Unfortunately, I am a total newbie with GIS and really don't know much about geography. I am working in C++ and need to have this included in what I am doing. A dll file would be great, although it is my understanding that we might need to include the source code from which the dll is created. I am wide open to any other technique that could be used as well. Can anyone help me with this?

I should also note that I am working on a Windows machine.

Best Answer

For converting from GeoTiff to BMP you can use GDAL library. It has C++ API and well-documented.

I have found GDAL convertion example for C#. I hope it will help you to start from.

For BMP you will need to create "world file" to store GeoReferencing information. I think GDAL will create it by default.

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With libtiff you can't get altitude from you file. I spent a lot of time trying to do it with libgeotiff. My advice is to install GDAL.

Example:

GDALRasterIO( hBand_ , GF_Read , p, l, 1, 1, &pafScanline, 1, 1, GDT_Float32, 0, 0 );

[GIS] Extracting 5 bands geotiff file into RGB file using GDAL

Your values aren't in 0,255 since they are UInt16. You can try rescaling to 0,255 (GDAL works it out by default from input min/max and output default 0,255):

gdal_translate -b 1 -b 2 -b 3 -mask "none" "input.tif" "output.tif" -scale

Note you can add params if the defaults aren't sensible:

-scale [src_min src_max [dst_min dst_max]]

http://www.gdal.org/gdal_translate.html

Note that you obviously will lose some information at this lower colour depth, and it may be better to simply use a different program for viewing, that doesn't assume 8-bit RGB.

Best Answer

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