Changes between Initial Version and Version 1 of FAQ/azgcorrDEM


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Timestamp:
Jan 20, 2010 3:59:18 PM (10 years ago)
Author:
benj
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  • FAQ/azgcorrDEM

    v1 v1  
     1=== Q: What is the azgcorr ASCII DEM format? ===
     2
     3'''A:'''[[BR]]
     4
     5The ASCII DEM format used by azgcorr is a flat ASCII file with regularly-spaced height values, with a header line included at the top. The header data items are:
     6
     7North->South   Xsize    YSize    Xmin    Ymin    Xmax    Ymax    grid size
     8
     9So eg.[[BR]]
     101 2000 2000 400000 850000 410000 860000 5
     11
     12..means a DEM that starts in the north-west corner, is 2000x2000 cells, has X values from positions 400000-410000, Y values from positions 850000-860000 and a resolution of 5. This particular example is from a British National Grid projection DEM, as would normally be used for flights in the UK, so the positions are in metres and are related to that projection.