Changes between Initial Version and Version 1 of Processing/demcompare


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Timestamp:
Sep 2, 2014 10:45:03 AM (5 years ago)
Author:
stgo
Comment:

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  • Processing/demcompare

    v1 v1  
     1= Comparison of lidar dems =
     2
     3We patch lidar data on to ASTER data during delivery creation and need to know how accurately that data has been patched and, if it is differing, to what level it differs.
     4
     5To do this we can use:
     6
     7{{{
     8demcompare.py -d lidarpatched.dem -n navfile.sol --lidar path/to/ascii
     9}}}
     10
     11This will create a patched aster dem to compare to the lidar dem, this will not be smoothed and as such is the raw ASTER data. It will give 2 outputs on completion the first is only the area covered by the lidar files, the second is the area only covered by the lidar data. All outputs are in metres.
     12
     13Preferably the averages would be around 0 metres, but in practice it tends to be around 4 - 8 metres for UK data and varying for UTM data.
     14
     15You can compare 2 dems already created using
     16
     17{{{
     18demcompare.py -d dem1.dem -c dem2.dem --lidar /if/needed
     19}}}
     20
     21Which will skip the patching process and just give the dem outputs, if you ude identical dems the outputs will be 0.