Changes between Initial Version and Version 1 of Processing/DEM2WGS84


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Timestamp:
Nov 23, 2010 1:18:58 PM (10 years ago)
Author:
iopa
Comment:

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  • Processing/DEM2WGS84

    v1 v1  
     11. At this stage it is assumed you have created a GRASS project in UTM projection and imported the DEM for your area in that project.
     2
     32. Create a new GRASS project in the same database as your UTM project.
     4   1. Let's assume the name is AREA_LL and mapset PERMANENT.
     5   2. The projection needs to be Lat/Lon, the area boundaries are not important.
     6   3. The resolution can also by any for now.
     7   4. The datum should wgs84 and parameter should be 1.
     8
     92. Once you have entered the AREA_LL project, import the elevation spheroid as below;
     10   "r.in.ascii input=~arsf/dems/geoid-spheroid/ww15mgh.grd output=wwgsg"
     11
     123. Now you can exist AREA_LL, go back to your UTM project
     13   1. Import/Re-project the elevation spheroid as below;
     14   "r.proj -n input=wwgsg location=AREA_LL mapset=PERMANENT output=wwgsgUTM"
     15   2. Now elevated the DEM by adding the spheroid;
     16   "r.mapcalculator amap=yourDEMmap bmap=wwgsgUTM formula=A+B outfile=yourelevatedDEMmap help=-"
     17
     184. Process is complete!
     19