Changes between Initial Version and Version 1 of Processing/NextMapDEMs


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Timestamp:
Jul 24, 2007 6:57:59 PM (13 years ago)
Author:
mggr
Comment:

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  • Processing/NextMapDEMs

    v1 v1  
     1= Creation of DEMs from NextMap data =
     2
     3(fast notes)
     4
     5load arc files into grass
     6 * import->raster->gdal
     7 * pick file
     8 * choose create new location if this is the first import
     9 * run (will fail for UK as it needs user input)
     10 * copy and paste command into grass shell so you can respond (e.g. `r.in.gdal -e input=/data/aegean1/nextmap_dems/neodc/by_tile/by_product/dsm/nk/nk02/nk02dsm/w001001.adf output=nk02`
     11 * if you need to import multiple rasters, you can use the location created, but must select extend region
     12 * (need to figure out how to join rasters into one, then subset in grass)
     13 
     14export as ASCII grid
     15
     16[you can load this grid into ENVI to test against vector layers, etc - file->open external->generic->ascii, then georeference (edit headers->mapinfo, etc)]
     17
     18edit ASCII file to have an azgcorr compatible header (first line must be as follows, then DEM data):
     19{{{
     20 -ed or c r xm ym xx yx gi : is the basic flat file ascii DEM definition
     21            : or = data order =0 rows S->N, =1 rows N->S
     22            : c = cols, r = rows, xm, ym = SW, xx, yx = NE corners
     23            : gi = grid increments; grid values separated by spaces
     24            : ** NB: for this definition georeferencing of the DEM grid is assumed
     25            :    to be at the CENTRE of the cell defined by the grid coordinates
     26            : ** if this is NOTthe case use option -edx, below
     27
     28 e.g.
     29    1 2000 2000 400000 850000 410000 860000 5
     30 N->s Xsize YSize Xmin Ymin   Xmax   Ymax   grid size (5m for nextmap)
     31}}}
     32
     33Use DEM with azgcorr -eh demfilename