grdclip − Clipping of range in grdfiles.
grdclip input_file.grd −Goutput_file.grd [ −Sahigh/above ] [ −Sblow/below ] [ −V ]
grdclip will set values < low to below and/or values > high to above. Useful when you want all of a continent or an ocean to fall into one color or grayshade in image processing, or clipping of the range of data values is required. above/below can be any number or NaN (Not a Number). You must choose at least one of −Sa or −Sb.
input_file.grd
The input 2-D binary grdfile.
−G |
output_file.grd is the modified output grdfile. |
−Sa |
Set all data[i] > high to above. |
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−Sb |
Set all data[i] < low to below. |
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−V |
Selects verbose mode, which will send progress reports to stderr [Default runs "silently"]. |
To set all values > 70 to NaN and all values < 0 to 0 in file data.grd, try:
grdclip data.grd −Gnew_data.grd −Sa70/NaN −Sb0/0 −V
gmt(1gmt), grdlandmask(1gmt), grdmask(1gmt), grdmath(1gmt), grd2xyz(1gmt), xyz2grd(1gmt)