edit grid topography.
This program can edit the topography of input grid_spec file "orig_grid"
according to the ascii input file "grid_edits". Then it will output the
new grid_spec file "mod_grid". The program read file "grid_edits" line
by line. Each line contains grid points position and new topography value
of those grid points. The grid points position is specified by the grid
index. You can specify a point or a region at each line. For example,
100, 60, 0
will set the depth at point (100,60) to 0.
40:45, 30:34, 1000
will set the depth at region ( index i from 54 to 50 and j from 30 to 34 ) to 1000.
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