NAME
r.surf.xy - GRASS module to produce two raster maps for use with r.mapcalc. One file contains the x-coordinates of each raster map cell, the
other, the y-coordinates.
Usage:
r.surf.xy x=name y=name
Parameters:
x Name of the new raster map layer to hold x coordinate values
y Name of the new raster map layer to hold y coordinate values
These two cell files can be used to produce mathematical functions in the
form:
z = fn(x,y)
This is required as r.mapcalc does not provide variables which hold
the current x and y coordinates of the moving window. Use these maps in
calculations which are coordinate dependent.
NOTE:
x and y values are in RELATIVE coordinates to an origin of (0,0) at
the bottom left corner. To transfrom back to georeferenced coordinates
use r.mapcalc to add the relative offset to the origin.
SEE ALSO
r.mapcalc
jwo@le.ac.uk
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