r.surf.xy

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.

SYNOPSIS

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.

NAME

SYNOPSIS

Parameters:

NOTE

SEE ALSO