The mult parameter can be used to multiply the output raster cells by a common factor. Note that this parameter does not affect the output raster position or size; only the z-values are changed with this parameter.
Binary-output raster maps (solid circles of one value) can be created with the -b flag. Raster maps so created can be used to create binary filters for use in i.ifft (inverse Fourier transformations; apply filter with r.mask).
EASTCENTER=`g.region -c | awk ' /center easting:/ { print $3 }'` NORTHCENTER=`g.region -c | awk ' /center northing:/ { print $3 }'` r.circle output=circle coordinate=${EASTCENTER},${NORTHCENTER} max=300
EASTCENTER=`g.region -c | awk ' /center easting:/ { print $3 }'` NORTHCENTER=`g.region -c | awk ' /center northing:/ { print $3 }'` r.circle -b output=circle coordinate=${EASTCENTER},${NORTHCENTER} min=500 max=1000
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