This index is calculated using a 4 neighbour algorithm, diagonal cells are ignored when tracing a patch.
If the input raster map contains only NULL values then r.li.padrange
returns -1.
If you want to change these -1 values to NULL, run subsequently on the resulting map:
r.null setnull=-1 map=my_map
r.li.padrange map=my_map conf=my_conf output=my_out
Forest map (Spearfish sample dataset) example:
g.region rast=landcover.30m -p r.mapcalc "forests = if(landcover.30m >= 41 && landcover.30m <= 43,1,null())" r.li.padrange map=forests conf=movwindow7 out=forests_padrange_mov7 r.univar forests_padrange_mov7
Forest map (North Carolina sample dataset) example:
g.region rast=landclass96 -p r.mapcalc "forests = if(landclass96 == 5, 1, null() )" r.li.padrange map=forests conf=movwindow7 out=forests_padrange_mov7 # verify r.univar forests_padrange_mov7 r.to.vect input=forests output=forests feature=area d.mon x0 d.rast forests_padrange_mov7 d.vect forests type=boundary
Last changed: $Date: 2014-10-19 14:32:22 -0700 (Sun, 19 Oct 2014) $