I think an example is more than self explaining about the usage.
The following
- prints to console the values of the active region
- uses the GRASS command g.region to change the resolution to 20 meters (as you can see it was 40 before)
- updates the script's variables region values to the new set (very important)
- prints out the new active region values
println "n = " + NORTH()
println "s = " + SOUTH()
println "e = " + EAST()
println "w = " + WEST()
println "xres = " + WERES()
println "yres = " + NSRES()
println "rows = " + ROWS()
println "cols = " + COLS()
grass g.region.exe res = 20
updateActiveregion()
println "n = " + NORTH()
println "s = " + SOUTH()
println "e = " + EAST()
println "w = " + WEST()
println "xres = " + WERES()
println "yres = " + NSRES()
println "rows = " + ROWS()
println "cols = " + COLS()
My example result is:
n = 5204514.51713
s = 5141634.51713
e = 686136.82243
w = 601576.82243
xres = 40.0
yres = 40.0
rows = 1572
cols = 2114
Updated active region...
n = 5204514.51713
s = 5141634.51713
e = 686136.82243
w = 601576.82243
xres = 20.0
yres = 20.0
rows = 3144
cols = 4228
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