I'm trying to create a Flow or directional raster map (with arrows) from an SRTM elevation map that I downloaded from CGIAR.
I already created an aspectMap to be used for the d.rast.arrow. I used the script:
d.rast.arrow map=aspectMap type=grass
and it only displayed a map that is solid green without any arrows.
I also tried the script:
d.rast.arrow map=aspectMap type=grass skip=50
and it displayed dots on the screen for every 50th cell. I already zoomed in to its max, but still I cannot see the arrows.
Is there a problem with my script? or is there an alternative way to create the arrows?