[GRASS-user] NED Shaded Relief, Grass 6.4

Hello Folks,

I am trying to create a shaded relief map based on a 30-meter NED file using r.shaded.relief. The results are very ‘blocky’ (or stair-stepped). Running a 5-cell average neighborhood across the DEM did not help. Can somebody tell me the correct procedures I should follow to create the relief map that is smooth?

I’ve put a screenshot of my initial shaded relief map up here to show you what I’m talking about…
http://www.rlogis.com/GMaps/test/grass64_shadrel.jpg

Thank You Much.

Tripp Lowe

Tripp,

On Sat, Apr 11, 2009 at 8:05 AM, Tripp Lowe <tripplowe@gmail.com> wrote:

Hello Folks,

I am trying to create a shaded relief map based on a 30-meter NED file using
r.shaded.relief. The results are very 'blocky' (or stair-stepped). Running
a 5-cell average neighborhood across the DEM did not help. Can somebody tell
me the correct procedures I should follow to create the relief map that is
smooth?

I've put a screenshot of my initial shaded relief map up here to show you
what I'm talking about...
http://www.rlogis.com/GMaps/test/grass64_shadrel.jpg

did you run
g.region rast=your_ned_map -p

before
r.shaded.relief
? I suspect that your current region is of lower resolution right now.

Markus