I'm trying to create a hillshade surface from SRTM files downloaded form Earth Explorer, but the appearance is not the expected.
It has a grainy surface that I would like eliminate to have a smoothest surface. I'm running GRASS 6.4.3. to create this.
It happen mostly in coastal areas. I've tried to use r.denoise but the result is neither the expected, maybe isn't noise the cause of this.
If you need more info just ask.