[GRASSLIST:8232] Re: r.shaded.relief looks terrible

[Hamish]

> I am trying to produce a shaded relief of an an area of low hills,  
> and I am getting very strange results.  When I zoom in on the  
> resulting shaded relief, it looks fine.  When I zoom out, however, it 
> looks terrible on the screen.  It looks like a grey area with white  
> and black lines running through it, like noise.  Interestingly, if I  
> zoom in, take a screen capture, open the screen capture in a graphics 
> program and zoom out, it looks great.  So I think that  
> r.shaded.relief is doing the right thing, but that the interpolation  
> in the GRASS display monitor is really making it look terrible.  The  
> funny thing is, I have done this before on this same area and did not 
> have this problem.  That was, however, using an older version of  
> GRASS.  It's very difficult to explain this w/o graphics.  Please let 
> 
> me know if I should email graphics.


Perhaps you are seeing an interference pattern due to a noise signal in
the base data?



Hamish