[GRASSLIST:7745] Re: Raster Resolution (help requested)

[Hamish]

> In the past I have worked mainly with RASTER layers in GRASS and they

> just worked (some how). Now I am working alot with vectors in GRASS. 
> For instance I have a region that was created througha v.in.ogr. Now 
> when I bring in the coresponding raster maps they are verry blocky 
> unless I view them from a far out zoom. My region settings are
>
> projection: 0 (x,y)
> zone:       0
> north:      44.86371257
> south:      44.67956501
> west:       -76.34802196
> east:       -76.08834984
> nsres:      0.00920738
> ewres:      0.01298361
> rows:       20
> cols:       20
>
> I created a DEM from contour lines (v.surf.rst) and the results are
> undesireable due to the chopyness of the raster. for instance instead

> of smooth DEM I have lakes that contain one or two raster cells. The 
> same area would contain MANY contour lines. Cheers
>
> A quick explanantion of what I've done and how to increase the 
> resolution of the rasters in my project would be appreciated.

Increase the resolution in a lat/lon location to 1-arcsec with:

g.region res=00:00:01

(degree:min:sec)
then check the number of rows and columns you have. Set as needed, but
for a crisp display on the screen you will want to at least match the
screen resolution, ie 1000x1000 or so.

Hamish



		
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