[GRASS-user] Creating raster from imported vector data

[Hamish]

mort wrote:
> In accordance to this book:
> http://www.gdf-hannover.de/lit_html/grass60_v1.2_en/node64.html
> I tried to convert isolines directly to surface using v.surf.rst:
> 
> v.surf.rst input=wysokosci2 layer=1 zcolumn=wysokosc_m
> dmax=1000.000000dmin= 825.000000 slope=slope2 zmult=1.0 tension=40.
> smooth=0.1 segmax=40 npmin=200
> 
> 
> and I get:
> 
> Warning: there are points outside specified region--ignored 128 points
> Warning: ignoring 27375 points -- too dense

  ^^^^^^^^^^^^^^^^^^^^^^^^

> WARNING: 39 points given for interpolation (after thinning) is less
> than given NPMIN=200
> Warning : there is less than 400 points for interpolation, no
> segmentation is necessary, to run the program faster, set segmax=400
> (see manual) Loading data from attribute table ...
> The number of points from vector file is 27542
> The number of points outside of region 128
> The number of points being used is 39
> 
> The output raster is one big yellow  square.


check the output region with g.region. Set the region so it contains all
points and the resolution to provide output of the same order density as
the input data.



Hamish