asking for a lot of grass advice

[Bruce Byars]

Hi Rob,

My answers are below your questions.  However, if you like, go ahead and

give me a call at the office.  We worked with a couple of very similar
projects
to the one I think you are describing.   My number is 254-710-6814

Bruce

--
Bruce Byars
Hydrologist and Senior Research Scientist
CAGSR - GRASS Dev. Team - Baylor University

>  I am considering developing a package that will calculate signal
> reception for specific stations using the Longley Rice Irregular
> Terrain Model.  I need vector-topo data for the entire country.
>
> First, do you have to use vector data?  Can you use rasters and then
> script up r.mapcalc,
> r.los, and r.binfer to perform your analysis?  Raster data may be
> easier to work with from
> your description.  Vector topo map for the entire country will be
> BIG.  Gigabytes.  We already
> have the US DEM's assembled, rectified, and cleaned up and at 90m grid
> resolution the DEM
> is about 2 gigabytes (raster data...I'll calcualte the vector for you
> tomorrow).
>
>  -------------------------------------------------------1.  What are
> my options this data?  I suppose that I should use the DEM data from
> USGS?
>
> You can produce vector data from the USGS DEM data without any problem
> using the
> r.poly tool.
>
>
> ----------------------------------------------------------------------------------- 2.
> Are there C or Perl libraries for working with DEM's?  Specifically,
> to use Longly Rice, I have to resample the vector data to generate an
> elevation profile between two arbitrary points from the vector-topo
> data.  Any ideas on that either?
> Personally, I think you will be better off cutting raster transects.
> Tools are already in GRASS
> to do this.
>
> ---------------------------------------------------------
>  3.  When I am done I my data will be <long>,< lat>,<reception index>;
> which I plan on treating as a height field.  What Grass tools can I
> use to create an image from height field data. You can create a raster
> "elevation" map of your surface with no problem.  To create
> nice visualizations, use NVIZ or possibly d.3d
>
>
> ------------------------------------------------------------------------------------
>
> 4.  Also, are there any books out there to jumpstart someone who knows
> things like MapInfo, and Linux, but not Grass??
>
> We have a brand new tutorial that will be ready this week.
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