R: [GRASS-windows] elevation data error?

[Marco Pasetti]

Hi Simon,

I didn't read the mail carefully :-)

>when I first load the layer it shows in the map display as a single colour block

it's not a NVIZ problem, but a raster problem. Try to import again with r.in.gdal or try with r.in.arc
If not succesfull, try to download SRTM v3 data from http://srtm.csi.cgiar.org/

Regards

Marco
  ----- Original Message ----- 
  From: Simon Watkins 
  To: marco.pasetti at alice.it ; grass-windows at lists.osgeo.org 
  Sent: Monday, June 09, 2008 6:26 PM
  Subject: Re: R: [GRASS-windows] elevation data error?


  Hi Marco,

  Thanks for your very prompt reply.  I just tried that but no luck alas.  It seems to me like this is being treated as a 2D raster with no elevation data but I guess  I don't really know enough about formats and such yet.  This is only a personal project, with no real urgency about it so I'll just keep plugging away and hope I figure it out.

  Simon.


  On Mon, Jun 9, 2008 at 9:36 AM, <marco.pasetti at alice.it> wrote:

    Hi Simon,

    did you set the z-exag parameter?
    Since lat/long data are in decimal degrees while elevation is in meters, you must set the correct value for the z-exag parameter.
    The transformation from decimal degrees to meters is not univocal, because it depends on the geographic zone you're working on, but we can assume a generic (mean)transformation value and set the z-exag as follows:

    in the z-exag field type 8.9606e-6 and then enter

    I hope this helps,

    Marco

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