[GRASS-dev] wxGUI GRASS 7: how to drape a map over a DEM?

[Anna Petrášová]

On Sun, May 26, 2013 at 10:50 AM, Markus Neteler <neteler at osgeo.org> wrote:

> On Sun, May 26, 2013 at 10:32 AM, Anna Petrášová <kratochanna at gmail.com>
> wrote:
> ...
> > ok, I get it. You shouldn't load flowacc as a layer because than it is
> > displayed as another surface which we don't want in this case. Or when
> it is
> > loaded (when 2D) just uncheck it and adjust the view to see the DEM.
>
> OK - since  I come in the exercise from the 2D view, this may do the trick.
> So, in essence, all maps active in the Layer Manager will be treated
> as elevation layers in wxNVIZ (?).
>

yes, loaded raster map = surface

>
> > Then,
> > go to the Data -> Surface -> Surface attributes and change color to
> flowacc.
> > This should be  the same concept as for the old nviz or not? BTW, it's in
> > the video tutorial:)
>
> The old NVIZ I rigorously started from CMD line :-)
>
> nviz elev=elevation colo=flowacc
>
> > The problem why you don't see anything when you load both maps is that
> > flowacc has large extreme values, so the initial view is confused.
>
> Indeed, I am surprised (extra unrelated issue) that flowacc has this
> range:
>
> r.univar flowacc
>  100%
> total null and non-null cells: 525000
> total null cells: 0
>
> Of the non-null cells:
> ----------------------
> n: 525000
> minimum: -253898
> maximum: 15278.2
> range: 269176
> mean: -275.776
> mean of absolute values: 311.452
> standard deviation: 4199.2
> variance: 1.76333e+07
> variation coefficient: -1522.69 %
> sum: -144782397.558392
>
> > Anyway
> > you should be able see something when you adjust the view to some normal
> > height.
>
> Thanks, Anna. I'll get to speed with it for sure.
>

you're welcome


> Markus
>
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