[GRASS-user] How to: Symbology in maps using NVIZ?

[Anna Kratochvílová]

Hi,

consider using GRASS 7 because it includes v.colors, so you can set
different colors according to some attribute value. Nviz functionality
in GRASS 7 is integrated in wxGUI (select 3D view in Map Display). You
can use m.nviz.image for command line. In the nviz version you are
using, there should be 'thematic mapping' option for points (color,
symbol, size). In wxNviz, there is similar option also for line width.

On Mon, Mar 25, 2013 at 5:42 PM, Gregory Penn <gregory.penn at gmail.com> wrote:

> For the next step, I'd like to apply symbology to the vector layer.
> Specifically, I want to fill polygons with a specified color (high

sorry, it's possible to display only bounderies of 2D polygons (in all
versions), you could either try to display it as a raster or create
and display 3D polygons (by adding z coordinate to areas, but you
probably don't want this).

> priority), set layer-specific transparency (low priority), etc . . .. I

transparency is supported only for raster and 3D raster layers

> haven't been able to figure out how to do that, or even whether it's
> possible. I'm considering another way to accomplish this, by simply creating
> a 2d version of the map with the desired symbology in QGIS, exporting that
> as a raster, then using that file with the `color` parameter to nviz. That
> solution does not seem optimal, however.
>
>
> Eventually I'm working to use NVIZ to animate changes in the elevation
> surface as a time-series, but for now I'll be happy if I can get individual
> images with the desired look.

I suggest using m.nviz.image (you can set view, light, ... parameters
interactively in GUI and generate the m.nviz.image command from
toolbar) or you can play with the new animation tool in GRASS 7.


Anna