[GRASS-user] NVIZ - Visualization of buildings

Hi everyone,
I'm trying to visualize a DEM that I've generated of the buildings of a
city. In each cell I have the meters of elevation. When I try to see it with
NVIZ I found that it makes something like interpolation, smoothing the
corners like it was a DEM of terrain instead of "hard edges" (i don't know
how to say it).

Anyone knows how could i get a correct visualization of the buildings?? It
would be very important to me getting it. I have the raster, and the
vectorial with the areas and the attribute.

Thanx!!
Andres
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On Fri, Oct 30, 2009 at 10:24 AM, incanus <andresfr@unizar.es> wrote:

Hi everyone,
I'm trying to visualize a DEM that I've generated of the buildings of a
city. In each cell I have the meters of elevation. When I try to see it with
NVIZ I found that it makes something like interpolation, smoothing the
corners like it was a DEM of terrain instead of "hard edges" (i don't know
how to say it).

For speed reasons, NVIZ is per default (typically) starting with a
reduced visualization.

To increase that:
Menu: Visualize -> Raster Surface -> Resolution | fine: XXX

The smaller XXX, the higher the shown resolution.
When XXX=1, then the full resolution as defined by g.region is
used.

Markus

On Sun, Nov 1, 2009 at 5:46 PM, Markus Neteler <neteler@osgeo.org> wrote:

On Fri, Oct 30, 2009 at 10:24 AM, incanus <andresfr@unizar.es> wrote:

Hi everyone,
I'm trying to visualize a DEM that I've generated of the buildings of a
city. In each cell I have the meters of elevation. When I try to see it with
NVIZ I found that it makes something like interpolation, smoothing the
corners like it was a DEM of terrain instead of "hard edges" (i don't know
how to say it).

For speed reasons, NVIZ is per default (typically) starting with a
reduced visualization.

To increase that:
Menu: Visualize -> Raster Surface -> Resolution | fine: XXX

The smaller XXX, the higher the shown resolution.
When XXX=1, then the full resolution as defined by g.region is
used.

Forgot to mention: some examples here (made without much efforts):

# only Lidar-based DSM + orthophoto:
http://gis.fem-environment.eu/

# Foto versus Lidar-based DSM + orthophoto (nviz)
http://gis.fem-environment.eu/gis-analysis/

cheers
Markus

Thanx to Markus I get this:

http://n2.nabble.com/file/n3943983/trozoNVIZ.png

As everyone can see, the "walls" are transparent. I've tried to resample the
color file to the resolution of the elevation file, and the result is the
same.
I would appreciate any comment os suggest about this, if someone had seen
something similar.

thanx,
Andres

Markus Neteler wrote:

On Sun, Nov 1, 2009 at 5:46 PM, Markus Neteler <neteler@osgeo.org> wrote:

On Fri, Oct 30, 2009 at 10:24 AM, incanus <andresfr@unizar.es> wrote:

Hi everyone,
I'm trying to visualize a DEM that I've generated of the buildings of a
city. In each cell I have the meters of elevation. When I try to see it
with
NVIZ I found that it makes something like interpolation, smoothing the
corners like it was a DEM of terrain instead of "hard edges" (i don't
know
how to say it).

For speed reasons, NVIZ is per default (typically) starting with a
reduced visualization.

To increase that:
Menu: Visualize -> Raster Surface -> Resolution | fine: XXX

The smaller XXX, the higher the shown resolution.
When XXX=1, then the full resolution as defined by g.region is
used.

Forgot to mention: some examples here (made without much efforts):

# only Lidar-based DSM + orthophoto:
http://gis.fem-environment.eu/

# Foto versus Lidar-based DSM + orthophoto (nviz)
http://gis.fem-environment.eu/gis-analysis/

cheers
Markus
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grass-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user

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Forget it! and thanx again Markus,
finally, I remember that in my DEM there was 0-values and null-values.
I replaced the null's by 0's and it works perfect!

incanus wrote:

Thanx to Markus I get this:

http://n2.nabble.com/file/n3943983/trozoNVIZ.png

As everyone can see, the "walls" are transparent. I've tried to resample
the color file to the resolution of the elevation file, and the result is
the same.
I would appreciate any comment os suggest about this, if someone had seen
something similar.

thanx,
Andres

Markus Neteler wrote:

On Sun, Nov 1, 2009 at 5:46 PM, Markus Neteler <neteler@osgeo.org> wrote:

On Fri, Oct 30, 2009 at 10:24 AM, incanus <andresfr@unizar.es> wrote:

Hi everyone,
I'm trying to visualize a DEM that I've generated of the buildings of a
city. In each cell I have the meters of elevation. When I try to see it
with
NVIZ I found that it makes something like interpolation, smoothing the
corners like it was a DEM of terrain instead of "hard edges" (i don't
know
how to say it).

For speed reasons, NVIZ is per default (typically) starting with a
reduced visualization.

To increase that:
Menu: Visualize -> Raster Surface -> Resolution | fine: XXX

The smaller XXX, the higher the shown resolution.
When XXX=1, then the full resolution as defined by g.region is
used.

Forgot to mention: some examples here (made without much efforts):

# only Lidar-based DSM + orthophoto:
http://gis.fem-environment.eu/

# Foto versus Lidar-based DSM + orthophoto (nviz)
http://gis.fem-environment.eu/gis-analysis/

cheers
Markus
_______________________________________________
grass-user mailing list
grass-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user

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