NVIZ - Visualization of buildings

[incanus]

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

[Markus Neteler]

On Fri, Oct 30, 2009 at 10:24 AM, incanus <[hidden email]> 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
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[Markus Neteler]

On Sun, Nov 1, 2009 at 5:46 PM, Markus Neteler <[hidden email]> wrote:

> On Fri, Oct 30, 2009 at 10:24 AM, incanus <[hidden email]> 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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[incanus]

Thanx to Markus I get this:



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 <[e-mail]> wrote:
> On Fri, Oct 30, 2009 at 10:24 AM, incanus <[e-mail]> 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 mailing list
[e-mail]
http://lists.osgeo.org/mailman/listinfo/grass-user

[incanus]

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:



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 <[e-mail]> wrote:
> On Fri, Oct 30, 2009 at 10:24 AM, incanus <[e-mail]> 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 mailing list
[e-mail]
http://lists.osgeo.org/mailman/listinfo/grass-user