I use this layer to get elevation data and generate a 3d mesh on client side.
Now, I use this style :
<ColorMapEntry color="#000000"
quantity="0"/>
<ColorMapEntry color="#0000ff"
quantity="255"/>
<ColorMapEntry color="#000100"
quantity="256"/>
<ColorMapEntry color="#0001ff"
quantity="511"/>
<ColorMapEntry color="#000200"
quantity="512"/>
<ColorMapEntry color="#0002ff"
quantity="767"/>
<ColorMapEntry color="#000300"
quantity="768"/>
<ColorMapEntry color="#0003ff"
quantity="1023"/>
<ColorMapEntry color="#000400"
quantity="1024"/>
So, on client side, I can read the pixel RGB value and compute elevation value :
For example :
- pixel color is #0001ba
=> elevation value is 0x0001ba
=> elevation value is 442
And retrieve my elevation values with maximum precision (but the elevation map
is very ugly to see).
Then I use another layer to get a texture to put on my mesh, and the result is
fine !
By the way, the difficulty is that the client software is a browser 3d plugin,
and I can easily process only bitmap data, processing other data need a lot of
work.
Regards,
Aurelien
-----Message d'origine-----
De : [email protected] [mailto:[email protected]] De la part de Andrea
Aime
Envoyé : lundi 27 juin 2011 20:48
À : ALBERT Aurélien
Cc : Simone Giannecchini; Mike; [email protected]
Objet : Re: RE : [Geoserver-users] GeoServer with elevation data
On Mon, Jun 27, 2011 at 8:02 PM, ALBERT Aurélien
<[email protected]> wrote:
> I use Geoserver 2.0.2
>
> I tried following styles :
>
> <ColorMap extended="true">
> <ColorMapEntry color="#000000" quantity="-500" label="nodata"
> opacity="0.0" />
> <ColorMapEntry color="#000000" quantity="-100" label="values"
> opacity="1.0" />
> <ColorMapEntry color="#00FFFF" quantity="100" label="values"
> opacity="1.0" />
> </ColorMap>
>
> <ColorMap extended="true">
> <ColorMapEntry color="#000000" quantity="-500" label="nodata"
> opacity="0.0" />
> <ColorMapEntry color="#000000" quantity="-100" label="values"
> opacity="1.0" />
> <ColorMapEntry color="#FFFFFF" quantity="100" label="values"
> opacity="1.0" />
> </ColorMap>
>
> I was expecting, for data range -100 to 100, to get pixel colors from #000000
> to #00FFFF :
>
> #000001
> #000002
> #000003
> #000004
> ...
> #0000FF
> #0001FF
> #0002FF
> #0003FF
> ...
> #00FFFF
In order to get from fully black to cyan you expect the ramp to pass
by solid blue?
It makes some sense, but not sure how that could be coded.
What you get is the simplest color ramp implementation, linearly interpolate all
color component from first to second color.
Getting a random gradient generator from the net you get exactly the same
behavior:
http://tools.dynamicdrive.com/gradient/
If you want to go through blue you have to configure it as the value for 0,
then you'll get from white to solid black to solid blue, and then from blue
to cyan.
Out of curiosity, what kind of application generates gradients the way
you'd expect?
Cheers
Andrea
--
-------------------------------------------------------
Ing. Andrea Aime
GeoSolutions S.A.S.
Tech lead
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 962313
http://www.geo-solutions.it
http://geo-solutions.blogspot.com/
http://www.youtube.com/user/GeoSolutionsIT
http://www.linkedin.com/in/andreaaime
http://twitter.com/geowolf
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