Thank you so much, Simone. The polygon styling link is very helpful. I
copied their sample and edited it a bit for my needs and it actually gave
me different colors. This is great and I could probably just use this to
get what I need. If I had a magic wand though, I might go one step further
and figure out how to get a true gradient for my range of values. I
suppose I could always have 100 different ranges that get colored in my
rules, but its a bit tedious - and I worry that it might evaluate a bit
more slowly. That concern may not be valid though.
Anyway - thanks a lot for the tip!. Let me know if you see any other
options for enhancement.
- Jeremy
On Tue, Feb 25, 2014 at 6:21 AM, Simone Giannecchini <
simone.giannecch...@geo-solutions.it> wrote:
> Ciao Jeremy,
> please, find my answer inline below...
>
>
>
> Regards,
> Simone Giannecchini
> ==
> Our support, Your Success! Visit http://opensdi.geo-solutions.it for more
> information.
> ==
>
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> @simogeo
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>
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> -------------------------------------------------------
>
>
> On Wed, Feb 19, 2014 at 9:55 PM, Jeremy Lindsey <lind...@mosaicatm.com>wrote:
>
>> Hello,
>>
>> I'm working on a project that has gridded weather data, stored in a
>> postgis database. The database isn't really doing anything special with
>> it, just entering one record (including a geometry column) for each cell in
>> the grid. For hi-resolution weather information, this means that it can
>> produce a large number of records.
>>
>> Until now, we have been using WFS to filter and retrieve the regions that
>> we want and draw the results in our OpenLayers based web interface. We
>> have javascript code that sets the color for each small polygon based on
>> the value of another attribute of each feature. For one example, this
>> could be percentage likelihood of precipitation or other weather. The end
>> result basically looks like a heat map with higher percent regions having a
>> more intense color than the lower percentage areas.
>>
>> As I mentioned though the dataset and be quite large. Unless you are
>> filtering down to a pretty small area, then the query and rendering just
>> takes too long. So the last couple days I've been experimenting with
>> retrieving the data as a WMS layer instead of a WFS/vector layer. The
>> results are promising. The data is properly filtered and returns much
>> faster. (I beleive this is because its just returning a fixed 256x256
>> image that does not need to grow in size like the raw WFS/GML would). The
>> only problem is I can't figure out how to color it properly. By default,
>> it was using the red point style and it all returned red. I tried other
>> raster based styles, but since my data was not truly returned as raster, it
>> failed (at least I assume that is why it failed).
>>
>
> If I got this right, you should use vector styles not raster styles. Your
> data is vector data not raster data.
> One question the geometry is a polygon or a point? I guess it should be a
> polygon.
> Check this page for reference:
>
> http://docs.geoserver.org/stable/en/user/styling/sld-cookbook/polygons.html
>
> It contains a lot of info on Polygon styles.
>
> It might be of interest to use the CSS extension for styling:
> http://docs.geoserver.org/latest/en/user/extensions/css/cookbook.html
>
>
>
>>
>> I then came across the vector-to-raster based heatmap style that could be
>> applied via WPS. I installed the extension and tried the gs:heatmap as
>> explained here:
>>
>>
>> http://docs.geoserver.org/stable/en/user/styling/sld-extensions/rendering-transform.html
>>
>> I made a couple adjustments to fit my schema and gridval values (between
>> 50 and 100) and assigned some random colors. It does not throw any
>> exceptions, but I also do not see any colors showing up on my map. I have
>> attached the style definition that I'm currently trying to use.
>>
>>
> Thinking, it might be that the output values are too close to 0 and they
> come out as white. Try to replace your RasterSymbolizer with this one:
>
> <RasterSymbolizer>
> <!-- specify geometry attribute to pass validation -->
> <Geometry>
> <ogc:PropertyName>geom</ogc:PropertyName></Geometry>
> <Opacity>1.0</Opacity>
> <ColorMap type="ramp" >
> <ColorMapEntry color="#000000" quantity="0" label="black"/>
> <ColorMapEntry color="#FFFFFF" quantity="100"
> label="white" />
> </ColorMap>
> </RasterSymbolizer>
>
> If the values are ok (which means the transformation is applied correctly)
> they should come out as grayscale (the rastersymbolizer by default applies
> a linear ramp).
>
>
> Let us know how it goes.
>
>
>
>> As you have probably guessed, a lot of these concepts are still pretty
>> new to me. I'd appreciate any tips that any of you might have to help me
>> figure this out.
>>
>> Thanks!
>>
>> Jeremy
>>
>>
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