To be more specific. I'm looking for a way to use a color map for vector
data with WMS. Any ideas?
On Thu, Feb 20, 2014 at 3:44 PM, Jeremy Lindsey <lind...@mosaicatm.com>wrote:
> OK, I seem to be getting color now. I was basing my weights on the
> 50-100, but I just discovered in the docs that heatmap wants 0-1. So I
> made some changed the color map, though I'm not sure that then maps
> properly to my values. I do however get a heatmap to show up - which
> illustrated to me the fact that I probably don't want a heatmap (it
> radiates outside of my filter region, among other problems). Is there
> another method that would provide a 1-to-1 mapping of feature geometry to
> color, without changing where things are drawn?
>
>
> On Wed, Feb 19, 2014 at 3:55 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).
>>
>> 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.
>>
>> 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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