Hi List,
I would like to create a new "colormap" community module to deal with
https://jira.codehaus.org/browse/GEOS-6184.
Summarizing the aim of this module:
-----------------------------------------------------
A Process will take care of rendering a coverage on top of a specified
colorMap.
Such a ColorMap will be "Dynamic" since the processing code will adapt the
colors to the actual values range of a layer (through a linear stretch)
keeping, as an instance, MIN layer value = BLUE and MAX layer value = RED.
Moreover, previously computed statistical metadata through gdalinfo are
supported and may be exposed through a RenderingTransformation to retrieve
the range. (Gdalinfo auxiliary metadata parsing has been already supported
on GeoTools ImageMosaic: See linked JIRA on GEOS-6184).
colormaps may be defined:
- as a list of explicit RGB values (In that case, the colors will be
equidistant along the range)
- as a reference to a QuantumGIS SVG gradient file (which also define
percentages of the range). See an example here:
https://github.com/qgis/QGIS/blob/master/resources/cpt-city-qgis-min/cb/seq/Blues_03.svg
Finally, a dispatcherCallback will be defined to intercept a
getLegendGraphics involving a renderingTransformation based on that
process. It will dynamically setup the legend for the specific layer (also
parsing any dimension provided in the request, such as time, elevation, ...
since statistics change across different slices of a multidimensional
coverage).
---------------------------------------------------------
I would like to contribute that module to the community.
Please, let me know.
Best Regards,
Daniele
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Ing. Daniele Romagnoli
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