[Maplab-dev] [Bug 231] [SECTStudio-Classifier] Feature Type Raster Classification not valid
Mon, 23 Feb 2004 13:08:34 -0500

------- Additional Comments From  2004-02-23 13:08 -------
There is still something unclear for me in the specs. Here is how the SLD looks

<ColorMapEntry color="#00ff00" quantity="-500"/>
<ColorMapEntry color="#00fa00" quantity="-417"/>
<ColorMapEntry color="#14f500" quantity="-333"/>
<ColorMapEntry color="#28f502" quantity="-250"/>
<ColorMapEntry color="#3cf505" quantity="-167"/>
<ColorMapEntry color="#50f50a" quantity="-83"/>
<ColorMapEntry color="#64f014" quantity="-1"/>

Here is what is specified in the specs :

For example, a DEM raster giving elevations in meters above sea level can be
translated to a colored image with a ColorMap. The quantity attributes of a
color-map are used for translating between numeric matrixes and color rasters
and the ColorMap entries should be in order of increasing numeric quantity so
that intermediate numeric values can be matched to a color (or be interpolated
between two colors).

 It seems that the specs expect to work on range of values for classification
and not on descrete values. (In the example above we would have pixel >= 500 and
pixel < 417 as a first class) There were a couple of e-mails sent to the ogc
mailing lists but no answer to clarify this.

 It  is not a big deal to generate the sld but we have to make a descision on
this issue.

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