Thanks for the response Simone.
So if someone else is facing this issue, i sugest to use two Rules, the
first legend with the correct values and labels, and a second Rule with the
unsigned values.
You can use two Rules to represent these values. The corresponding value
for Signed -1 is the Unsigned 255. So you define the -1 on the first Rule,
and the 255 on the second Rule as the following sld example.
<?xml version="1.0" encoding="UTF-8"?><sld:StyledLayerDescriptor xmlns="
http://www.opengis.net/sld"; xmlns:sld="http://www.opengis.net/sld"; xmlns:gml
="http://www.opengis.net/gml"; xmlns:ogc="http://www.opengis.net/ogc"; version
="1.0.0">
<sld:NamedLayer>
<sld:Name>Default Styler</sld:Name>
<sld:UserStyle>
<sld:Name>Default Styler</sld:Name>
<sld:Title>Biodiversity Conservation Priorities</sld:Title>
<sld:FeatureTypeStyle>
<sld:Name>biodiversity_conservation_priorities_1</sld:Name>
<sld:Rule>
<sld:RasterSymbolizer>
<sld:ChannelSelection>
<sld:GrayChannel>
<sld:SourceChannelName>1</sld:SourceChannelName>
</sld:GrayChannel>
</sld:ChannelSelection>
<sld:ColorMap type="values">
<sld:ColorMapEntry color="#B2B2B2" opacity="1" quantity="-1" label=
"-1"/>
</sld:ColorMap>
</sld:RasterSymbolizer>
</sld:Rule>
<sld:Rule>
<sld:RasterSymbolizer>
<sld:ChannelSelection>
<sld:GrayChannel>
<sld:SourceChannelName>1</sld:SourceChannelName>
</sld:GrayChannel>
</sld:ChannelSelection>
<sld:ColorMap type="values">
<sld:ColorMapEntry color="#B2B2B2" opacity="1" quantity="255" label=
"255"/>
</sld:ColorMap>
</sld:RasterSymbolizer>
</sld:Rule>
</sld:FeatureTypeStyle>
</sld:UserStyle>
</sld:NamedLayer>
</sld:StyledLayerDescriptor>
2016-06-17 10:34 GMT-03:00 Simone Giannecchini <
[email protected]>:
> Dear Danilo,
> I am pretty sure this is the case.
>
> We'll have to think about to handles this case as this goes down to
> the low level number crunching machinery.
>
> I see you have opened a JIRA eventual work will be tracked on it.
>
> Regards,
> Simone Giannecchini
> ==
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> On Thu, Jun 16, 2016 at 6:46 PM, Danilo da Silveira Figueira
> <[email protected]> wrote:
> > Hi all,
> >
> > When i submit a map using 8bit as a GeoTiff, the geoserver always
> interprets
> > this map as unsigned. So the interval between -128 to -1 is interpreted
> as
> > 128 to 255.
> >
> > The issue i guess that the geoserver doesn't care about the Gdal Byte
> > special flag as described, a example of how fix the problem:
> > http://pastebin.com/qmMeAhPj
> >
> >
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