Hi all,
Recently I have started working on bindings for se 1.1 in order to implement
a paser/encoder for se 1.1 and sld 1.1. I have a question regarding color
maps.
In SLD 1.0 a color map is defined as:
<xsd:element name="ColorMap">
<xsd:annotation>
<xsd:documentation> A "ColorMap" defines
either the colors of a pallet-type raster source or
the mapping of numeric pixel values to colors.
</xsd:documentation>
</xsd:annotation>
<xsd:complexType>
<xsd:choice minOccurs="0" maxOccurs="unbounded">
<xsd:element ref="sld:ColorMapEntry"/>
</xsd:choice>
</xsd:complexType>
</xsd:element>
In SE 1.1 a color map is defined as:
<xsd:complexType name="ColorMapType">
<xsd:choice>
<xsd:element ref="se:Categorize"/>
<xsd:element ref="se:Interpolate"/>
</xsd:choice>
</xsd:complexType>
<xsd:complexType name="CategorizeType">
<xsd:complexContent>
<xsd:extension base="se:FunctionType">
<xsd:sequence>
<xsd:element ref="se:LookupValue"/>
<xsd:element ref="se:Value"/>
<xsd:sequence maxOccurs="unbounded" minOccurs="0">
<xsd:element ref="se:Threshold"/>
<xsd:element ref="se:Value"/>
</xsd:sequence>
</xsd:sequence>
<xsd:attribute name="threshholdsBelongTo"
type="se:ThreshholdsBelongToType" use="optional"/>
</xsd:extension>
</xsd:complexContent>
</xsd:complexType>
<xsd:complexType name="InterpolateType">
<xsd:complexContent>
<xsd:extension base="se:FunctionType">
<xsd:sequence>
<xsd:element ref="se:LookupValue"/>
<xsd:element maxOccurs="unbounded"
ref="se:InterpolationPoint"/>
</xsd:sequence>
<xsd:attribute name="mode" type="se:ModeType"/>
<xsd:attribute name="method" type="se:MethodType"/>
</xsd:extension>
</xsd:complexContent>
</xsd:complexType>
Quite a different structure. My question is what sorts of objects this
should be parsed into. The ColorMap class as it exists seems more or less
just a list of color entries, mirroring the sld 1.0 structure. But I also
found a few classes living in the render package that mirror the SE
structure:
org.geotools.filter.visitor.Categorize
org.geotools.filter.visitor.Interpolate
These two are interfaces that extend Function but seem to have no
implementation. However these two classes:
org.geotools.filter.CategorizeFunction
org.geotools.filter.InterpolateFunction
Which seem to be related, although the classes don't implement the
interfaces, they are direct implementations of Function.
So... i am not sure what to do. Should I try to mash the new concepts into
the existing ColorMap class... or should i try to use these new classes? I
see Jody's name riddled on a few of those classes so hopefully he or others
more familiar with se can provide some context.
Thanks!
-Justin
--
Justin Deoliveira
OpenGeo - http://opengeo.org
Enterprise support for open source geospatial.
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