| The ChannelSelection element specifies the false-color channel selection for
a multi-spectral raster source (such as a multi-band satellite-imagery
source). It is defined as:
<xs:element name="ChannelSelection">
<xs:complexType>
<xs:choice>
<xs:sequence>
<xs:element ref="sld:RedChannel"/>
<xs:element ref="sld:GreenChannel"/>
<xs:element ref="sld:BlueChannel"/>
</xs:sequence>
<xs:element ref="sld:GrayChannel"/>
</xs:choice>
</xs:complexType>
</xs:element>
<xs:element name="RedChannel" type="sld:SelectedChannelType"/>
<xs:element name="GreenChannel" type="sld:SelectedChannelType"/>
<xs:element name="BlueChannel" type="sld:SelectedChannelType"/>
<xs:element name="GrayChannel" type="sld:SelectedChannelType"/>
Either a channel may be selected to display in each of red, green, and blue,
or a single channel may be selected to display in grayscale. (The spelling
?gray? is used since it seems to be more common on the Web than ?grey? by a
ratio of about 3:1.) Contrast enhancement may be applied to each channel in
isolation. Channels are identified by a system and data-dependent
character identifier. Commonly, channels will be labelled as ?1?, ?2?,
etc.
author:
iant |