Contours
A variable can be plotted as contours by specifying the <resc:ContourSymbolizer> XML element. This requires one variable. It can contain the following tags:
| Tag name | Type of contents | Default value | Description |
|---|---|---|---|
<resc:NumberOfContours> |
Integer | 10 | The number of contour levels |
<resc:ContourLineColour> |
String specifying colour | #FF000000 (Black) | The colour of the contours. Ignored if the <resc:ContourPalette> is defined |
<resc:ContourPalette> |
String specifying colour palette to use | No colouring by value | The palette to use to colour the contours. |
<resc:ContourLineWidth> |
Integer | 1 | The width of the contour lines, in pixels. This is ignored for the "HIGHLIGHT" style |
<resc:ContourLineStyle> |
String | SOLID | The style of the contour lines. Three styles are available - "SOLID" (solid lines), "DASHED" (dashed lines), and "HIGHLIGHT" (lines surrounded by a contrasting colour). If "HIGHLIGHT" is used, the <resc:ContourLineWidth> parameter is ignored. |
<resc:Range> |
XML element | No default - must be specified | The scale range for the contours |
The <resc:Range> element contains the following tags similar to the <resc:Range> tag in the Segment function:
| Tag name | Type of contents | Default value | Description |
|---|---|---|---|
<resc:Minimum> |
Floating point number | Must be specified | The minimum of the range. |
<resc:Maximum> |
Floating point number | Must be specified | The maximum of the range. |
<resc:Spacing> |
String | linear | Whether the contours will be spaced linearly ("linear") or logarithmically ("logarithmic") |
It is possible to specify XML tags containing further styling information, but these are not currently supported and have no effect. An example of a specification for contours is:
<resc:ContourSymbolizer>
<se:Opacity>1.0</se:Opacity>
<resc:NumberOfContours>10</resc:NumberOfContours>
<resc:ContourLineColour>black</resc:ContourLineColour>
<resc:ContourLineStyle>SOLID</resc:ContourLineStyle>
<resc:ContourLineWidth>1</resc:ContourLineWidth>
<resc:Range>
<resc:Minimum>0.5</resc:Minimum>
<resc:Maximum>2.5</resc:Maximum>
<resc:Spacing>linear</resc:Spacing>
</resc:Range>
</resc:ContourSymbolizer>