CARIS HPD : Support Files : Mapping : Geometry Mapping : Geometry Mapping
 

Geometry Mapping

The Geometry_Mapping_Examples.xml file uses the <ConvertGeometry/> function to map geometry for individual features. These conversion options are available:

• Area-to-point (position is calculated from centre of area)

• Area-to-edge (uses the area boundary lines)

• Area-to-text (position is calculated from centre of area)

• Sounding-to-point

• Text-to-point

• Point-to-text.

This is an example of geometry conversion from a land area feature to a coastline feature.

<Object Acronym="LNDARE">

  <Filter>

    <PrimitiveIsEqualTo Primitive="Area" />

  </Filter>

  <MapObject>

    <MapObjectAcronym Acronym="COALNE"/>

    <ConvertGeometry Primitive="Line"/>

    <OutputMessage Value="Area-to-Line Geometry Mapping Example." />

    <CopyConvertibleAttributes/>

  </MapObject>

</Object>

The land area (LNDARE) feature is converted to a coastline feature using <ConvertGeometry/> to change the feature from an area to a line.

This example creates a text feature from an area feature in a VPF file.

<Object Acronym="AL020_area">

  <Filter>

     <PrimitiveIsEqualTo Primitive="Area"/>

  </Filter>

  <MapObject>

    <ConvertGeometry Primitive="Text" Value="Area to Text"/>

    <MapObjectAcronym Acronym="ZD040"/>

    <CopyConvertibleAttributes />

  </MapObject>

</Object>

The area feature is converted using <ConvertGeometry/>. The text to be displayed is set through the Value attribute. In this example, the text is Area to Text.

An attribute value can also be used for text content:

<Object Acronym="AL020_point">

  <Filter>

    <PrimitiveIsEqualTo Primitive="Point"/>

  </Filter>

  <MapObject>

    <ConvertGeometry Primitive="Text" Acronym="NAM"/>

    <MapObjectAcronym Acronym="ZD040"/>

    <CopyConvertibleAttributes />

  </MapObject>

</Object>

A point feature is converted to a ZD040 text feature. The text is read from the NAM attribute and is displayed in the chart.