Apply Feature Layer to TIN

You can apply objects digitized on a feature layer to a TIN for the following purposes:

• to remove TIN lines that extend over land areas (islands or coastlines) or data holidays,

• to extend the TIN to natural boundaries, such as coastlines, or

• to supplement the TIN with data of known elevation.

You can apply three types of objects to a TIN model: coverage areas (acronym cvrage), soundings (acronym SOUNDG) and breaklines (acronym brklne).

• A coverage object (cvrage) cuts the TIN and is used to control the limits of the TIN model based on physical boundaries such as coastlines, islands, or other physical structures. Coverage objects are always areas.

• A sounding object (SOUNDG) inserts a single known elevation into the TIN using the value of the SOUNDG feature.

• A breakline object (brklne) is used to insert known elevations into the TIN. When applying breaklines, the application will look for the breaklineobjects.xml file, located in

C:\Program Files\CARIS\BASE Editor\<version>\modules\BASE Editor\support

This file lists the types of objects that the application will apply to the TIN. By default, three feature types are listed: brkline, DEPCNT, and COALNE. Breakline objects can be either line or area objects. For example, a breakline could be digitized along a portion of a coastline, with the depth attribute (VALDCO) set to zero metres, located where it is feasible to have the model extend fully to the shoreline. Once a breakline object is applied to the TIN, the model includes the vertices of the breakline and the values of their depth attributes, extending the coverage of the TIN to the shoreline. This is one of the important steps in building a true shore-to-shore model, with correct elevation, when the bathymetry does not extend to the shoreline.

Related commands:

Interface

The Apply Feature Layer command uses the following dialog box.

Procedure

1. Create a feature layer. See Create Feature Layer for instructions.

2. Digitize a line or area feature with either the cvrage or brkline object acronym.

If you choose to digitize a breakline object, assign an appropriate attribute value for the depth of contour (VALDCO). Multiple coverage and breakline line and area objects can be digitized on the same feature layer.

3. Select the relevant TIN Editor layer in the Layers window.

4. Select the Apply Feature Layer command.

5. Select the feature layer containing the newly digitized feature object.

6. Click OK.

The breakline, coverage and sounding objects on the feature layer are applied to the TIN.