Weeding Factors

Turning on Weeding Factors in the Add Breaklines dialog allows you to omit extraneous data from your surface. You will want to consider weeding when your breaklines contain a lot of vertices very close together. Each vertex is added to your surface as a point, so when you weed, your aim is to exclude extraneous point data. This not only reduces the size of your surface but helps to eliminate the formation of skinny triangles, which can produce saw-toothed contours.

Weeding requires that a distance and angle be entered in the Add Breaklines dialog. With these settings, the program will examine each vertex as follows:

1. It measures the length of the segment leading into the vertex.
2. It measures the length of the segment leaving the vertex.
3. If the sum of both lengths is less than the entered distance value, it checks the delta angle.
4. If the delta angle is less than the entered angle value, it omits the vertex.

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Creating Surfaces

• Creating a Surface with Point Groups
• Adding Breaklines
• Breakline Types
• Weeding Factors
• Supplementing Factors
• Adding Boundaries