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PBRK Strings

The PBRK string is a point string containing only null elevation points and given the name PBRK. Normally, null elevation points are ignored during the building of a triangulation, but the points of the PBRK string are included in the calculation process.

Prior to generating a triangulation, an area of a model can be excluded from subsequent analysis such as contours by use of a PBRK string. The PBRK string is provided specifically for this purpose. Any resulting triangles which have a null elevation at one or more vertices are excluded for the purpose of subsequent analysis of contours, flow arrows etc. Therefore the inside of a building can be excluded by the inclusion of a single PBRK string point near the buildings centroid.

New Hampshire Department of Transportation
PO Box 483  |  7 Hazen Drive  |  
Concord, NH  |  03302-0483
Tel: 603.271.3734  |  Fax: 603.271.3914