| KBA-01009-G8L3T4 |
| Purpose & Scope |
| Modify LP360 Settings to Avoid Large Surface Voids |
| Procedure |
| Surface exports with large void areas such as lakes or other water bodies may require changes to the default export settings. LP360 makes inspections of the neighborhood adjacent to small processing blocks in order to correctly identify the right set of points to triangulate for creating surfaces. This process is called locating the critical surface points (CSP).A set of CSP is a set of points around a rectangular area where no other points added to the surface outside the convex hull created by the CSP’s will modify the TIN inside the rectangular area.
In order to locate the CSP’s for any given rectangular area, a neighborhood must be defined around the area. This is called the thin extent width and height. By default, these values are set to 1000X1000. Meaning that LP360 will increase the rectangular area by 1000X1000 map units in order to search for the CSP’s. If water bodies or voids exist in the dataset that are larger than the thin extent width or height critical points could be missed resulting in erroneous surface values across and near the edges of those voids. If you feel that the exported surface shows characteristics of missing critical surface points across void areas, it is suggested that you add breaklines to hold the edge of the water body and/or increase the thin extent width and height settings. Suggested values of thin extent widths and heights can be measured by estimating the largest span across the void areas.
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| Additional Comments |
| If you have any questions about the information provided in this article please contact [email protected] at any time. |
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