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Significant advances have been made in the technology available for use on mapping projects. The trend toward delivering larger projects in a compressed time frame has driven further changes.
Project
specifications typically spell out accuracy requirements for both the
horizontal and vertical components in LiDAR collection.
But while a thorough assessment and reporting of the vertical accuracy of the
elevation surface is almost always completed for LiDAR projects, a formal
evaluation of the horizontal accuracy is less often required.
I gave a brief review of the results from the first meeting held last year on this effort. This month, I will report on the second National LiDAR Strategy Meeting held May 21-22 at the headquarters of the U.S. Geological Survey (USGS) in Reston, Va.
Breaklines are an important component of most terrain models. They serve as 3D lines that control the surface behavior in terms of smoothness and continuity.
Many of the presenters at the International LiDAR Mapping Forum (ILMF) in February discussed the growing interest and need for a new nationwide elevation data collection.
Not too long ago, a professional land surveyor whom I respect posed a very interesting question centering on the relationship between LiDAR and traditional photogrammetry: will LiDAR ever eliminate the need for aerial photography? The question was prompted from a debate in his surveying/engineering firm regarding the future of photogrammetry.