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- W166499580 abstract "The precision of airborne laserscanner data is strongly influenced by the limited accuracy potential of the integrated GPS/INS pose determination system. Errors of kinematic GPS height determination will often be in the order of one to two decimeters and propagate directly into the height coordinates of digital surface models, digital terrain models and 3-D object models derived from these data. The planimetric accuracy of ground points is influenced by the kinematic GPS accuracy as well as by drift effects of the INS system and is in the order of a few decimeters. Errors become evident at check points or as discrepancies between neighboring strips of laserscanner data. Vice versa, these discrepancies can be used to apply corrections to laserscanner data in a strip adjustment procedure. Tie points for laserscanner strip adjustment can be determined with high precision by least-squares matching applied to the original non-interpolated ground point clouds organized in stripwise TINs. This procedure provides useful results in regions with sufficient surface slopes in both coordinate directions, but fails over flat terrain if both height and planimetry coordinate discrepancies are to be determined. In such situations, image contrast in the laserscanner pulse reflectance data, simultaneously recorded by some laserscanner systems and perfectly co-registered with the height data in the TIN structure, can replace non-existent height contrast and provide a solution. The paper describes the extension of least-squares-matching to the alternative use of height and reflectance values of irregularly distributed laserscanner points for the determination of laserscanner strip discrepancies in flat regions with existing local image intensity contrast. The practical applicability and precision potential of the technique will be discussed." @default.
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- W166499580 date "2001-01-01" @default.
- W166499580 modified "2023-09-27" @default.
- W166499580 title "On the use of pulse reflectance data for laserscanner strip adjustment" @default.
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