Bulletin des sciences géographiques de l'INCT
Volume 12, Numéro 2, Pages 27-33
2008-10-31
Analysis Of Planimetrie Accuracy Of Airborne Laser Scanning Surveys
Authors : Vosselman G .
Abstract
With the increasing pulse rates of ai.rbome laser scanners point clouds become an interesting data source for mapping beyond the production of digital terrain models. Whereas height accuracy of point clouds is of prime importance for terrain models. mapping of buildings and other objects also requires an analysis of planimetrie accuracy of point clouds. This paper presents a methodology to estimate relative strip offsets and standard deviations of X- and Y-coordinates using automatically extracted ridge lines of buildings in overlaps between strips. An analysis of three blocks with 200-250 million points each shows thal constant strip offsets explain the majority of planimetrie shif1s between ridge lines in strip overlaps. Il is demonstrated thal strip offsets below 3-4 cm and platform positioning noise of only 2 cm can be obtained with GPS configurations consisting of two onboard receivers and multiple reference stations in the terrain and a low flying height.
Keywords
Laser scanning. 3-D feature extraction. aerial survey. accuracy analysis. buildings.
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