AIRBORNE LASER SCANNING STRIP ADJUSTMENT AND AUTOMATION OF TIE SURFACE MEASUREMENT

Abstract

Airborne laser scanning of the earth surface and other objects on top it yields
measurements of unstructured point clouds in a strip wise manner. Often multiple
length strips with a small overlap are observed, sometimes augmented by a few
cross strips for validation purposes. Due to inaccurate calibration of the entire
measurement system and due to the limited accuracy of direct geo-referencing (i.e.,
the exterior orientation determination) with GPS and IMU, including systematic
errors, adjacent strips may have discrepancies in their overlap. For removing these
discrepancies strip adjustment algorithms require quantification on these offsets at
various locations within the overlapping zones. Different methods of strip
adjustment are reviewed, followed by the presentation of a general method for
determining the discrepancies automatically. This method the core of the paper
is based on segmenting the point cloud in the overlap. In the examples, mean offsets
between neighboring strips in the order of a few centimeters are reconstructed. The
offsets also show substantial variation along the strip. The method developed for
discrepancy determination can be applied to height or full 3D strip adjustment and
for approaches using the original measurements, the coordinates of the measured
points, or only the offsets between surfaces. An example of strip adjustment using
discrepancy observations with the method presented and a discussion of the results
conclude this paper.