C. Ressl, N. Pfeifer, G. Mandlburger:

"Applying 3D Affine Transformation And Least Squares Matching For Airborne Laser Scanning Strips Adjustment Without Gnss/imu Trajectory Data";

Talk: ISPRS Workshop Laser Scanning 2011, Calgary, Canada; 2011-08-29 - 2011-08-31; in: "Proceedings", ISPRS, Xxxviii / 5 / W12 (2011), ISSN: 1682-1777; 6 pages.

In this article we extend our previous work on the topic of ALS strip adjustment without GNSS/IMU trajectory data. Between overlapping

strip pairs the relative orientation as a 3D affine transformation is estimated by a 3D LSM approach, which uses interpolated 2.5D

grid surface models of the strips and the entire strip overlap as one big LSM window. The LSM derived relative orientations of all strip

pairs in the block together with their covariance matrices are then used simultaneously as observations in an adjustment following the

Gauss-Helmert model. This way the exterior orientation of each strip is computed, which refers to a relative block system. If proper

ground control data is given, then an absolute orientation of the block of strips can be computed by a final LSM run. In a small example

consisting of 4 strips with ca. 70% overlap the improvement in the relative geometric accuracy is demonstrated by the decreasing

sigmaMAD of the height differences from 8:4cm (before) to 1:6cm (after the strip adjustment).

http://publik.tuwien.ac.at/files/PubDat_199912.pdf

Created from the Publication Database of the Vienna University of Technology.