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Proceedings Paper

Evaluation of laser scanner data in forest areas
Author(s): Andre Samberg; Juha M. Hyyppa; Georg S. Ruppert; Hannu Hyyppa; Michaela Ziegler; Mathias Schardt; Arttu Soininen
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Paper Abstract

The laser data acquired by the airborne laser scanner, called TopoSys-1, in the forest area has been evaluated in this study. The test site was the boreal forest of 0.5 km by 2.0 km in size in southern Finland. The laser scanning system provided 127 measurements per scan line across the flight direction at the pulse repetition rate of 83 kHz. Both the First pulse and Last pulse modes were employed. The position of the carrying platform was determined using the integrated DGPS/INS system. The original laser data set used in the analyses was geocoded but unfiltered. The files only consisted of X, Y, Z coordinates of each sample. First, the whole laser data were classified in four classes, namely: ground, vegetation, buildings, and erroneous points using the TerraScan software on top Microstation SE. After that the ground points were further processed when the still present vegetation removed. Finally, the Digital Elevation Models (DEMs) were generated. The terrain variation was from 91.3 m to 128.4 m. The DEM made from the laser data was compared with the reference DEM available at that moment. The systematic error was 1.03 meters. The standard deviation between the two DEMs was 2.77 meters. Using ground control points, the systematic error can be overcome. However, a more accurate reference DEM is needed for the future comparison. In addition, a map of the true tree heights in the area was generated at the cell size of 1 m by 1 m. The clear-cut areas can be more easily seen than using the aerial photographs.

Paper Details

Date Published: 28 May 1999
PDF: 12 pages
Proc. SPIE 3707, Laser Radar Technology and Applications IV, (28 May 1999); doi: 10.1117/12.351385
Show Author Affiliations
Andre Samberg, Helsinki Univ. of Technology (Finland)
Juha M. Hyyppa, Helsinki Univ. of Technology (Finland)
Georg S. Ruppert, Joanneum Research (Austria)
Hannu Hyyppa, Helsinki Univ. of Technology (Finland)
Michaela Ziegler, Joanneum Research (Austria)
Mathias Schardt, Joanneum Research (Austria)
Arttu Soininen, Terrasolid Ltd. (Finland)

Published in SPIE Proceedings Vol. 3707:
Laser Radar Technology and Applications IV
Gary W. Kamerman; Christian Werner, Editor(s)

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