Volume XLI-B3
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLI-B3, 233-239, 2016
https://doi.org/10.5194/isprs-archives-XLI-B3-233-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLI-B3, 233-239, 2016
https://doi.org/10.5194/isprs-archives-XLI-B3-233-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

  09 Jun 2016

09 Jun 2016

DIGITAL TERRAIN FROM A TWO-STEP SEGMENTATION AND OUTLIER-BASED ALGORITHM

Kassel Hingee1,2,3, Peter Caccetta2, Louis Caccetta3, Xiaoliang Wu2, and Drew Devereaux2 Kassel Hingee et al.
  • 1School of Mathematics and Statistics, University of Western Australia, Stirling Highway, Perth, Western Australia
  • 2CSIRO, Underwood Ave, Floreat, Perth, Australia
  • 3Department of Mathematics and Statistics, Curtin University, Kent Street, Bentley, Western Australia

Keywords: Digital Elevation Models, DEM, DTM, DSM, ground filter, surface fitting, point cloud filtering

Abstract. We present a novel ground filter for remotely sensed height data. Our filter has two phases: the first phase segments the DSM with a slope threshold and uses gradient direction to identify candidate ground segments; the second phase fits surfaces to the candidate ground points and removes outliers. Digital terrain is obtained by a surface fit to the final set of ground points. We tested the new algorithm on digital surface models (DSMs) for a 9600km2 region around Perth, Australia. This region contains a large mix of land uses (urban, grassland, native forest and plantation forest) and includes both a sandy coastal plain and a hillier region (elevations up to 0.5km). The DSMs are captured annually at 0.2m resolution using aerial stereo photography, resulting in 1.2TB of input data per annum. Overall accuracy of the filter was estimated to be 89.6% and on a small semi-rural subset our algorithm was found to have 40% fewer errors compared to Inpho’s Match-T algorithm.