Special Section on Remote Sensing for Coupled Natural Systems and Built Environments

Bare-earth extraction from airborne LiDAR data based on segmentation modeling and iterative surface corrections

[+] Author Affiliations
Li-Der Chang, K. Clint Slatton, Carolyn Krekeler

University of Florida, Department of Electrical and Computer Engineering, 216 Larsen Hall, Gainesville, FL 32611

J. Appl. Remote Sens. 4(1), 041884 (August 31, 2010). doi:10.1117/1.3491194
History: Received May 13, 2010; Revised August 14, 2010; Accepted August 24, 2010; August 31, 2010; Online August 31, 2010
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Abstract

In the last decade, various algorithms have been developed for extracting the digital terrain model from LiDAR point clouds. Although most filters perform well in flat and uncomplicated landscapes, landscapes containing steep slopes and discontinuities are still problematic. In this research, we develop a novel bare-earth extraction algorithm consisting of segmentation modeling and surface modeling based on our previous work, forest canopy removal. The proposed segmentation modeling is built on a triangulated irregular network and composed of triangle assimilation, edge clustering, and point classification to achieve better discrimination of objects and preserve terrain discontinuities. The surface modeling is proposed to iteratively correct both Type I and Type II errors through estimating roughness of digital surface/terrain models, detecting bridges and sharp ridges, etc. Finally, we have compared our obtained filtering results with twelve other filters working on the same fifteen study sites provided by the ISPRS. Our average error and kappa index of agreement in the automated process are 4.6% and 84.5%, respectively, which outperform all other twelve proposed filters. Our kappa index, 84.5%, can be interpreted as almost perfect agreement. In addition, applying this work with optimized parameters further improves performance.

© 2010 Society of Photo-Optical Instrumentation Engineers

Topics

LIDAR ; Modeling

Citation

Li-Der Chang ; K. Clint Slatton and Carolyn Krekeler
"Bare-earth extraction from airborne LiDAR data based on segmentation modeling and iterative surface corrections", J. Appl. Remote Sens. 4(1), 041884 (August 31, 2010). ; http://dx.doi.org/10.1117/1.3491194


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