Analysis of LiDAR waveform data for ground filtering in a forest area

Yu Chia Hung, Cheng Kai Wang, Yi-Hsing Tseng

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The airborne laser scanning (ALS) data is becoming a standard approach for generating digital elevation model (DEM) in recent years. To generate the DEM, the ground points in the point clouds need to be classified firstly. Traditionally, the points provided by the multi-return LiDAR system only provide the three-dimension coordinates of points and the classification approaches normally can mainly utilize the geometric conditions to separate the ground points from the non-ground points. If the terrain relief is varied quickly, the geometry-based classifier could not be satisfied for ground filtering purpose. In recent years, the commercial waveform LiDAR system has advanced developed. The waveforms can preserve more information of targets than the traditional multi-return LiDAR data. Since waveform is the interactions between targets and laser signals, this interaction can be considered as the convolution between the transmitted laser pulse and the backscatter cross-section function of the targets. For this reason, more radiation and geometric characteristics of targets can be extracted. As the observations of real waveform data, we found out that the width of trees is larger than the ground. For this reason, we utilized the backscattered cross-section of targets and the echo width extracted from waveform data as new properties of points for improving the classification accuracy. Firstly some training data is chosen for designing the classifier to separate the non-ground points from the point clouds. We aimed at the analysis of the performance in classifying ground points by using the extracted waveform features. Our preliminary results show the potential of the waveform features for ground classification purpose in a forest area and also reveal thatthe characteristics of waveform is useful in classification.

Original languageEnglish
Title of host publication33rd Asian Conference on Remote Sensing 2012, ACRS 2012
Pages1267-1270
Number of pages4
Publication statusPublished - 2012 Dec 1
Event33rd Asian Conference on Remote Sensing 2012, ACRS 2012 - Pattaya, Thailand
Duration: 2012 Nov 262012 Nov 30

Publication series

Name33rd Asian Conference on Remote Sensing 2012, ACRS 2012
Volume2

Other

Other33rd Asian Conference on Remote Sensing 2012, ACRS 2012
CountryThailand
CityPattaya
Period12-11-2612-11-30

Fingerprint

Classifiers
Lasers
Convolution
Laser pulses
Scanning
Radiation
Geometry

All Science Journal Classification (ASJC) codes

  • Information Systems

Cite this

Hung, Y. C., Wang, C. K., & Tseng, Y-H. (2012). Analysis of LiDAR waveform data for ground filtering in a forest area. In 33rd Asian Conference on Remote Sensing 2012, ACRS 2012 (pp. 1267-1270). (33rd Asian Conference on Remote Sensing 2012, ACRS 2012; Vol. 2).
Hung, Yu Chia ; Wang, Cheng Kai ; Tseng, Yi-Hsing. / Analysis of LiDAR waveform data for ground filtering in a forest area. 33rd Asian Conference on Remote Sensing 2012, ACRS 2012. 2012. pp. 1267-1270 (33rd Asian Conference on Remote Sensing 2012, ACRS 2012).
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abstract = "The airborne laser scanning (ALS) data is becoming a standard approach for generating digital elevation model (DEM) in recent years. To generate the DEM, the ground points in the point clouds need to be classified firstly. Traditionally, the points provided by the multi-return LiDAR system only provide the three-dimension coordinates of points and the classification approaches normally can mainly utilize the geometric conditions to separate the ground points from the non-ground points. If the terrain relief is varied quickly, the geometry-based classifier could not be satisfied for ground filtering purpose. In recent years, the commercial waveform LiDAR system has advanced developed. The waveforms can preserve more information of targets than the traditional multi-return LiDAR data. Since waveform is the interactions between targets and laser signals, this interaction can be considered as the convolution between the transmitted laser pulse and the backscatter cross-section function of the targets. For this reason, more radiation and geometric characteristics of targets can be extracted. As the observations of real waveform data, we found out that the width of trees is larger than the ground. For this reason, we utilized the backscattered cross-section of targets and the echo width extracted from waveform data as new properties of points for improving the classification accuracy. Firstly some training data is chosen for designing the classifier to separate the non-ground points from the point clouds. We aimed at the analysis of the performance in classifying ground points by using the extracted waveform features. Our preliminary results show the potential of the waveform features for ground classification purpose in a forest area and also reveal thatthe characteristics of waveform is useful in classification.",
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Hung, YC, Wang, CK & Tseng, Y-H 2012, Analysis of LiDAR waveform data for ground filtering in a forest area. in 33rd Asian Conference on Remote Sensing 2012, ACRS 2012. 33rd Asian Conference on Remote Sensing 2012, ACRS 2012, vol. 2, pp. 1267-1270, 33rd Asian Conference on Remote Sensing 2012, ACRS 2012, Pattaya, Thailand, 12-11-26.

Analysis of LiDAR waveform data for ground filtering in a forest area. / Hung, Yu Chia; Wang, Cheng Kai; Tseng, Yi-Hsing.

33rd Asian Conference on Remote Sensing 2012, ACRS 2012. 2012. p. 1267-1270 (33rd Asian Conference on Remote Sensing 2012, ACRS 2012; Vol. 2).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Hung YC, Wang CK, Tseng Y-H. Analysis of LiDAR waveform data for ground filtering in a forest area. In 33rd Asian Conference on Remote Sensing 2012, ACRS 2012. 2012. p. 1267-1270. (33rd Asian Conference on Remote Sensing 2012, ACRS 2012).