XXII ISPRS Congress 2012: Technical Commission VII

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Multivolume work

Persistent identifier:: 1663813779

Title:: XXII ISPRS Congress 2012

Sub title:: Melbourne, Australia, 25 August-1 September 2012

Year of publication:: 2013

Place of publication:: Red Hook, NY

Publisher of the original:: Curran Associates, Inc.

Identifier (digital):: 1663813779

Language:: English

Additional Notes:: Kongress-Thema: Imaging a sustainable future

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Document type:: Multivolume work

Volume

Persistent identifier:: 1663821976

Title:: Technical Commission VII

Scope:: 546 Seiten

Year of publication:: 2013

Place of publication:: Red Hook, NY

Publisher of the original:: Curran Associates, Inc.

Identifier (digital):: 1663821976

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(39,B7)

Language:: English

Additional Notes:: Erscheinungsdatum des Originals ist ermittelt.; Literaturangaben

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2019

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: [VII/7, III/2, V/3: WAVEFORM LIDAR FOR REMOTE SENSING]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: EXPLORING WEAK AND OVERLAPPED RETURNS OF A LIDAR WAVEFORM WITH A WAVELET-BASED ECHO DETECTOR C. K. Wang

Document type:: Multivolume work

Structure type:: Chapter

International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XXXIX-B7, 2012 XXII ISPRS Congress, 25 August — 01 September 2012, Melbourne, Australia 4. CONCLUSION This paper presents a wavelet-based detector to detect the responded echoes in LIDAR waveforms. Some simulated waveforms with noises are made to test the limitation of the detector. The detector treats an echo as an effective return only if its SNR exceeds a threshold. The experiments suggest that a weak echo can be detected as long as its SNR is greater than 16 dB. Normally an echo has SNR lower than 22 dB will be missed in the online process of an ALS. The experimental results also show that the detector can resolve two distinct scatters as long as the echoes are separated with a distance larger than the range resolution of the ALS. In addition to the analysis on simulated data, the detector has also been applied to a set of waveform data captured with Leica ALS60 for a forested mountainous area. In addition to the total number of echoes provided by the instrument, the detector increasingly found 18% more of the original number of echoes. This result shows the ability of the proposed detector in finding weak and overlapped returns from waveforms. These extra echoes can potentially be used to improve the estimation of canopy height and ground surface for a forested area. REFERENCES Chauve, A., C. Vega, S. Durrieu, F. Bretar, T. Allouis, M. Pierrot Deseilligny and W. Puech, 2009. Advanced full- waveform lidar data echo detection: Assessing quality of derived terrain and tree height models in an alpine coniferous forest. International Journal of Remote Sensing 30(19), pp. 5211-5228. Jiao, Long, Suya Gao, Fang Zhang and Hua Li, 2008. Quantification of components in overlapping peaks from capillary electrophoresis by using continues wavelet transform method. Talanta 75(4), pp. 1061-1067. Mallet, Clement and Frederic Bretar, 2009. Full-waveform topographic lidar: State-of-the-art. ISPRS Journal of Photogrammetry and Remote Sensing 64(1), pp. 1-16. Mallet, Clement, Florent Lafarge, Michel Roux, Uwe Soergel, Frederic Bretar and Christian Heipke, 2010. A Marked Point Process for Modeling Lidar Waveforms. IEEE Transactions on Image Processing 19(12), pp. 3204-3221. Pirotti, F, 2011. Analysis of full-waveform LiDAR data for forestry applications: a review of investigations and methods. iForest - Biogeosciences and Forestry 4(1), pp. 100-106. Shao, Xueguang, Wensheng Cai and Peiyan Sun, 1998. Determination of the component number in overlapping multicomponent chromatogram using wavelet transform. Chemometrics and Intelligent Laboratory Systems 43(1-2), pp. 147-155. Wagner, W., A. Ullrich, V. Ducic, T. Melzer and N. Studnicka, 2006. Gaussian decomposition and calibration of a novel small- footprint full-waveform digitising airborne laser scanner. ISPRS Journal of Photogrammetry and Remote Sensing 60(2), pp. 100- 112. 534

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