Abstract
In this article, we present an investigation regarding the differences between a full-waveform and a discrete-return terrestrial laser scanner employed in a survey of a mountain area with dense vegetation. The Riegl LMS-Z620 provides discrete returns whereas the Riegl VZ-400 provides multiple returns with associated width and amplitude of the peaks extracted by online waveform processing. The uncertainty about the stability of the terrain underlying the mountain slope, which was affected by a landslide in 1966, gives a particular importance to an accurate representation of the terrain surface, thus to a robust filtering of the vegetation component. The VZ-400 scans were pre-filtered by exploiting the “calibrated relative reflectance” readings and the multi-target capability provided by this laser scanning system. In the next step, two spatial filters were applied to both georeferenced 3D models in order to eliminate vegetation using an iterative filter and a custom morphological filter. Results show that the use of the iterative morphological filter performs quite well in eliminating the vegetation from both datasets. Vegetation in sloped terrain does still limit the complete removal of the above-ground elements, thus a completely automatic procedure is still not applicable. Stem and canopy growing direction with respect to ground is a factor which should be taken into account in future developments of the procedure. Differences between the two results show that a higher point density is obtained from the VZ-400 due to its multi-return capabilities and the added characteristics extracted from the online waveform processing give added value for filtering more accurately. Results demonstrate that a TLS with multi-target capability can potentially provide a more detailed DTM in presence of dense vegetation.
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Alba M, Longoni L, Papini M, Roncoroni F, Scaioni M (2005) Feasibility and problems of TLS in modeling rock faces for hazard mapping. In: ISPRS WG III/3, III/4, V/3 Workshop "Laser scanning 2005", Enschede, the Netherlands, September 12–14, 2005, pp. 156–161
Axelsson P (1999) Processing of laser scanner data algorithms and applications. ISPRS J Photogramm Remote Sens 54:138–147
Barbarella M, Fiani M (2012) Landslide monitoring using terrestrial laser scanner: georeferencing and canopy filtering issues in a case study. Int Arch Photogramm Remote Sens Spatial Inf Sciences Commission V, WG V/3 , E195015
Bertacchini E, Capra A, Castagnetti C, Rivola R (2012) Investigating an active rockslide by long-range laser scanner: alignment strategy and displacement identification. In: FIG Working Week 2012 Knowing to manage the territory, protect the environment, evaluate the cultural heritage Rome, Italy, 6–10 May 2012
Bitelli G, Gatta G, Landuzzi A, Vittuari L, Zanutta A (2009) La fotogrammetria digitale di archivio per lo studio multitemporale di un’area in frana nelle Prealpi vicentine. In: Proceedings of the 13th Italian National Conference ASITA Bari Italy
Castagnetti C, Casula G, Dubbini M, Capra A (2009) Adjustment and transformation strategies of ItalPoS Permanent GNSS Network. Ann Geophys 52(2):181–195
Castagnetti C, Bertacchini E, Corsini A, Capra A (2013) Multi-sensors integrated system for landslide monitoring: critical issues in system setup and data management. Eur J Remote Sens 46:104–124. doi:10.5721/EuJRS20134607
Chen Y, Medioni G (1992) Object modelling by registration of multiple range images. Image Vis Comput 10(3):145–155
Corsini A, Castagnetti C, Bertacchini E, Rivola R, Ronchetti F, Capra A (2013) Integrating airborne and multi-temporal long-range terrestrial laser scanning with total station measurements for mapping and monitoring a compound slow moving rock slide. Earth Surf Process Landf. doi:10.1002/esp.3445
Costantino D, Angelini MG (2011). Features and ground automatic extraction from airborne LiDAR data. The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences 36, In: ISPRS Workshop Laser Scanning 2011. Calgary, 29–31 August 2011, vol. XXXVIII
Doneus M, Pfennigbauer M, Studnicka N, Ullrich A (2009) Terrestrial waveform laser scanning for documentation of cultural heritage. In: Proceedings of the XXIIth CIPA Symposium Kyoto Japan
Doneus M, Briese C, Studnicka N (2010) Analysis of full-waveform als data by simultaneously acquired TLS data: towards an advanced DTM generation in wooded areas. In: ISPRS TC VII Symposium – 100 Years ISPRS, Wagner W, Székely B (eds.), Vienna, Austria, July 5–7, 2010, IAPRS, Vol. XXXVIII, Part 7B
Godone D, Garnero G (2013) The role of morphometric parameters in Digital Terrain Models interpolation accuracy: a case study. Eur J Remote Sens 46:198–214. doi:10.5721/EuJRS20134611
Goshtasby AA (2005) 2-D And 3-D Image Registration: for medical, remote sensing, and industrial applications. Wiley–Interscience
Haralick RM, Shapiro LG (1992) Computer and robot vision. Addison-Wesley Longman Publishing Co. Inc, Boston MA USA
Hopkinson C (2007) The influence of flying altitude, beam divergence, and pulse repetition frequency on laser pulse return intensity and canopy frequency distribution. Can J Remote Sens 33(4):312–324. doi:10.5589/m07-029
Huber D, Hebert M (2003) Fully automatic registration of multiple 3d data sets. Image Vis Comput 21(7):637–650
Kraus K, Pfeifer N (2001) Advanced DTM generation from LiDAR data. Int Arch Photogramm Remote Sens Spat Inf Sci 34(3/W4):23–30
Lichti DD, Franke J (2005) Self-calibration of the iQsun880 laser scanner. In: Optical 3-D Measurement Techniques VII, Vienna, Austria, Vol. I, pp. 112–121
Lichti DD, Gordon S (2004) Error propagation in directly georeferenced terrestrial laser scanner point clouds for cultural heritage recording. Proceedings of FIG Working Week Athens, Greece, May 22–27, 2004
Lichti DD, Jamtsho S (2006) Angular resolution of terrestrial laser scanners. Photogramm Rec 2(114):141–160
Lichti DD, Licht MG (2006) Experiences with terrestrial laser scanner modelling and accuracy assessment. IAPRS Volume XXXVI, Part 5, Dresden 25–27 September 2006 pp 155–160
Lichti DD, Gordon S, Tipdecho T (2005) Error models and propagation in directly georeferenced terrestrial laser scanner networks. J Surv Eng 131(4):135–142
Maas HG (2010) Foresty Applications. In: Maas HG VG (ed) Airborne and terrestrial laser scanning. Whittles Publishing, UK
Pfennigbauer M, Rieger P, Studnicka N, Ullrich A (2009) Detection of concealed objects with a mobile laser scanning system. In: Laser Radar Technology and Applications XIV, Turner MD, Kamerman GW eds, Proc. of SPIE Vol. 7323, 732308
Pirotti F, Grigolato S, Lingua E, Tarolli P, Sitzia T (2012) Laser scanner applications in forest and environmental sciences. Eur J Remote Sens 44(1):109–123. doi:10.5721/ItJRS20124419
Pirotti F, Guarnieri A, Vettore A (2013) Ground filtering and vegetation mapping using multi-return terrestrial laser scanning. ISPRS J Photogramm Remote Sens 76:56–63. doi:10.1016/j.isprsjprs.2012.08.003
Riegl (2009) Latest News March 2009. Riegl Website. http://www.riegl.com/uploads/tx_pxpriegldownloads/RIEGL_VZ-400_News_03-2009.pdf. Accessed 26 June 2012
Riegl (2012) Riegl VZ-400 Product Website. http://www.riegl.com/nc/products/terrestrial-scanning/produktdetail/product/scanner/5/. Accessed: 26 June 2012
Roncat A, Wagner W, Melzer T, Ullrich A (2008) Echo detection and localization in full-waveform airborne laser scanner data using the averaged square difference function estimator. Photogramm J Finl 21(1):62–75
Roncat A, Bergauer G, Pfeifer N (2011) B-spline deconvolution for differential target cross-section determination in full-waveform laser scanning data. ISPRS J Photogramm Remote Sens 66:418–428
Scaioni M (2005) Direct georeferencing of TLS in complex sites. Int Arch Photogramm Remote Sens Spatial Inf Sciences 36: on CDROM
Theiler PW, Schindler K (2012) Automatic registration of terrestrial laser scanner point-clouds using natural planar surfaces. ISPRS Ann Photogramm Remote Sens Spatial Inf Sciences , Volume I-3, 2012 XXII ISPRS Congress, 25 August – 01 September 2012, Melbourne, Australia pp 173–178
Toth C, Brzezinska D (2007) Airborne laser altimetry: DEM production and feature extraction. In: 5th International Symposium on Mobile Mapping Technology, MMT’07, invited presentation, May 27–30, Padova, Italy
Ullrich A, Pfennigbauer M (2011) Echo digitization and waveform analysis in airborne and terrestrial laser scanning. In: Photogrammetric Week 2011, Dieter Fritsch (ed). Stuttgart Germany, pp 217–228
Ullrich A, Reichert R (2005) High resolution laser scanner with waveform digitization for subsequent full waveform analysis. In: SPIE Laser Radar Technology and Applications X, Orlando, Florida, USA, pp 82–88
Vosselman G (2000) Slope based filtering of laser altimetry data. Int Arch Photogramm Remote Sens Spatial Inf Sciences 33 (Part B3):935–942
Wagner W, Ullrich A, Ducic V, Melzer T, Studnicka N (2006) Gaussian decomposition and calibration of a novel small-footprint full-waveform digitising airborne laser scanner. ISPRS J Photogramm Remote Sens 60(2):100–112
Acknowledgments
Authors wish to thank prof. Gabriele Bitelli and his research team of the Department of Civil, Environmental and Materials Engineering (DICAM) of the University of Bologna (Italy) for the provision of the Riegl VZ-400 laser scanner and the technical support given during the survey.
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Pirotti, F., Guarnieri, A. & Vettore, A. Vegetation filtering of waveform terrestrial laser scanner data for DTM production. Appl Geomat 5, 311–322 (2013). https://doi.org/10.1007/s12518-013-0119-3
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DOI: https://doi.org/10.1007/s12518-013-0119-3