Download PDF by Matti Maltamo, Erik Næsset, Jari Vauhkonen: Forestry Applications of Airborne Laser Scanning: Concepts

By Matti Maltamo, Erik Næsset, Jari Vauhkonen

ISBN-10: 9401786623

ISBN-13: 9789401786621

ISBN-10: 9401786631

ISBN-13: 9789401786638

Airborne laser scanning (ALS) has emerged as some of the most promising distant sensing applied sciences to supply info for study and operational functions in quite a lot of disciplines with regards to administration of woodland ecosystems. This ebook presents a complete, cutting-edge evaluate of the examine and alertness of ALS in a extensive variety of forest-related disciplines, specially wooded area stock and wooded area ecology. notwithstanding, this e-book is greater than only a choice of person contributions – it comprises a well-composed mix of chapters facing basic methodological concerns and contributions reviewing and illustrating using ALS inside of quite a few domain names of program. The reports supply a accomplished and distinct assessment of contemporary examine and purposes that researchers, scholars and practitioners in wooded area distant sensing and woodland surroundings evaluate may still reflect on as an invaluable reference text.

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Extra info for Forestry Applications of Airborne Laser Scanning: Concepts and Case Studies

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2012). 2 Laser Pulse Interaction with Forest Canopy: Geometric and Radiometric Issues 35 Fig. 10 Diffuse reflectance Q for two adjacent strips of the Schönbrunn example (cf. Fig. 7). e. the canopy (cf. Chap. 6), the stems (cf. Chap. 8) and branches of the single trees, the understorey and the bare ground (see Sect. 1). Several studies have already shown that TLS is a valuable tool for the retrieval of forest parameters on single trees and at the plot level (cf. Liang et al. 2012; Yu et al. 2013).

Dr2 ÁSYS ÁATM / remains as unknown quantity whose elements cannot be easily separated and determined independently. t /dt: 1 The solution for i and further radiometric quantities, known as radiometric calibration, is described in Sect. 4. 24 A. Roncat et al. 3 Forward Modeling of ALS Return Waveforms over Forested Areas In the previous section, we have presented the calculation of the backscatter cross-section as result of a waveform deconvolution and integration. To foster a meaningful interpretation of such waveforms over forest canopies, we now synthesize them using radiative transfer models in virtual forest scenes.

Scan angle (ı ) ˙20 ˙37:5 ˙37:5 ˙37:5 ˙37:5 ˙25 ˙25 ˙30 ˙37:5 ˙30 ˙30 Beam width 0:55 mrad 0:22 mrad 0:22 mrad 0:22 mrad 0:22 mrad N/A 0:35=1:13 mrad 0:35 mrad 0:35 mrad Ä 0:5 mrad Ä 0:25 mrad Mult. pulses Yes Yes Yes Yes Yes No Yes Yes Yes Yes Yes Bit depth N/A 8 bit 8 bit 8 bit 8 bit 12 bit 12 bit Max. range (m) 1;600 6;300 1;850 4;400 6;300 2;750 4;400 4;600 3;150 3;000 5;800 Wavelength (nm) 1;064 1;064 1;064 1;064 1;064 1;064 1;064 12 bit 12 bit 2 8 bit 1;064=1;541 1;064 1;550 2 1;550 8 bit a Maximum pulse repetition rate The instrument’s maximal PRR is higher but only 120 kHz can be recorded by the FWF digitizer (Leica Geosystems 2013) c In topographic mode d The instrument’s maximal PRR is higher but only 125 kHz can be recorded by the FWF digitizer (Optech Inc.

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Forestry Applications of Airborne Laser Scanning: Concepts and Case Studies by Matti Maltamo, Erik Næsset, Jari Vauhkonen


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