ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2018, Vol. 15, No. 2, pp. 100-111

Investigation of 3D structure of vegetation cover in yernik tundra using photography and automated image processing techniques

I.V. Matelenok 1 , V.V. Melentyev 1 
1 State University of Aerospace Instrumentation, Saint Petersburg, Russia
Accepted: 31.12.2017
DOI: 10.21046/2070-7401-2018-15-2-100-111
Simulation of radio wave propagation in multilayer media using current electrodynamic models requires the most complete information about vegetation properties including 3D structure. A new approach to evaluation of orientation and relative position of plant elements in vegetation cover formed by shrubs and dwarf-shrubs was proposed in the paper. It is based on multi-view photography of vegetation cover fragments. The approach is implemented in a new version of the instrument for surveying vegetation cover structure. Experiments for automatized retrieving spatial positions of plant elements in controlled conditions were carried out in frame of two-step testing. A field survey on sites in the Nenets Autonomous Area and Murmansk Region and succeeding cameral work have resulted in estimates of the orientation and collocation of the dwarf birch leaves. Comparative analysis showed an agreement between the values of the structure parameters obtained with the proposed approach and one of the alternative approaches. The obtained leaf angle distribution resembles spherical and plagiophile standard distributions, and ellipsoid density function is more appropriate to describe the data. Regional differences in leaf angle distribution for the studied vegetation cover are not detected. Three-dimensional graphic models of vegetation cover fragments are constructed on the basis of the data. Data representation allows to use it for modeling radio wave propagation, evaluating biomass accumulation and performing thermophysical calculations.
Keywords: digital photography, dwarf-shrub tundra, image processing, leaf angle distribution, leaf inclination angle, vegetation cover structure, electrodynamic models
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