Кл.слова (ненормированные):
Boreal forest -- GLAS -- LiDAR -- MODIS -- Multispectral -- Siberia -- Timber volume -- Aneroid altimeters -- Biological materials -- Biomass -- Landforms -- Logging (forestry) -- Optical radar -- Radio altimeters -- Renewable energy resources -- Spectrometers -- Timber -- Boreal forest -- GLAS -- LiDAR -- MODIS -- Multispectral -- Siberia -- Timber volume -- Atmospherics -- biomass -- boreal forest -- canopy -- forest resource -- land cover -- MODIS -- timber -- Biomass -- Curl -- Forest Canopy -- Forests -- Land Use -- Logging -- Optical Instruments -- Radar -- Radio -- Remote Sensing -- Renewable Resources -- Spectrometers -- Eurasia -- Siberia
Аннотация: Geosciences Laser Altimeter System (GLAS) space LiDAR data are used to attribute a MODerate resolution Imaging Spectrometer (MODIS) 500В m land cover classification of a 10В° latitude by 12В° longitude study area in south-central Siberia. Timber volume estimates are generated for 16 forest classes, i.e., four forest cover types ? four canopy density classes, across this 811,414В km 2 area and compared with a ground-based regional volume estimate. Two regional GLAS/MODIS timber volume products, one considering only those pulses falling on slopes ? 10В° and one utilizing all GLAS pulses regardless of slope, are generated. Using a two-phase(GLAS-ground plot) sampling design, GLAS/MODIS volumes average 163.4 В± 11.8В m 3/ha across all 16 forest classes based on GLAS pulses on slopes ? 10В° and 171.9 В± 12.4В m 3/ha considering GLAS shots on all slopes. The increase in regional GLAS volume per-hectare estimates as a function of increasing slope most likely illustrate the effects of vertical waveform expansion due to the convolution of topography with the forest canopy response. A comparable, independent, ground-based estimate is 146В m 3/ha [Shepashenko, D., Shvidenko, A., and Nilsson, S. (1998). Phytomass (live biomass) and carbon of Siberian forests. Biomass and Bioenergy, 14, 21-31], a difference of 11.9% and 17.7% for GLAS shots on slopes ? 10В° and all GLAS shots regardless of slope, respectively. A ground-based estimate of total volume for the entire study area, 7.46 ? 10 9В m 3, is derived using Shepashenko et al.'s per-hectare volume estimate in conjunction with forest area derived from a 1990 forest map [Grasia, M.G. (ed.). (1990). Forest Map of USSR. Soyuzgiproleskhoz, Moscow, RU. Scale: 1:2,500,000]. The comparable GLAS/MODIS estimate is 7.38 ? 10 9В m 3, a difference of less than 1.1%. Results indicate that GLAS data can be used to attribute digital land cover maps to estimate forest resources over subcontinental areas encompassing hundreds of thousands of square kilometers.
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Держатели документа:
Biospheric Sciences Branch, NASA/Goddard Space Flight Center, Code 614.4, Greenbelt, MD 20771, United States
Department of Geography, University of Maryland, College Park, MD 20742, United States
Sukachev Forest Institute, Krasnoyarsk-36, Academgorodok, Russian Federation
Science Systems and Applications, Inc., Lanham, MD 20706, United States
Доп.точки доступа:
Nelson, R.; Ranson, K.J.; Sun, G.; Kimes, D.S.; Kharuk, V.; Montesano, P.