Zobrazeno 1 - 10
of 119
pro vyhledávání: '"Michael A. Lefsky"'
Autor:
Taejin Park, Robert E. Kennedy, Sungho Choi, Jianwei Wu, Michael A. Lefsky, Jian Bi, Joshua A. Mantooth, Ranga B. Myneni, Yuri Knyazikhin
Publikováno v:
Remote Sensing, Vol 6, Iss 7, Pp 6566-6586 (2014)
Forest canopy height is an important biophysical variable for quantifying carbon storage in terrestrial ecosystems. Active light detection and ranging (lidar) sensors with discrete-return or waveform lidar have produced reliable measures of forest ca
Externí odkaz:
https://doaj.org/article/f12aaf9aafa74b788d6fc4fced65eb4e
Autor:
Xiliang Ni, Taejin Park, Sungho Choi, Yuli Shi, Chunxiang Cao, Xuejun Wang, Michael A. Lefsky, Marc Simard, Ranga B. Myneni
Publikováno v:
Remote Sensing, Vol 6, Iss 5, Pp 3533-3553 (2014)
The ultimate goal of our multi-article series is to demonstrate the Allometric Scaling and Resource Limitation (ASRL) approach for mapping tree heights and biomass. This third article tests the feasibility of the optimized ASRL model over China at bo
Externí odkaz:
https://doaj.org/article/467266a8249a4bec98ff572fde6ec0c1
Autor:
Ramakrishna R. Nemani, Ranga B. Myneni, Chunxiang Cao, Wenge Ni-Meister, Shilong Piao, Shihyan Lee, Sassan S. Saatchi, Marc Simard, Michael A. Lefsky, Hieu V. Duong, Gong Zhang, Yuli Shi, Sangram Ganguly, Xiliang Ni, Sungho Choi
Publikováno v:
Remote Sensing, Vol 5, Iss 1, Pp 202-223 (2013)
The ultimate goal of this multi-article series is to develop a methodology to generate continuous fields of tree height and biomass. The first paper demonstrated the need for Allometric Scaling and Resource Limitation (ASRL) model optimization and it
Externí odkaz:
https://doaj.org/article/2c09ddebbefc4a1fbf78e41333aa242e
Autor:
Ramakrishna R. Nemani, Chunxiang Cao, Shilong Piao, Shihyan Lee, Wenge Ni-Meister, Sassan S. Saatchi, Marc Simard, Michael A. Lefsky, Hieu V. Duong, Gong Zhang, Sangram Ganguly, Xiliang Ni, Sungho Choi, Yuli Shi, Ranga B. Myneni
Publikováno v:
Remote Sensing, Vol 5, Iss 1, Pp 284-306 (2013)
A methodology to generate spatially continuous fields of tree heights with an optimized Allometric Scaling and Resource Limitations (ASRL) model is reported in this first of a multi-part series of articles. Model optimization is performed with the Ge
Externí odkaz:
https://doaj.org/article/39c4935b0cc74ade93674a8f6df75b7a
Publikováno v:
Journal of Sustainable Forestry. 40:263-280
The topographical advantage is the contribution of topographic and traffic conditions to the operational efficiency such as afforestation, cutting, logging, and transportation of forestland. The cl...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::44884c1c4d6ca2abd20f57b40efb05be
https://doi.org/10.1080/10549811.2020.1751207
https://doi.org/10.1080/10549811.2020.1751207
Autor:
Eileen H. Helmer, Thomas S. Ruzycki, Barry T. Wilson, Kirk R. Sherrill, Michael A. Lefsky, Humfredo Marcano-Vega, Thomas J. Brandeis, Heather E. Erickson, Bonnie Ruefenacht
Publikováno v:
Remote Sensing, Vol 10, Iss 11, p 1724 (2018)
We mapped native, endemic, and introduced (i.e., exotic) tree species counts, relative basal areas of functional groups, species basal areas, and forest biomass from forest inventory data, satellite imagery, and environmental data for Puerto Rico and
Externí odkaz:
https://doaj.org/article/edaf436ca0054d888436365eadeae21d
Publikováno v:
Remote Sensing of Environment. 224:154-166
Lidar is an established tool for mapping forest structure, but its sparse spatial and temporal coverage often preclude its use in studying forest disturbance. In contrast, aerial imagery has been and continues to be regularly collected in many region
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::36e1aeb3b4cd4983f068cbfad39be5be
https://doi.org/10.1016/j.rse.2019.01.029
https://doi.org/10.1016/j.rse.2019.01.029
Publikováno v:
Remote Sensing, Vol 9, Iss 2, p 123 (2017)
Remotely-sensed estimates of forest biomass are usually based on various measurements of canopy height, area, volume or texture, as derived from LiDAR, radar or fine spatial resolution imagery. These measurements are then calibrated to estimates of s
Externí odkaz:
https://doaj.org/article/ad7ce34c2f5f402c8035e7e7d8e42b7f
Autor:
Joshua Faulconer, David J. Cooper, Michael A. Lefsky, Jeremy R. Shaw, Joseph W. Wagenbrenner, Stephanie K. Kampf
Publikováno v:
Water Resources Research. 54:9935-9950
Rainfall thresholds for streamflow generation are commonly mentioned in the literature, but studies rarely include methods for quantifying and comparing thresholds. This paper quantifies thresholds in ephemeral streams and evaluates how they are affe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4075a866d46c339967de63260dd81a16
https://doi.org/10.1029/2018wr023714
https://doi.org/10.1029/2018wr023714
Autor:
Yan Yang, Sassan S. Saatchi, Liang Xu, Yifan Yu, Michael A. Lefsky, Lee White, Yuri Knyazikhin, Ranga B. Myneni
Publikováno v:
Remote Sensing, Vol 8, Iss 6, p 494 (2016)
Spatial variation of tropical forest tree height is a key indicator of ecological processes associated with forest growth and carbon dynamics. Here we examine the macroscale variations of tree height of humid tropical forests across three continents
Externí odkaz:
https://doaj.org/article/6816a738ca884b3983e89ce3b9574363