Results 11 to 20 of about 1,323 (182)

Retrieval of High-Resolution Vegetation Optical Depth from Sentinel-1 Data over a Grassland Region in the Heihe River Basin [PDF]

Remote Sensing, 2022
Vegetation optical depth (VOD), as a microwave-based estimate of vegetation water and biomass content, is increasingly used to study the impact of global climate and environmental changes on vegetation.
Zhilan Zhou, Lei Fan, Gabrielle De Lannoy, Xiangzhuo Liu, Jian Peng, Xiaojing Bai, Frédéric Frappart, Nicolas Baghdadi, Zanpin Xing, Xiaojun Li, Mingguo Ma, Xin Li, Tao Che, Liying Geng, Jean-Pierre Wigneron   +14 more
doaj   +3 more sources

Global changes in dryland vegetation dynamics (1988–2008) assessed by satellite remote sensing: comparing a new passive microwave vegetation density record with reflective greenness data [PDF]

Biogeosciences, 2013
Drylands, covering nearly 30% of the global land surface, are characterized by high climate variability and sensitivity to land management. Here, two satellite-observed vegetation products were used to study the long-term (1988–2008) vegetation changes ...
N. Andela, Y. Y. Liu, A. I. J. M. van Dijk, R. A. M. de Jeu, T. R. McVicar   +4 more
doaj   +6 more sources

Changing climate and overgrazing are decimating Mongolian steppes. [PDF]

PLoS ONE, 2013
Satellite observations identify the Mongolian steppes as a hotspot of global biomass reduction, the extent of which is comparable with tropical rainforest deforestation.
Yi Y Liu, Jason P Evans, Matthew F McCabe, Richard A M de Jeu, Albert I J M van Dijk, Albertus J Dolman, Izuru Saizen   +6 more
doaj   +2 more sources

Global Unsupervised Assessment of Multifrequency Vegetation Optical Depth Sensitivity to Vegetation Cover [PDF]

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2023
Vegetation optical depth (VOD) has contributed to monitor vegetation dynamics and carbon stocks at different microwave frequencies. Nevertheless, there is a need to determine which are the appropriate frequencies to monitor different vegetation types ...
Claudia Olivares-Cabello, David Chaparro, Merce Vall-llossera, Adriano Camps, Carlos Lopez-Martinez   +4 more
doaj   +5 more sources

Satellite‐Observed Vegetation Responses to Intraseasonal Precipitation Variability [PDF]

Geophysical Research Letters, 2022
There is limited understanding of how vegetation responds to intraseasonal modes of rainfall variability despite their importance in many tropical regions.
Bethan L. Harris, Christopher M. Taylor, Graham P. Weedon, Joshua Talib, Wouter Dorigo, Robin van derSchalie   +5 more
doaj   +2 more sources

Estimating leaf moisture content at global scale from passive microwave satellite observations of vegetation optical depth [PDF]

Hydrology and Earth System Sciences, 2023
The moisture content of vegetation canopies controls various ecosystem processes such as plant productivity, transpiration, mortality, and flammability. Leaf moisture content (here defined as the ratio of leaf water mass to leaf dry biomass, or live-fuel
M. Forkel, L. Schmidt, R.-M. Zotta, W. Dorigo, M. Yebra, M. Yebra   +5 more
doaj   +1 more source

Proximal remote sensing: an essential tool for bridging the gap between high-resolution ecosystem monitoring and global ecology. [PDF]

New Phytol
Summary A new proliferation of optical instruments that can be attached to towers over or within ecosystems, or ‘proximal’ remote sensing, enables a comprehensive characterization of terrestrial ecosystem structure, function, and fluxes of energy, water, and carbon.
Pierrat ZA, Magney TS, Richardson WP, Runkle BRK, Diehl JL, Yang X, Woodgate W, Smith WK, Johnston MR, Ginting YRS, Koren G, Albert LP, Kibler CL, Morgan BE, Barnes M, Uscanga A, Devine C, Javadian M, Meza K, Julitta T, Tagliabue G, Dannenberg MP, Antala M, Wong CYS, Santos ALD, Hufkens K, Marrs JK, Stovall AEL, Liu Y, Fisher JB, Gamon JA, Cawse-Nicholson K.   +31 more
europepmc   +2 more sources

Monitoring vegetation condition using microwave remote sensing: the standardized vegetation optical depth index (SVODI) [PDF]

Biogeosciences, 2022
Vegetation conditions can be monitored on a global scale using remote sensing observations in various wavelength domains. In the microwave domain, data from various spaceborne microwave missions are available from the late 1970s onwards.
L. Moesinger, R.-M. Zotta, R. van der Schalie, T. Scanlon, R. de Jeu, W. Dorigo   +5 more
doaj   +1 more source

Global Change in Terrestrial Ecosystem Detected by Fusion of Microwave and Optical Satellite Observations

Remote Sensing, 2021
The detection of global land change via satellite observation is a major challenge in improving the understanding of global environmental change. In this study, we develop a new vegetation index which can be used as a proxy for the fractions of tree ...
Hideharu Nara, Yohei Sawada
doaj   +1 more source

Interannual Variations of Vegetation Optical Depth are Due to Both Water Stress and Biomass Changes

Geophysical Research Letters, 2021
Microwave radiometry can be used to measure vegetation water content through vegetation optical depth (VOD). VOD can vary due to changes in water stress alone, but also scales with aboveground biomass.
Alexandra G. Konings, Nataniel M. Holtzman, Krishna Rao, Liang Xu, Sassan S. Saatchi   +4 more
doaj   +1 more source