Results 11 to 20 of about 5,842 (246)

Global Monitoring of the Vegetation Dynamics from the Vegetation Optical Depth (VOD): A Review [PDF]

Remote Sensing, 2020
Vegetation is a key element in the energy, water and carbon balances over the land surfaces and is strongly impacted by climate change and anthropogenic effects. Remotely sensed observations are commonly used for the monitoring of vegetation dynamics and
Frédéric Frappart, Jean-Pierre Wigneron, Xiaojun Li, Xiangzhuo Liu, Amen Al-Yaari, Lei Fan, Mengjia Wang, Christophe Moisy, Erwan Le Masson, Zacharie Aoulad Lafkih, Clément Vallé, Bertrand Ygorra, Nicolas Baghdadi   +12 more
doaj   +3 more sources

SMOS-IC: An Alternative SMOS Soil Moisture and Vegetation Optical Depth Product [PDF]

Remote Sensing, 2017
The main goal of the Soil Moisture and Ocean Salinity (SMOS) mission over land surfaces is the production of global maps of soil moisture (SM) and vegetation optical depth (τ) based on multi-angular brightness temperature (TB) measurements at L-band. The
Roberto Fernandez-Moran, Amen Al-Yaari, Arnaud Mialon, Ali Mahmoodi, Ahmad Al Bitar, Gabrielle De Lannoy, Nemesio Rodriguez-Fernandez, Ernesto Lopez-Baeza, Yann Kerr, Jean-Pierre Wigneron   +9 more
doaj   +7 more sources

Statistical Downscaling Method for Vegetation Optical Depth Based on NDVI

应用气象学报
The microwave vegetation index, known as vegetation optical depth (VOD), is a dimensionless vegetation index.VOD is an important parameter for retrieving soil moisture and surface biomass.
Wang Xinyu, Fang Shibo, Han Jiahao
doaj   +2 more sources

A UGV-Based Forest Vegetation Optical Depth Mapping Using GNSS Signals

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
In this study, we conducted an empirical investigation on mobile global navigation satellite system (GNSS) transmissometry (GNSS-T) measurements to explore vegetation optical depth (VOD).
Abesh Ghosh, Md Mehedi Farhad, Dylan Boyd, Mehmet Kurum   +3 more
doaj   +2 more sources

Temperature Is Likely an Important Omission in Interpreting Vegetation Optical Depth

Geophysical Research Letters
Vegetation optical depth (VOD) satellite microwave retrievals provide significant insights into vegetation water content and responses to hydroclimatic changes. While VOD variations are commonly linked to dry biomass and live fuel moisture content (LFMC),
Meng Zhao, Vincent Humphrey, Andrew F. Feldman, Alexandra G. Konings   +3 more
doaj   +3 more sources

Vegetation optical depth as a key predictor for fire risk escalation

Ecological Informatics
Excluding direct consideration of vegetation dynamics reduces the accuracy in fire risk estimation. Satellite retrievals of vegetation dynamics can enhance the fire risk prediction when used as indicators of fuel water status and fuel load.
Dinuka Kankanige, Yi Y. Liu, Ashish Sharma   +2 more
doaj   +2 more sources

An alternative AMSR2 vegetation optical depth for monitoring vegetation at large scales

Remote Sensing of Environment, 2021
Abstract Vegetation optical depth (VOD) retrieved from microwave observations has been found to be useful to monitor the dynamics of the vegetation features at global scale. Particularly, many applications could be developed in several fields of research (ecology, water and carbon cycle, etc.) from VOD products retrieved from the SMOS and SMAP ...
Wang, Mengjia, Fan, Lei, Frappart, Frédéric, Ciais, Philippe, Sun, Rui, Liu, Yi, Li, Xiaojun, Liu, Xiangzhuo, Moisy, Christophe, J.-P., Wigneron   +9 more
openaire   +4 more sources

Global L-Band Vegetation Volume Fraction Estimates for Modeling Vegetation Optical Depth

2021 IEEE International Geoscience and Remote Sensing Symposium IGARSS, 2021
The attenuation of microwave emissions through the canopy is quantified by the vegetation optical depth (VOD), which is related to the amount of water, the biomass and the structure of vegetation. To provide microwave-derived plant water estimates, one must account for biomass/structure contributions in order to extract the water component from the VOD.
Chaparro Danon, David, Jagdhuber, Thomas, Piles Guillem, María, Entekhabi, Dara, Jonard, François, Fluhrer, Anke, Feldman, Andrew F., Vall-Llossera Ferran, Mercedes Magdalena, Camps Carmona, Adriano José   +8 more
openaire   +2 more sources

Remote sensing of vegetation dynamics in agro-ecosystems using smap vegetation optical depth and optical vegetation indices [PDF]

2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2017
The ESA's SMOS and the NASA's SMAP missions, launched in 2009 and 2015, respectively, are the first two missions having on-board L-band microwave sensors, which are very sensitive to the water content in soils and vegetation. Focusing on the vegetation signal at L-band, we have implemented an inversion approach for SMAP that allows deriving vegetation ...
Piles, Maria, Chaparro, David, Entekhabi, Dara, Konings, Alexandra G., Jagdhuber, Thomas, Camps-Valls, G.   +5 more
openaire   +3 more sources

EVALUATION OF MICROWAVE VEGETTION INDEX (MVI) IN MULTI-FREQUENCY AND MULTI-ANGLE [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2017
Microwave portion of the electromagnetic spectrum are effective for observations of vegetation not only to leaf but also woody parts of vegetation. Specifically, microwave emissivity varies strongly with surface roughness, polarization, look–angle and ...
S. Talebi, J. Shi, T. Zhao, Y. Li, X. Chuan, L. Chai   +5 more
doaj   +1 more source