Results 211 to 220 of about 5,842 (246)

Vegetation Optical Depth Retrieval from CYGNSS Data

2021 IEEE International Geoscience and Remote Sensing Symposium IGARSS, 2021
The Cyclone Global Navigation Satellite System (CYGNSS) observation received the Global Positioning System (GPS) signals with a revisit time in the range of 2.8 to 7.2 hours and have about a few kilometers of spatial resolution for coherent reflection and ∼25 km for incoherent reflection [1].
Xiaolan Xu, Simon Yueh, Rashmi Shah, Akiko Hayashi   +3 more
openaire   +1 more source

New Ascat Vegetation Optical Depth (IB-VOD) Retrievals Over Africa

IGARSS 2020 - 2020 IEEE International Geoscience and Remote Sensing Symposium, 2020
Vegetation Optical Depth (VOD) plays an important role in monitoring the earth ecosystems. There are many VOD products released based on different satellites and frequencies. But most of the VOD products are derived from passive microwave data, and very few active VOD products have been released to date. This study investigated retrievals of the active
Liu, Xiangzhuo, Wigneron, J.-P., Frappart, Frédéric, Baghdadi, Nicolas, Zribi, Mehrez, Jagdhuber, Thomas, Li, Xiaojun, Wang, Mengjia, Fan, Lei, Moisy, Christophe   +9 more
openaire   +1 more source

Relationship between vegetation optical depth and effective optical depth using simulated data

2016 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2016
Effective vegeation optical depth (VOD) is widely used for land surface parameters retrieval. It is necessary to reseach the relationship between the effective value and the theoretical value of VOD. In this paper, we have used a least square method to obtain effective VOD using simulation data and explore the relationship between effective VOD and ...
Yunqing Li, Jiancheng Shi
openaire   +1 more source

First Retrievals of ASCAT IB VOD (Vegetation Optical Depth) at Global Scale

2021 IEEE International Geoscience and Remote Sensing Symposium IGARSS, 2021
Global and long-term vegetation optical depth (VOD) dataset are very useful to monitor the dynamics of the vegetation features, climate and environmental changes. In this study, the radar-based global ASCAT (Advanced SCATterometer) IB (INRAE-BORDEAUX) VOD was retrieved using a model which was recently calibrated over Africa.
Liu, Xiangzhuo, Wigneron, J.-P., Frappart, Frederic, Baghdadi, Nicolas, Zribi, Mehrez, Jagdhuber, Thomas, Ciais, Philippe, Li, Xiaojun, Wang, Mengjia, Fan, Lei, Ygorra, Bertrand, Ma, Hongliang, Xing, Zanpin, Al-Yaari, A., Fernandez-Moran, Roberto, Moisy, Christophe   +15 more
openaire   +1 more source

Frequency-Dependence of Vegetation Optical Depth-Derived Isohydriciy Estimates

IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium, 2018
Passive microwave radiometry-derived vegetation optical depth measurements can be used to map how different ecosystems are sensitive to drought. This is quantified using the plant physiological concept of isohydricity. VOD-derived effective ecosystem-scale isohydricity maps have recently become commonly used, but their sensitivity to the underlying VOD
Alexandra G. Konings, Mostafa Momen
openaire   +1 more source

Effective vegetation optical depth retrieval using microwave vegetation indices from WindSat data for short vegetation

Journal of Applied Remote Sensing, 2015
Vegetation optical depth (VOD) and effective vegetation optical depth (EVOD) are key factors for estimating soil moisture and vegetation parameters. Microwave vegetation indices (MVIs, including A and B parameters) have been recently developed for short-vegetation covered surfaces.
Yunqing Li, Jiancheng Shi, Tianjie Zhao
openaire   +1 more source

Multifrequency microwave emission for estimating optical depth and vegetation biomass

2016 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2016
Vegetation features have been assessed by using microwave radiometric data (AMSR-E/2, SMAP) in order to retrieve vegetation biomass maps on a global scale. The tau-omega model has been used for estimating the vegetation optical depth (tau, ?) from microwave data at different frequencies.
Paloscia S, Santi E, Pampaloni P, Pettinato S   +3 more
openaire   +3 more sources

Retrieve optical depth using microwave vegetation indices from WindSat data

2014 IEEE Geoscience and Remote Sensing Symposium, 2014
Obtaining reliable vegetation optical depth ( τ , tau) is essential for vegetation parameter estimation and soil moisture retrieval. In this paper, a lookup table method was developed to retrieve optical depth using MVIs, which can derive the optical depth and single scattering albedo simultaneously without any auxiliary data. The lookup table method
null Yunqing Li, null Jiancheng Shi, null Tianjie Zhao, null Tao Zhang   +3 more
openaire   +1 more source

Monitoring tropical forests under a functional perspective with satellite‐based vegetation optical depth

Global Change Biology, 2020
AbstractMonitoring ecosystem functions in forests is a priority in a climate change scenario, as climate‐induced events may initially alter the functions more than slow‐changing attributes, such as biomass. The ecosystem functional properties (EFPs) are quantities that characterize key ecosystem processes.
Vaglio Laurin G., Vittucci C., Tramontana G., Ferrazzoli P., Guerriero L., Papale D.   +5 more
openaire   +3 more sources

Interpreting Vegetation Optical Depth (VOD) using detailed destructive vegetation sampling of a corn canopy

2020
<p>Vegetation Optical Depth (VOD) is directly related to Vegetation Water Content (VWC), which can be used in different applications including crop health monitoring, water resources management and drought detection. Moreover, VOD is used to account for the attenuating effect of vegetation in soil moisture retrieval using ...
Saeed Khabbazan, Ge Gao, Paul Vermunt, Susan Steele-Dunne, Jasmeet Judge, Mariette Vreugdenhil   +5 more
openaire   +1 more source