Results 191 to 200 of about 5,055 (231)

The role of a novel normalized dynamically adjusted vegetation index (NDAVI) based on remotely sensed absorption coefficient for estimating crop fAPAR: a case study of rice (Oryza sativa L.)

Plant Phenomics
The fraction of Absorbed Photosynthetically Active Radiation (fAPAR) is a crucial indicator of photosynthetic characteristics in crop growth monitoring and yield estimation.
Shenghui Fang, Yuanjin Li, Mengyu Ge, Ni Yuan, Yi Peng, Yan Gong, YaDong Liu, Renshan Zhu, Xianting Wu   +8 more
semanticscholar   +1 more source

Remote sensing of seasonal variation of LAI and fAPAR in Pakistan under changing climate using machine learning

Fusion Journal of Engineering and Sciences
Climate change represents an intense threat to terrestrial ecosystems, influencing vegetation dynamics that are essential for ecosystem functionality and agricultural yields.
Mustajab Ali, Usman Ali
semanticscholar   +1 more source

Validation of MODIS FAPAR products in Hulunber grassland of China

2010 IEEE International Geoscience and Remote Sensing Symposium, 2010
Fraction of absorbed photosynthetically active radiation (FAPAR) is one of key variables required in modeling primary production and global climate. FAPAR can be derived from satellite images, for example the MODIS FAPAR. However, validation of the product is a prerequisite for using it to estimate local net primary production (NPP).
Gang Li, Daolong Wang, Shimin Liu, Wenjie Fan, Hua Zhang, Xiaoping Xin, Hongbin Zhang   +6 more
openaire   +1 more source

Remote Sensing Analysis of High-Density Canopy fAPAR Considering the Absorption Ratio of Senescent Leaves

IEEE International Geoscience and Remote Sensing Symposium
The fraction of absorbed photosynthetically active radiation (fAPAR) is an important biophysical characteristic in models of vegetation productivity. Synoptic estimation of fAPAR has been performed by using Normalized Difference Vegetation Index(NDVI) as
Yuanjin Li, Ni Yuan, Shenghui Fang, Chaoran Zhang, Longfei Ma, Yi Peng, Yan Gong   +6 more
semanticscholar   +1 more source

Regional drought monitoring using phenologicallytuned biomass production estimates from SPOTVEGETATION FAPAR

2013 Second International Conference on Agro-Geoinformatics (Agro-Geoinformatics), 2013
Monitoring the impact of drought on vegetation conditions is a critical activity for assessing food security in semi-arid and arid countries in Africa. Remote sensing from space offers a unique opportunity to obtain consistent and timely information over large and inaccessible areas where field observations are scattered, inhomogeneous or frequently ...
M Meroni, D Fasbender, F Kayitakire, G Pini, F Rembold, F Urbano, M Verstraete   +6 more
openaire   +1 more source

FAPAR and BRDF simulation for row crop using Monte Carlo method

2014 IEEE Geoscience and Remote Sensing Symposium, 2014
Row crop is an important cultivation form in China. It is considered to be a transitional canopy structure between continuous vegetation and discrete vegetation. Lots of physical models of row crop were established to invert vegetation parameters of row crop. Monte Carlo model is a reliable reference for those physical models.
null Beitong Zhang, null Wenjie Fan, null Xiru Xu, null Yuan Liu   +3 more
openaire   +1 more source

The spatial scaling effect of canopy FAPAR retrieved by remote sensing

2014 IEEE Geoscience and Remote Sensing Symposium, 2014
Climate and land-atmosphere models rely on accurate land-surface parameters, such as the Fraction of Absorbed Photo synthetically Active Radiation (FAPAR). It is known that FAPAR values retrieved from remote sensing images suffer from scaling effects. Scaling transformation aims to derive accurate FAPAR values at a specific scale from values at other ...
null Lu Wang, null Wenjie Fan, null Xiru Xu, null Yuan Liu   +3 more
openaire   +1 more source

Spectral Unmixing of Airborne and Ground-Based Imaging Spectroscopy for Pigment-Specific FAPAR and Sun-Induced Fluorescence Interpretation

Remote Sensing
Accurate quantification of photosynthetically active radiation absorbed by chlorophyll (fAPARChla) and the corresponding fluorescence quantum efficiency (FQE) is critical for understanding vegetation productivity.
Ana B. Pascual-Venteo, A. Pérez-Suay, M. Morata, A. Moncholí, M. Cendrero-Mateo, Jorge Vicent Servera, B. Siegmann, Shari Van Wittenberghe   +7 more
semanticscholar   +1 more source

Estimation of LAI, fAPAR and fCover of Sahel rangelands (Gourma, Mali)

Agricultural and Forest Meteorology, 2014
Abstract Leaf area index, LAI , fraction of absorbed photosynthetic active radiation, fAPAR , and vegetation cover fraction, fCover , drive the main vegetation canopy processes and are key variables in ecosystem, climate, hydrology and biogeochemistry models. The present study aims to evaluate the joint use of hemispherical photographs and the CAN-
E. Mougin, V. Demarez, M. Diawara, P. Hiernaux, N. Soumaguel, A. Berg   +5 more
openaire   +1 more source

Assessing uncertainties of in situ FAPAR measurements across different forest ecosystems

2020
Carbon balances are important for understanding global climate change. Assessing such balances on a local scale depends on accurate measurements of material flows to calculate the productivity of the ecosystem. The productivity of the Earth's biosphere, in turn, depends on the ability of plants to absorb sunlight and assimilate biomass.
openaire   +1 more source