Results 191 to 200 of about 106,574 (240)

Sensitivity analysis for leaf area index (LAI) estimation from CHRIS/PROBA data

Frontiers of Earth Science, 2014
Sensitivity analyses were conducted for the retrieval of vegetation leaf area index (LAI) from multiangular imageries in this study. Five spectral vegetation indices (VIs) were derived from Compact High Resolution Imaging Spectrometer onboard the Project for On Board Autonomy (CHRIS/PROBA) images, and were related to LAI, acquired from in situ ...
Jianjun Cao, Zhujun Gu, Jianhua Xu, Yushan Duan, Yongmei Liu, Yongjuan Liu, Dongliang Li   +6 more
openaire   +1 more source

Estimating Urban Leaf Area Index (LAI) of Individual Trees with Hyperspectral Data

Photogrammetric Engineering & Remote Sensing, 2012
This study estimated leaf area index (LAI) of individual urban trees as a function of spectral features derived from airborne hyperspectral data. Candidate features included spectral indexes, principal components, and calibrated reflectance values. Hyperspectral images were acquired over Provo, Utah area, and LAI of 204 deciduous trees was measured in ...
Ryan R. Jensen, Perry J. Hardin, Andrew J. Hardin   +2 more
openaire   +1 more source

Evaluation of LAI-2000 for leaf area index monitoring in paddy rice

Field Crops Research, 2006
Leaf area index (LAI) is a variable of primary importance for crop monitoring and it is usually measured by labor intensive destructive field sampling. Indirect non-destructive estimates by optical instruments are a competitive alternative to direct methods for frequent measurements and over large areas.
Stroppiana D, Boschetti M, Confalonieri R, Bocchi S, Brivio PA   +4 more
openaire   +2 more sources

Forest Leaf Area Index (LAI) Estimation Using Airborne Discrete‐Return Lidar Data

Chinese Journal of Geophysics, 2013
AbstractThe Leaf Area Index (LAI) is one of the most important parameters, which controls biological and physical processes associated with vegetation on the Earth's surface, such as photosynthesis, respiration, transpiration, carbon and nutrient cycles, and rainfall interception.
LUO She‐Zhou, WANG Cheng, ZHANG Gui‐Bin, XI Xiao‐Huan, LI Gui‐Cai   +4 more
openaire   +1 more source

A sensitivity analysis of a surface energy balance model to LAI (Leaf Area Index)

SPIE Proceedings, 2008
The LAI is a key parameter in hydrological processes, especially in the physically based distribution models. It is a critical ecosystem attribute since physiological processes such as photosynthesis, transpiration and evaporation depend on it. The diffusion of water vapor, momentum, heat and light through the canopy is regulated by the distribution ...
MALTESE, Antonino, CANNAROZZO, Marcella, CAPODICI, Fulvio, LA LOGGIA, Goffredo, SANTANGELO, Tanino   +4 more
openaire   +2 more sources

Sentinel 1 response to cereal leaf area index (LAI): Study case for central Tunisia

2016 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2016
Leaf area index (LAI) is very used to reveal the vegetation situation. To estimate the LAI for cereal, both direct and indirect methods have been used. In particular, remote sensing is a fast and reliable technique to develop the LAI estimation models.
Barbouchi, Meriem, Abdelfattah, Riadh, Chokmani, Karem, Ben Aissa, Nadhira, Mhammed, Hatem Cheikh   +4 more
openaire   +2 more sources

Retrieving Leaf Area Index From Landsat Using MODIS LAI Products and Field Measurements

IEEE Geoscience and Remote Sensing Letters, 2014
Land surface models that operate at multiple spatial resolutions require consistent leaf area index (LAI) inputs at each scale. In order to produce LAI from Landsat imagery that is consistent with the Moderate Resolution Imaging Spectroradiometer (MODIS) LAI product and with in situ measurements, an improved regression tree mapping approach has been ...
null Feng Gao, Martha C. Anderson, William P. Kustas, Rasmus Houborg   +3 more
openaire   +1 more source

Evaluation of MODIS surface reflectance products for wheat leaf area index (LAI) retrieval

ISPRS Journal of Photogrammetry and Remote Sensing, 2008
The accuracy of leaf area index (LAI) retrieval depends critically on the quality of the input reflectance. MODIS Collection 4 (C4) and Collection 5 (C5) land surface reflectance data are used for wheat LAI retrieval. Results are compared with in situ measurements.
Yonghong Yi, Dawen Yang, Jingfeng Huang, Daoyi Chen   +3 more
openaire   +1 more source

Measuring Leaf Area Index with the Li‐Cor LAI‐2000 in Pine Stands

Ecology, 1994
Because leaf area index (projected one-sided leaf surface area per unit ground surface area, hereafter referred to as LAI) is a critical variable in models that attempt to simulate carbon, nutrient, water, and energy fluxes for forest ecosystems (e.g., Running and Coughlan 1988), techniques to rapidly estimate LAI over large areas are in great demand ...
Godelieve Deblonde, Margaret Penner, Alain Royer   +2 more
openaire   +1 more source

Are leaf area index (LAI) and flowering related to oil productivity in peppermint?

Flavour and Fragrance Journal, 1994
AbstractLeaf area index (LAI) was calculated in flowering (FP) and flower bud removed (NFP) peppermint (Mentha x piperita L.) plants and related to essential oil productivity. The LAI was calculated using computerized image analysis, while the essential oils were distilled from leaves and flowers separately and analysed by GC–MS.
MAFFEI, Massimo Emilio, MUCCIARELLI, Marco, SCANNERINI, Silvano   +2 more
openaire   +1 more source