Results 231 to 240 of about 10,043,636 (269)

Review of methods for in situ leaf area index (LAI) determination

Agricultural and Forest Meteorology, 2004
Marie Weiss, Frédéric Baret, P Coppin
exaly   +2 more sources

Retrieving Leaf Area Index (LAI) Using Remote Sensing: Theories, Methods and Sensors [PDF]

Sensors, 2009
The ability to accurately and rapidly acquire leaf area index (LAI) is an indispensable component of process-based ecological research facilitating the understanding of gas-vegetation exchange phenomenon at an array of spatial scales from the leaf to the landscape.
L Monika Moskal, Guang Zheng
exaly   +4 more sources

Estimation of leaf area index (LAI) using POLInSAR: Preliminary research

2011 IEEE International Geoscience and Remote Sensing Symposium, 2011
Polarimetric interferometric synthetic aperture radar (POLInSAR) has been used to extract the forest height successfully. Leaf area index (LAI) is an important parameter for the estimation of forest biomass, however presently the most of LAI extraction approaches are based on optical data.
Wenxue Fu, Huadong Guo, Xinwu Li
openaire   +2 more sources

Continuous Leaf Area Index (LAI) Observation in Forests: Validation, Application, and Improvement of LAI-NOS

Forests
The leaf area index (LAI) is one of the core parameters reflecting the growth status of vegetation. The continuous long-term observation of the LAI is key when assessing the dynamic changes in the energy exchange of ecosystems and the vegetation’s response indicators to climate change.
Ainong Li, Yunping Chen, Zhengjian Zhang
exaly   +2 more sources

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

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

Rice Leaf Area Index (LAI) estimates from hyperspectral data

SPIE Proceedings, 2003
In this paper, we report some correlation analysis results between hyperspectral data in the spectral range of approximately 350nm-935nm and LAI of rice. Hyperspectral measurements were taken using an Analytical Spectral Devices (ASD) FieldSpec UV/VNIR Spectroradiometer at the experiment farm in 1999 and 2000.The potential of hyperspectral data for ...
Xiuzhen Wang, Jingfeng Huang, Yunmei Li, Renchao Wang   +3 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

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

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 ...
William P. Kustas, Feng Gao, Rasmus Houborg   +2 more
exaly   +2 more sources