Results 21 to 30 of about 10,963 (248)

Comparative Evaluation of Algorithms for Leaf Area Index Estimation from Digital Hemispherical Photography through Virtual Forests

Remote Sensing, 2021
The in situ leaf area index (LAI) measurement plays a vital role in calibrating and validating satellite LAI products. Digital hemispherical photography (DHP) is a widely used in situ forest LAI measurement method.
Jing Liu, Longhui Li, Markku Akerblom, Tiejun Wang, Andrew Skidmore, Xi Zhu, Marco Heurich   +6 more
doaj   +1 more source

Comparison of Seven Inversion Models for Estimating Plant and Woody Area Indices of Leaf-on and Leaf-off Forest Canopy Using Explicit 3D Forest Scenes

Remote Sensing, 2018
Optical methods require model inversion to infer plant area index (PAI) and woody area index (WAI) of leaf-on and leaf-off forest canopy from gap fraction or radiation attenuation measurements.
Jie Zou, Yinguo Zhuang, Francesco Chianucci, Chunna Mai, Weimu Lin, Peng Leng, Shezhou Luo, Bojie Yan   +7 more
doaj   +1 more source

A Modified Beer–Lambert–Bouguer Law for Nonrandom Distributions and Its Application in Gap Probability Calculations for Heterogeneous Canopies

Journal of Advances in Modeling Earth Systems, 2023
The three‐dimensional (3D) structure of vegetation canopy strongly influence the absorption and reflection of radiation at the land surface. The gap probability is one primary indicator of the canopy structure.
Qing He, Daren Lyu
doaj   +1 more source

Seasonal Effect of the Vegetation Clumping Index on Gross Primary Productivity Estimated by a Two-Leaf Light Use Efficiency Model

Remote Sensing, 2023
Recently, light use efficiency (LUE) models driven by remote sensing data have been widely employed to estimate the gross primary productivity (GPP) of different terrestrial ecosystems at global or regional scales.
Zhilong Li, Ziti Jiao, Chenxia Wang, Siyang Yin, Jing Guo, Yidong Tong, Ge Gao, Zheyou Tan, Sizhe Chen   +8 more
doaj   +1 more source

Real-Time Software for the Efficient Generation of the Clumping Index and Its Application Based on the Google Earth Engine

Remote Sensing, 2022
Canopy clumping index (CI) is a key structural parameter related to vegetation phenology and the absorption of radiation, and it is usually retrieved from remote sensing data based on an empirical relationship with the Normalized Difference between ...
Yu Li, Hongliang Fang
doaj   +1 more source

Estimation of leaf area and clumping indexes of crops with hemispherical photographs [PDF]

Agricultural and Forest Meteorology, 2008
Among many indirect approaches to retrieve effective leaf area index (LAI), hemispherical photography is now widely used by the scientific community in forestry applications. A recent software (CAN_EYE) is used to estimate effective and true LAI from unidirectional gap fractions measured in crops.
Demarez, Valérie, Duthoit, Sylvie, Baret, Frédéric, Weiss, Marie, Dedieu, Gérard   +4 more
openaire   +3 more sources

Influence of Snow on the Magnitude and Seasonal Variation of the Clumping Index Retrieved from MODIS BRDF Products

Remote Sensing, 2018
The foliage Clumping Index (CI) is an important vegetation structure parameter that allows for the accurate separation of sunlit and shaded leaves in a canopy.
Yadong Dong, Ziti Jiao, Siyang Yin, Hu Zhang, Xiaoning Zhang, Lei Cui, Dandan He, Anxin Ding, Yaxuan Chang, Shengtian Yang   +9 more
doaj   +1 more source

Extracting Leaf Area Index by Sunlit Foliage Component from Downward-Looking Digital Photography under Clear-Sky Conditions

Remote Sensing, 2015
The development of near-surface remote sensing requires the accurate extraction of leaf area index (LAI) from networked digital cameras under all illumination conditions.
Yelu Zeng, Jing Li, Qinhuo Liu, Ronghai Hu, Xihan Mu, Weiliang Fan, Baodong Xu, Gaofei Yin, Shengbiao Wu   +8 more
doaj   +1 more source

Generation of a 16 m/10-day fractional vegetation cover product over China based on Chinese GaoFen-1 observations: method and validation

International Journal of Digital Earth, 2023
As China has recently launched the GaoFen-1 satellite (GF-1) carrying on the wide-field view (WFV) sensor, it is a challenging task to make full use of its observations to produce the fractional vegetation cover (FVC).
Jing Zhao, Jing Li, Qinhuo Liu, Baodong Xu, Xihan Mu, Yadong Dong   +5 more
doaj   +1 more source

Retrieving the Leaf Area Index of Dense and Highly Clumped Moso Bamboo Canopies from Sentinel-2 MSI Data

Remote Sensing
The effects of leaf clumping on leaf area index (LAI, m2·m−2) retrieval have been proved by several studies. For dense and highly clumped Moso bamboo canopies, LAI is usually retrieved using the SAIL-series models that do not account for leaf clumping ...
Weiliang Fan, Jun Wu, Guang Zheng, Qian Zhang, Xiaojun Xu, Huaqiang Du, Mengxiang Zheng, Kexin Zhang, Feng Zhang   +8 more
doaj   +1 more source