Results 31 to 40 of about 772 (153)

Tracking the long-term structure changes of a mature deciduous broadleaf forest stand using digital hemispherical photography

Metsanduslikud Uurimused, 2019
Hemispherical photography provides permanent records of forest canopy structure. We analysed digital hemispherical images taken during the period of 2007–2018 in a mature silver birch stand located in Järvselja, Estonia.
Lang Mait, Pisek Jan
doaj   +1 more source

Estimating Leaf Area Index (LAI) in Vineyards Using the PocketLAI Smart-App

Sensors, 2016
Estimating leaf area index (LAI) of Vitis vinifera using indirect methods involves some critical issues, related to its discontinuous and non-homogeneous canopy.
Francesca Orlando, Ermes Movedi, Davide Coduto, Simone Parisi, Lucio Brancadoro, Valentina Pagani, Tommaso Guarneri, Roberto Confalonieri   +7 more
doaj   +1 more source

HemiPy: A Python module for automated estimation of forest biophysical variables and uncertainties from digital hemispherical photographs

Methods in Ecology and Evolution, 2023
Digital hemispherical photography (DHP) is widely used to derive forest biophysical variables including leaf, plant, and green area index (LAI, PAI and GAI), the fraction of intercepted photosynthetically active radiation (FIPAR), and the fraction of ...
Luke A. Brown, Harry Morris, Sylvain Leblanc, Gabriele Bai, Christian Lanconelli, Nadine Gobron, Courtney Meier, Jadunandan Dash   +7 more
doaj   +1 more source

Forest cover density mapping of Zagros forests using Landsat-9 imagery and ‎hemispherical photographs

پژوهش و توسعه جنگل, 2023
The goal of this study is to see how well the forest canopy density (FCD) model and the GLAMA mobile ‎app estimate the canopy cover density of Zagros forests in Sardasht province. Landsat 9 Operational Land ‎Imager-2 (OLI-2) in 2022 was employed for this
Hadi Beygiheidarlou, Asma Karamat Mirshekarlou, Samira Sasanifar, Bakhtear Khezryan   +3 more
doaj   +1 more source

The estimation of canopy attributes from digital cover photography by two different image analysis methods

iForest - Biogeosciences and Forestry, 2014
Proximal sensing methods using digital photography have gained wide acceptance for describing and quantifying canopy properties. Digital hemispherical photography (DHP) is the most widely used photographic technique for canopy description.
Chianucci F, Chiavetta U, Cutini A
doaj   +1 more source

LiDAR Voxel-Size Optimization for Canopy Gap Estimation

Remote Sensing, 2022
Terrestrial laser scanning of forest structure is used increasingly in place of traditional technologies; however, deriving physical parameters from point clouds remains challenging because LiDAR returns do not have defined areas or volumes.
C. Wade Ross, E. Louise Loudermilk, Nicholas Skowronski, Scott Pokswinski, J. Kevin Hiers, Joseph O’Brien   +5 more
doaj   +1 more source

Comparison of Landsat-8 and Sentinel-2 Data for Estimation of Leaf Area Index in Temperate Forests

Remote Sensing, 2019
With the launch of the Sentinel-2 satellites, a European capacity has been created to ensure continuity of Landsat and SPOT observations. In contrast to previous sensors, Sentinel-2′s multispectral imager (MSI) incorporates three additional ...
Lorenz Hans Meyer, Marco Heurich, Burkhard Beudert, Joseph Premier, Dirk Pflugmacher   +4 more
doaj   +1 more source

How to implement the data collection of leaf area index by means of citizen science and forest gamification?

Silva Fennica
Leaf area index (LAI) is a critical parameter that influences many biophysical processes within forest ecosystems. Collecting in situ LAI measurements by forest canopy hemispherical photography is however costly and laborious.
Shaohui Zhang, Lauri Korhonen, Timo Nummenmaa, Simone Bianchi, Matti Maltamo   +4 more
doaj   +1 more source

Assessment of mangrove ecosystem conditions in Sepulu District, Bangkalan [PDF]

E3S Web of Conferences
The mangrove ecosystem is one of the many coastal and marine natural resources. This ecosystem has many benefits, both for society and the environment.
Syah Achmad Fachruddin, Basyuni Mohammad, Fernanda Orelia, Rahmawati Elisia   +3 more
doaj   +1 more source

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