Results 41 to 50 of about 772 (153)

Comparison of Smartphone and Drone Lidar Methods for Characterizing Spatial Variation in PAI in a Tropical Forest

Remote Sensing, 2020
Estimating leaf area index (LAI) and assessing spatial variation in LAI across a landscape is crucial to many ecological studies. Several direct and indirect methods of LAI estimation have been developed and compared; however, many of these methods are ...
Tamara E. Rudic, Lindsay A. McCulloch, Katherine Cushman   +2 more
doaj   +1 more source

Usage of Lidar Data for Leaf Area Index Estimation

GeoScience Engineering, 2014
Leaf area index (LAI) can be measured either directly, using destructive methods, or indirectly using optical methods that are based on the tight relationship between LAI and canopy light transmittance.
Sabol Jan, Patočka Zdeněk, Mikita Tomáš   +2 more
doaj   +1 more source

Comparison of output results from two programmes for hemispherical image analysis: Gap Light Analyser and WinScanopy

Journal of Forest Science, 2010
We compare the results of the analysis of hemispherical images (of a broadleaved and a coniferous forest) obtained using the Gap Light Analyser (GLA) software and the results obtained by analyzing the same images with the aid of WinScanopy.
B. Jarčuška, S. Kucbel, P. Jaloviar
doaj   +1 more source

Estimating light environment in forests with a new thresholding method for hemispherical photography [PDF]

Canadian Journal of Forest Research, 2016
Light environment estimates derived from hemispherical photography are known to be affected by variations in sky illumination. During photo acquisition, rapid changes in sky illumination can occur and will result in changes in detected canopy gap size and frequency.
Zhao, Kangning, He, Fangliang
openaire   +1 more source

Reliability of canopy photography for forest ecology and biodiversity studies

Ecological Indicators
Understory is a key component of forest biodiversity. The structure of the forest stand and the horizontal composition of the canopy play a major role on the light regime of the understory, which in turn affects the abundance and the diversity of the ...
Anouk von Meijenfeldt, Francesco Chianucci, Francesca Rigo, Jente Ottenburghs, Andreas Hilpold, Marco Mina   +5 more
doaj   +1 more source

COMPARING OPTICALAND DIRECT METHODS FOR LEAFAREA INDEX DETERMINATION IN A MAIZE CROP

Journal of Agricultural Engineering, 2010
Leaf area index (LAI) is a crucial variable in the modelling of many hydrological processes. Destructive sampling of LAI is extremely time-consuming, thus not suitable for monitoring temporal/spatial variations of the variable.
Arianna Facchi, Gabriele Baroni, Mirco Boschetti, Claudio Gandolfi   +3 more
doaj   +1 more source

Condition and zonation of mangrove ecosystems in the small islands around the area crossed by the equatorial line of North Maluku Province

Depik Jurnal
The South Halmahera Islands feature a comprehensive marine coastal ecology. The ecosystems found were seagrass, mangrove and coral reef ecosystems.
Najamuddin Najamuddin, Abdurrachman Baksir, Nebuchadnezzar Akbar, Firdaut Ismail, Abdul Ajiz Siolimbona, Dondy Arafat, Rustam E Paembonan, Raismin Kotta, Beginer Subhan, Irmalita Tahir, Nyoman MN Natih, Eko S Wibowo, Ikbal Marus, I Wayan Nurjaya, Dietriech Geoffrey Bengen   +14 more
doaj   +1 more source

Measurement of Crown Cover and Leaf Area Index Using Digital Cover Photography and Its Application to Remote Sensing

Remote Sensing, 2009
Digital cover photography (DCP) is a high resolution, vertical field-of-view method for ground-based estimation of forest metrics, and has advantages over fisheye sensors owing to its ease of application and high accuracy. We conducted the first thorough
Craig Macfarlane, Burak Pekin
doaj   +1 more source

A manual for analysis of hemispherical canopy photography

, 1989
Hemispherical canopy photography involves taking photographs through a hemispherical (fisheye) lens pointed upward from beneath a plant canopy. The resulting photographs can be analyzed to determine the geometry of canopy openings and to calculate potential light penetration.
openaire   +2 more sources

Tree shading factor as input for thermal model through hemispherical photography

Building Simulation Conference Proceedings, 2021
Solar irradiation contributes to heat gain through building envelopes and has a significant impact on building energy consumption. Trees help reduce incident irradiation and need to be considered as exterior obstructions in energy models. Deploying robust models in early design stages is integral to designing energy efficient buildings.
Srivastava, Suyashi, Puchalapalli, Swati, Maskarenj, Marshal, 2021 Building Simulation Conference   +3 more
openaire   +2 more sources