Results 21 to 30 of about 582 (135)

Potential of Automated Digital Hemispherical Photography and Wireless Quantum Sensors for Routine Canopy Monitoring and Satellite Product Validation

2021 IEEE International Geoscience and Remote Sensing Symposium IGARSS, 2021
To better characterize the temporal dynamics of vegetation biophysical variables, a variety of automated in situ measurement techniques have been developed in recent years.
L. Brown, H. Morris, E. Albero, E. López-Baeza, Frank Tiedemann, L. Siebicke, A. Knohl, Carolina da Silva Gomes, Gabriele Bai, C. Lerebourg, N. Gobron, C. Lanconelli, M. Clerici, D. Culvenor, J. Dash   +14 more
semanticscholar   +1 more source

Towards mapping biodiversity from above: Can fusing lidar and hyperspectral remote sensing predict taxonomic, functional, and phylogenetic tree diversity in temperate forests?

Global Ecology and Biogeography, Volume 31, Issue 7, Page 1440-1460, July 2022., 2022
Abstract Aim Rapid global change is impacting the diversity of tree species and essential ecosystem functions and services of forests. It is therefore critical to understand and predict how the diversity of tree species is spatially distributed within and among forest biomes.
Aaron G. Kamoske, Kyla M. Dahlin, Quentin D. Read, Sydne Record, Scott C. Stark, Shawn P. Serbin, Phoebe L. Zarnetske, Maria Dornelas   +7 more
wiley   +1 more source

Deriving Leaf Area Index Reference Maps Using Temporally Continuous In Situ Data: A Comparison of Upscaling Approaches

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2021
To further progress the validation of global leaf area index (LAI) products, temporally continuous reference data are a key requirement, as periodic field campaigns fail to adequately characterize temporal dynamics.
Luke A. Brown, Booker O. Ogutu, Fernando Camacho, Beatriz Fuster, Jadunandan Dash   +4 more
doaj   +1 more source

Monitoring spring phenology of individual tree crowns using drone‐acquired NDVI data

Remote Sensing in Ecology and Conservation, Volume 7, Issue 2, Page 227-244, June 2021., 2021
We present an analysis of a normalised difference vegetation index (NDVI) time‐series of drone image data acquired with a lightweight multi‐spectral sensor (Parrot Sequoia, (Parrot, France)) at the individual crown and species’ level over a highly heterogeneous ecosystem during a period of spring green‐up. The identified relative timing of green‐up per
Dominic Fawcett, Jonathan Bennie, Karen Anderson   +2 more
wiley   +1 more source

AN INTERCOMPARISON OF PASSIVE TERRESTRIAL REMOTE SENSING TECHNOLOGIES TO DERIVE LAI AND CANOPY COVER METRICS [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2012
Forest indicators such as Leaf Area Index (LAI) and vegetation cover type are recognised as Essential Climate Variables (ECVs) which support the '…research, modelling, analysis, and capacity-building activities…' requirements of the United Nations ...
W. L. Woodgate
doaj   +1 more source

Using Terrestrial Laser Scanning to Estimate Canopy Structure in Peatland Conifers Under a Climate Manipulation [PDF]

, 2023
Northern peatlands are major terrestrial carbon sinks, storing 415 ± 150 Gt of carbon. The composition of peatland vegetation affects this carbon storage capacity, and thus quantifying the vegetation helps to constrain uncertainty in peatland carbon ...
Seibert, Angela D.
core   +2 more sources

Low-cost unmanned aerial vehicle-based digital hemispherical photography for estimating leaf area index: a feasibility assessment

, 2020
Unmanned aerial vehicles (UAVs) have the potential to provide highly detailed information on vegetation status useful in precision agriculture. However, challenges are associated with existing techniques for UAV-based retrieval of vegetation biophysical ...
L. Brown, David H. Sutherland, J. Dash
semanticscholar   +1 more source

Fundus autofluorescence, spectral‐domain optical coherence tomography, and histology correlations in a Stargardt disease mouse model

The FASEB Journal, Volume 34, Issue 3, Page 3693-3714, March 2020., 2020
Abstract Stargardt disease (STGD1), known as inherited retinal dystrophy, is caused by ABCA4 mutations. The pigmented Abca4−/− mouse strain only reflects the early stage of STGD1 since it is devoid of retinal degeneration. This blue light‐illuminated pigmented Abca4−/− mouse model presented retinal pigment epithelium (RPE) and photoreceptor ...
Yuan Fang, Alexander Tschulakow, Tatjana Taubitz, Barbara Illing, Antje Biesemeier, Sylvie Julien‐Schraermeyer, Roxana A. Radu, Zhichun Jiang, Ulrich Schraermeyer   +8 more
wiley   +1 more source

Estimation of leaf area index in eucalypt forest with vertical foliage, using cover and fullframe fisheye photography [PDF]

, 2007
This study compared fullframe fisheye photography and cover photography with destructive leaf area index (L) estimation and the Licor LAI-2000 plant canopy analyser (PCA) in plantations of the vertical leaved species Eucalyptus globulus.
Adams, MA, Arndt, SK, Eamus, D, Edgar, AC, Livesley, SJ, Macfarlane, C, White, DA   +6 more
core   +1 more source

Variability and bias in active and passive ground-based measurements of effective plant, wood and leaf area index [PDF]

, 2018
In situ leaf area index (LAI) measurements are essential to validate widely-used large-area or global LAI products derived, indirectly, from satellite observations.
Armston, John, Calders, Kim, Disney, Mathias, Lewis, Philip, Nightingale, Joanne, Origo, Niall, Woodgate, William   +6 more
core   +2 more sources