Results 61 to 70 of about 1,457,519 (305)

Using multiscale lidar to determine variation in canopy structure from African forest elephant trails [PDF]

open access: yes
Recently classified as a unique species by the IUCN, African forest elephants (Loxodonta cyclotis) are critically endangered due to severe poaching. With limited knowledge about their ecological role due to the dense tropical forests they inhabit in ...
Jantz, Patrick   +17 more
core   +1 more source

Change detection of mountain birch using multi-temporal ALS point clouds [PDF]

open access: yes, 2013
The use of multi-temporal laser scanner data is potentially an efficient method for monitoring of vegetation changes, for example, at the alpine treeline.
Nyström, Mattias   +6 more
core   +1 more source

Mapping Lupinus polyphyllus density and distribution along road verges using unmanned aerial vehicle (UAV)–based remote sensing

open access: yesApplications in Plant Sciences, EarlyView.
Abstract Premise Road verges function as refuges for semi‐natural species, but they can also facilitate the spread of non‐native plants such as Lupinus polyphyllus. Unmanned aerial vehicle (UAV)–based remote sensing is a promising tool for mapping these species; however, its application in roadside contexts remains limited.
Elin L. Blomqvist   +3 more
wiley   +1 more source

Application of a Three-Dimensional Radiative Transfer Model to Retrieve the Species Composition of a Mixed Forest Stand from Canopy Reflected Radiation

open access: yesRemote Sensing, 2018
The paper introduces a three-dimensional model to derive the spatial patterns of photosynthetically active radiation (PAR) reflected and absorbed by a non-uniform forest canopy with a multi-species structure, as well as a model algorithm application to ...
Natalia Levashova   +3 more
doaj   +1 more source

Forest Vegetation Texture Segmentation in Remote Sensing Image Based on Visual Attention [PDF]

open access: yesJisuanji gongcheng, 2018
As a typical texture unit of forest vegetation in remote sensing image,the canopy has prominent structural texture features,but the current segmentation methods make use of this texture insufficiently.Aiming at this problem,based on visual attention ...
LIU Xiaodan,YUE Shuang
doaj   +1 more source

Comparison of four different programs for the analysis of hemispherical photographs using parameters of canopy structure and solar radiation transmittance [PDF]

open access: yes, 2013
There have been many studies involving the use of hemispherical photographs to indirectly estimate canopy structures and forest light environments.
Gärtner, Stefanie   +6 more
core  

Sub-Canopy Topography Estimation: Experiments With Multibaseline SAR Data at L-Band [PDF]

open access: yes, 2012
Synthetic aperture radar (SAR) systems in L-band and P-band are characterized by deep penetration capabilities into volumes, enabling new opportunities for the radar remote sensing of forests. In the last years, the interest has been continuously growing
Pardini, Matteo   +3 more
core   +1 more source

Humans and platyrrhines share a pattern of articular variance

open access: yesThe Anatomical Record, EarlyView.
Abstract Previous work has identified a pattern of articular shape variation in modern human limb joints, in which convex joint surfaces exhibit constrained variance relative to their more variable concave conarticulars. This pattern is notable given that joint morphogenesis is influenced by local biomechanical environments, which vary substantially ...
Haley Horbaly, Liam Zachary
wiley   +1 more source

Landscape-scale changes in forest canopy structure across a partially logged tropical peat swamp [PDF]

open access: yesBiogeosciences, 2015
Forest canopy structure is strongly influenced by environmental factors and disturbance, and in turn influences key ecosystem processes including productivity, evapotranspiration and habitat availability.
B. M. M. Wedeux, D. A. Coomes
doaj   +1 more source

On the Estimation of Forest Vertical Structure From Multibaseline Polarimetric SAR Data [PDF]

open access: yes, 2012
Forest characterization and biomass estimation by means of remote sensing systems are nowadays “hot topics” within the remote sensing community, given their importance in the terrestrial carbon budget. In fact, forest vertical structure is a key variable
Pardini, Matteo   +11 more
core   +1 more source

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