نتایج جستجو برای: vertical vegetation structure

تعداد نتایج: 1685994  

Journal: :Remote Sensing 2017
Junichi Susaki Seiya Kubota

In this paper, we propose a method for using mobile laser-scanning data to estimate the green space ratio (GSR), a landscape index that represents the proportion of green area to the whole-view area. The proposed method first classifies and segments vegetation using voxel-based and shape-based approaches. Vertical planar-surface objects are excluded, and randomly distributed objects are extract...

Journal: :Remote Sensing in Ecology and Conservation 2022

The structural complexity of plant communities contributes to maintaining the ecosystem functioning in fire-prone landscapes and plays a crucial role driving ecological resilience fire. objective this study was evaluate fire off several with reference temporal evolution their vertical diversity (VSD) estimated from data fusion C-band synthetic aperture radar (SAR) backscatter (Sentinel-1) multi...

Journal: :Trends in ecology & evolution 2014
Andrew B Davies Gregory P Asner

The advent and recent advances of Light Detection and Ranging (LiDAR) have enabled accurate measurement of 3D ecosystem structure. Here, we review insights gained through the application of LiDAR to animal ecology studies, revealing the fundamental importance of structure for animals. Structural heterogeneity is most conducive to increased animal richness and abundance, and increased complexity...

2012
Eric M. Wood Anna M. Pidgeon Volker C. Radeloff Nicholas S. Keuler

a r t i c l e i n f o Keywords: Band 4 Foliage-height diversity Horizontal vegetation structure Image texture Infrared air photo Landsat NDVI Wildlife habitat Ecologists commonly collect data on vegetation structure, which is an important attribute for characterizing habitat. However, measuring vegetation structure across large areas is logistically difficult. Our goal was to evaluate the degre...

Risks assessment of forest project implementation in spatial density changes of forest under canopy vegetation using artificial neural network modeling approach   Nowadays, environmental risk assessment has been defined as one of the effective in environmental planning and policy making. Considering the position and structure of vegetation on the forest floor, the main role of forest under ca...

Journal: :Philosophical transactions. Series A, Mathematical, physical, and engineering sciences 2013
Cristina Da Lio Andrea D'Alpaos Marco Marani

The presence and continued existence of tidal morphologies, and in particular of salt marshes, is intimately connected with biological activity, especially with the presence of halophytic vegetation. Here, we review recent contributions to tidal biogeomorphology and identify the presence of multiple competing stable states arising from a two-way feedback between biomass productivity and topogra...

Journal: :JASIST 2010
Asif-ul Haque Paul Ginsparg

We continue investigation of the effect of position in announcements of newly received articles, a single day artifact, with citations received over the course of ensuing years. Earlier work [1, 2] focused on the " visibility " effect for positions near the beginnings of announcements, and on the " self-promotion " effect associated to authors intentionally aiming for these positions, with both...

2014
Changjun Zhu Wenlong Hao Xiangping Chang

In order to experimentally investigate the effects of rigid vegetation on the characteristics of flow, the vegetations were modeled by rigid cylindrical rod. Flow field is measured under the conditions of submerged rigid rod in flume with single layer and double layer vegetations. Experiments were performed for various spacings of the rigid rods. The vegetation models were aligned with the appr...

2012
Felix Morsdorf Anders Mårell Eric Rigolot Britta Allgöwer

Airborne laser scanning (ALS) based height and intensity information was exploited for the vertical stratification of vegetation layers in a multilayered Mediterranean ecosystem. A new methodology for the separation of different strata was implemented using supervised classification of a two-dimensional feature space spanned by ALS return height (terrain corrected) and discrete return intensity...

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