Filters








181 Hits in 9.2 sec

A Monte Carlo radiative transfer model of satellite waveform LiDAR

P. R. J. North, J. A. B. Rosette, J. C. Suárez, S. O. Los
2010 International Journal of Remote Sensing  
The model is developed from the FLIGHT radiative transfer model (North, 1996) , based on Monte Carlo simulation of photon transport.  ...  We present a method and initial results for a model of the interaction of waveform lidar with a three-dimensional canopy representation.  ...  Discussion We have presented a Monte Carlo radiative transfer model of waveform lidar for three-dimensional vegetation canopies, within the framework of the FLIGHT model (North 1996) .  ... 
doi:10.1080/01431160903380664 fatcat:n7rdtlm4rvh3jg7cer2tyxeuha

Stochastic transport theory for investigating the three-dimensional canopy structure from space measurements

D HUANG, Y KNYAZIKHIN, W WANG, D DEERING, P STENBERG, N SHABANOV, B TAN, R MYNENI
2008 Remote Sensing of Environment  
The stochastic radiative transfer equations naturally admit this measure and thus provide a powerful means to investigate the three-dimensional canopy structure from space.  ...  The theory of radiative transfer in stochastic media provides the most logical linkage between satellite observations and the three-dimensional canopy structure through a closed system of simple equations  ...  Introduction The three-dimensional (3D) structure of vegetation canopies determines the spatial distribution of intercepted solar radiation which drives various physiological and physical processes integral  ... 
doi:10.1016/j.rse.2006.05.026 fatcat:aums4fstvzdere5mgrntxjxnju

Optical remote sensing of vegetation: Modeling, caveats, and algorithms

R.B. Myneni, S. Maggion, J. Iaquinta, J.L. Privette, N. Gobron, B. Pinty, D.S. Kimes, M.M. Verstraete, D.L. Williams
1995 Remote Sensing of Environment  
The state-of-the-art on radiative transfer modeling in vegetation canopies and the application of such models to the interpretation and analysis of remotely sensed optical data is summarized.  ...  Modeling of top-of-the-atmosphere and top-of-the-canopy radiance field is developed as boundary value problems in radiative transfer.  ...  The hybrid three-dimensional model developed by Welles and Norman (1991) combines the geometrical objects and radiative transfer approaches to simulate the reflectance of heterogeneous vegetation canopies  ... 
doi:10.1016/0034-4257(94)00073-v fatcat:qi7ncax7m5dwnb6geagehqotwm

Forest summer albedo is sensitive to species and thinning: how should we account for this in Earth system models?

J. Otto, D. Berveiller, F.-M. Bréon, N. Delpierre, G. Geppert, A. Granier, W. Jans, A. Knohl, A. Kuusk, B. Longdoz, E. Moors, M. Mund (+3 others)
2014 Biogeosciences  
A stand-level forest gap model is combined with a canopy radiation transfer model and satellite-derived model parameters to quantify the effects of forest thinning on summertime canopy albedo.  ...  In addition, Earth system models need to account for forest management in such a way that structural changes in the canopy are described by changes in leaf area index and crown volume (maximum change of  ...  We would like to thank Miina Rautiainen for useful comments on an earlier draft of the manuscript. J. Otto and S.  ... 
doi:10.5194/bg-11-2411-2014 fatcat:ujwvx6wjyffjxfcgqiemzm43r4

PROSPECT+SAIL models: A review of use for vegetation characterization

Stéphane Jacquemoud, Wout Verhoef, Frédéric Baret, Cédric Bacour, Pablo J. Zarco-Tejada, Gregory P. Asner, Christophe François, Susan L. Ustin
2009 Remote Sensing of Environment  
The combined PROSPECT leaf optical properties model and SAIL canopy bidirectional reflectance model, also referred to as PROSAIL, has been used for about sixteen years to study plant canopy spectral and  ...  This paper provides an extensive review of the PROSAIL developments in the context of canopy biophysics and radiative transfer modeling.  ...  Acknowledgments People interested by the models can download them at http:// teledetection.ipgp.jussieu.fr/prosail/ or send a request to the authors.  ... 
doi:10.1016/j.rse.2008.01.026 fatcat:je3boxgbdnhbhpt6lcf3wdltr4

The spectral signature of coniferous forests: the role of stand structure and leaf area index

Miina Rautiainen
2005 Dissertationes Forestales  
First of all, I wish to thank the best possible supervisors -Pauline Stenberg and Tiit Nilson -for all their warm encouragement, kind help and wise words. It is an honor to know you, Pola and Tiit.  ...  ACKNOWLEDGEMENTS There are many people to thank.  ...  Nevertheless, these models often describe the three dimensional structure of the stands in a more realistic way.  ... 
doi:10.14214/df.6 fatcat:w35rlwe7afduxbfr4qx2ygvao4

The spectral/temporal manifestation of forest succession in optical imagery

Conghe Song, Curtis E Woodcock, Xiaowen Li
2002 Remote Sensing of Environment  
This study integrates the geometric-optical and radiative transfer (GORT) canopy reflectance model with the ZELIG forest ecosystem dynamics model to study the manifestation of forest succession in optical  ...  The simulated effects of topography on successional trajectories exist in the Landsat data.  ...  Cohen for his valuable comments on the manuscript and Jim Mayo at the Blue River District Ranger Office of US Forest Service for making stand history data available to this research.  ... 
doi:10.1016/s0034-4257(02)00046-9 fatcat:o4fhnwainnhr7m2nzhjb43ye3y

Geometric-Optical Bidirectional Reflectance Modeling of a Conifer Forest Canopy

Xiaowen Li, Alan Strahler
1986 IEEE Transactions on Geoscience and Remote Sensing  
A geometric-optical forest canopy model that treats conifers as cones casting shadows on a contrasting background explains the major anisotropies in bidirectional reflectance measurements of a conifer  ...  The model uses parallelray geometry to describe the illumination and viewing of conifers as three-dimensional cones. Cones are randomly placed and overlap freely.  ...  We are indebted to him for many helpful comments and suggestions that greatly improved the quality of this paper.  ... 
doi:10.1109/tgrs.1986.289706 fatcat:6fbvslghavhz5fzaxb66ypkhdm

The Potential of Forest Biomass Inversion Based on Vegetation Indices Using Multi-Angle CHRIS/PROBA Data

Qiang Wang, Yong Pang, Zengyuan Li, Guoqing Sun, Erxue Chen, Wenge Ni-Meister
2016 Remote Sensing  
We used the Discrete Anisotropic Radiative Transfer (DART) model and the Zelig model to simulate the forest canopy Bidirectional Reflectance Distribution Factor (BRDF) in order to build a look-up table  ...  In this study, the angle VIs were designed using all of the angles and bands of a look-up table (LUT), simulated by the Discrete Anisotropic Radiative Transfer (DART) model, to estimate forest biomass,  ...  Firstly, the forest growth model, ZELIG, is used to generate forest scenes, which are used to drive the Discrete Anisotropic Radiative Transfer (DART) model, as described in References [30, 31] .  ... 
doi:10.3390/rs8110891 fatcat:m3b276s6rndlfmk75kz2a3nila

Influence of 3D Spruce Tree Representation on Accuracy of Airborne and Satellite Forest Reflectance Simulated in DART

Růžena Janoutová, Lucie Homolová, Zbyněk Malenovský, Jan Hanuš, Nicolas Lauret, Jean-Philippe Gastellu-Etchegorry
2019 Forests  
and (ii) to use the reconstructed 3D spruce representations for evaluation of the effects of canopy structure on forest reflectance simulated in the Discrete Anisotropic Radiative Transfer (DART) model  ...  For the first time, we demonstrated the capability of the DART model to simulate reflectance of complex coniferous forest scenes up to the level of a single needle (scenario D).  ...  skeleton and natural distribution of needle foliage) and (ii) evaluate the effect of canopy structure on forest reflectance as simulated in a radiative transfer model.  ... 
doi:10.3390/f10030292 fatcat:wlxyvyo4evhpzlftnna3skgztm

A clumped-foliage canopy radiative transfer model for a global dynamic terrestrial ecosystem model. I: Theory

Wenge Ni-Meister, Wenze Yang, Nancy Y. Kiang
2010 Agricultural and Forest Meteorology  
This scheme has the same computational cost as the current typical scheme being used in GCMs, but promises to provide better canopy radiative transfer estimates for DGVMs, particularly those that model  ...  The canopy radiative transfer scheme accounts for both vertical and horizontal heterogeneity of plant canopies by combining the simple two-stream scheme with a well-described actual vertical foliage profile  ...  Introduction Calculation of canopy radiative transfer for simulation of coupled biosphere-atmosphere interactions, such as in atmospheric general circulation models (AGCMs) must be able to provide: (1)  ... 
doi:10.1016/j.agrformet.2010.02.009 fatcat:g5bhvsokirde5d5h7liko3j4zu

Assessing the potential of sun-induced fluorescence and the canopy scattering coefficient to track large-scale vegetation dynamics in Amazon forests

Philipp Köhler, Luis Guanter, Hideki Kobayashi, Sophia Walther, Wei Yang
2018 Remote Sensing of Environment  
Two new remote sensing vegetation parameters derived from spaceborne spectrometers and simulated with a three dimensional radiative transfer model have been evaluated in terms of their prospects and drawbacks  ...  forests.  ...  With thanks to Alexa Oliphant and Troy S. Magney for their thoughtful linguistic revision of the manuscript.  ... 
doi:10.1016/j.rse.2017.09.025 fatcat:yavoyjtbunatrbntavnetbtjhe

Cutting out the middleman: calibrating and validating a dynamic vegetation model (ED2-PROSPECT5) using remotely sensed surface reflectance

Alexey N. Shiklomanov, Michael C. Dietze, Istem Fer, Toni Viskari, Shawn P. Serbin
2021 Geoscientific Model Development  
Comparing the ED2 radiative transfer model with another two-stream soil–leaf–canopy radiative transfer model commonly used in remote sensing studies (PRO4SAIL) illustrated structural errors in the ED2  ...  Here, we created the EDR model by coupling the two-stream representation of canopy radiative transfer in the Ecosystem Demography model version 2 (ED2) with a leaf radiative transfer model (PROSPECT-5)  ...  Serbin was also supported by the United States Department of Energy contract no. DE-SC0012704 to Brookhaven National Laboratory.  ... 
doi:10.5194/gmd-14-2603-2021 fatcat:3frxdgzihrghlpa7cviyyb7474

Evaluation of the PROSAIL Model Capabilities for Future Hyperspectral Model Environments: A Review Study

Katja Berger, Clement Atzberger, Martin Danner, Guido D'Urso, Wolfram Mauser, Francesco Vuolo, Tobias Hank
2018 Remote Sensing  
The PROSAIL Model Overview PROSAIL combines the leaf optical properties model PROSPECT with the turbid medium canopy radiative transfer model SAIL.  ...  The PROSAIL Model Overview PROSAIL combines the leaf optical properties model PROSPECT with the turbid medium canopy radiative transfer model SAIL.  ...  The founding sponsors had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, and in the decision to publish the results.  ... 
doi:10.3390/rs10010085 fatcat:6pepgyohvnhoredguwdyvn6xtq

Analyzing the effect of structural variability and canopy gaps on forest BRDF using a geometric-optical model

F.F. Gerard, P.R.J. North
1997 Remote Sensing of Environment  
The model represents the forest canopy as a group of discrete tree croums and uses a deterministic ray tracing procedure to generate a two-dimensional .scenc of shadow pattern components.  ...  The rru~lul is designed to te.st the eflect of canopy structure parameters on the bidirectional rejectance (If forests and can easily bo adapted to accommodate diflerent croum shape.s, crown sizes, stem  ...  The authors wish to thank Steve Plummer for giving advice and support as well as Barry Wyatt, Andrew M&n@on, and Fer- guu" Gallagher.  ... 
doi:10.1016/s0034-4257(97)00070-9 fatcat:rwyx2yt54zga7ljiq2eawjkx2e
« Previous Showing results 1 — 15 out of 181 results