Article (Scientific journals)
Intercomparison of clumping index estimates from POLDER, MODIS, and MISR satellite data over reference sites
Pisek, J.; Govind, A.; Arndt, S. K. et al.
2015In ISPRS Journal of Photogrammetry and Remote Sensing, 101, p. 47-56
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Keywords :
Hotspot; MISR; MODIS; Multi-angle remote sensing; POLDER; Vegetation clumping index; Distribution functions; Image reconstruction; Maps; Reflection; Remote sensing; Satellite imagery; Space optics; Spectrometers; Vegetation; Hot spot; Radiometers
Abstract :
[en] Clumping index is the measure of foliage grouping relative to a random distribution of leaves in space. It is a key structural parameter of plant canopies that influences canopy radiation regimes and controls canopy photosynthesis and other land-atmosphere interactions. The Normalized Difference between Hotspot and Darkspot (NDHD) index has been previously used to retrieve global clumping index maps from POLarization and Directionality of the Earth's Reflectances (POLDER) data at ~6. km resolution and the Bidirectional Reflectance Distribution Function (BRDF) product from Moderate Resolution Imaging Spectroradiometer (MODIS) at 500. m resolution. Most recently the algorithm was also applied with Multi-angle Imaging SpectroRadiometer (MISR) data at 275. m resolution over selected areas. In this study for the first time we characterized and compared the three products over a set of sites representing diverse biomes and different canopy structures. The products were also directly validated with both in-situ vertical profiles and available seasonal trajectories of clumping index over several sites. We demonstrated that the vertical distribution of foliage and especially the effect of understory need to be taken into account while validating foliage clumping products from remote sensing products with values measured in the field. Satellite measurements responded to the structural effects near the top of canopies, while ground measurements may be biased by the lower vegetation layers. Additionally, caution should be taken regarding the misclassification in land cover maps as their errors can propagate into the foliage clumping maps. Our results indicate that MODIS data and MISR data, with 275. m in particular, can provide good quality clumping index estimates at spatial scales pertinent for modeling local carbon and energy fluxes. © 2014 International Society for Photogrammetry and Remote Sensing, Inc. (ISPRS).
Disciplines :
Earth sciences & physical geography
Author, co-author :
Pisek, J.;  Tartu Observatory, 61602 Tõravere, Tartumaa, Estonia
Govind, A.;  INRA, UMR 1391 ISPA, Villenave d'Ornon Bordeaux, France
Arndt, S. K.;  Department of Ecosystem and Forest Science, The University of Melbourne, 500 Yarra Boulevard, Richmond, VIC, Australia
Hocking, D.;  Monash UniversityVIC, Australia
Wardlaw, T. J.;  Forestry Tasmania, Division of Research and Development, GPO Box 207, Hobart Tasmania, Australia
Fang, H.;  LREIS, Institute of Geographic Sciences and Natural Resources Research CAS, Beijing, China
Matteucci, G.;  Consiglio Nazionale delle Ricerche, Institute of Agro-Environmental and Forest Biology, Rome, Italy
Longdoz, Bernard  ;  Université de Liège > Ingénierie des biosystèmes (Biose) > Echanges Ecosystèmes - Atmosphère
Title :
Intercomparison of clumping index estimates from POLDER, MODIS, and MISR satellite data over reference sites
Publication date :
2015
Journal title :
ISPRS Journal of Photogrammetry and Remote Sensing
ISSN :
0924-2716
Publisher :
Elsevier
Volume :
101
Pages :
47-56
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 18 January 2017

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