Mapping grassland leaf area index with airborne hyperspectral imagery: A comparison study of statistical approaches and inversion of radiative transfer models

Statistical and physical models have seldom been compared in studying grasslands. In this paper, both modeling approaches are investigated for mapping leaf area index (LAI) in a Mediterranean grassland (Majella National Park, Italy) using HyMap airborne hyperspectral images. We compared inversion of...

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Veröffentlicht in:	ISPRS journal of photogrammetry and remote sensing Jg. 66; H. 6; S. 894 - 906
Hauptverfasser:	Darvishzadeh, Roshanak, Atzberger, Clement, Skidmore, Andrew, Schlerf, Martin
Format:	Journal Article
Sprache:	Englisch
Veröffentlicht:	Amsterdam Elsevier B.V 01.11.2011 Elsevier
Schlagworte:	Accuracy ancillary information Animal, plant and microbial ecology Applied geophysics band vegetation indexes Biological and medical sciences canopy biophysical variables crop chlorophyll content Earth sciences Earth, ocean, space Exact sciences and technology Fundamental and applied biological sciences. Psychology General aspects. Techniques Grasslands heterogeneous grassland Hyperspectral hyperspectral imagery Internal geophysics Inversions Italy Leaf area index least squares Mapping Mapping LAI Mediterranean grassland Modeling national parks optical-properties Partial least square regression physical models precision agriculture Radiative transfer red edge position reflectance data remote-sensing data Teledetection and vegetation maps Vegetation Vegetation indices Italy Narrows New York Southern Europe United States Europe Mapping LAI Modeling Mediterranean grassland Hyperspectral Vegetation indices Partial least square regression inverse problem Mediterranean vegetation radiative transfer accuracy least-squares Offshore discharge Image North America in situ grasslands physical models regression imagery performances Leaf area index national parks
ISSN:	0924-2716, 1872-8235
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Zusammenfassung:	Statistical and physical models have seldom been compared in studying grasslands. In this paper, both modeling approaches are investigated for mapping leaf area index (LAI) in a Mediterranean grassland (Majella National Park, Italy) using HyMap airborne hyperspectral images. We compared inversion of the PROSAIL radiative transfer model with narrow band vegetation indices (NDVI-like and SAVI2-like) and partial least squares regression (PLS). To assess the performance of the investigated models, the normalized RMSE (nRMSE) and R 2 between in situ measurements of leaf area index and estimated parameter values are reported. The results of the study demonstrate that LAI can be estimated through PROSAIL inversion with accuracies comparable to those of statistical approaches ( R 2 = 0.89, nRMSE = 0.22). The accuracy of the radiative transfer model inversion was further increased by using only a spectral subset of the data ( R 2 = 0.91, nRMSE = 0.18). For the feature selection wavebands not well simulated by PROSAIL were sequentially discarded until all bands fulfilled the imposed accuracy requirements.
Bibliographie:	http://dx.doi.org/10.1016/j.isprsjprs.2011.09.013 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 ObjectType-Article-2 ObjectType-Feature-1
ISSN:	0924-2716 1872-8235
DOI:	10.1016/j.isprsjprs.2011.09.013