Title: Geostatistical regularization of inverse models for the retrieval of vegetation biophysical variables
Authors: ATZBERGER Clement
Citation: Remote Sensing for Environmental Monitoring, GIS Applications, and Geology IX (Proceedings Volume), ISBN 9780819477835 vol. 7478
Publisher: SPIE
Publication Year: 2009
JRC N°: JRC54078
URI: http://spie.org/x648.html?product_id=830009
DOI: 10.1117/12.830009
Type: Articles in periodicals and books
Abstract: The robust and accurate retrieval of vegetation biophysical variables using radiative transfer models (RTM) is seriously hampered by the ill-posedness of the inverse problem. With this research we further develop our previously published (object-based) inversion approach [Atzberger (2004)]. The object-based RTM inversion takes advantage of the geostatistical fact that the biophysical characteristics of nearby pixel are generally more similar than those at a larger distance. A two-step inversion based on PROSPECT+SAIL generated look-up-tables is presented that can be easily implemented and adapted to other radiative transfer models. The approach takes into account the spectral signatures of neighboring pixel and optimizes a common value of the average leaf angle (ALA) for all pixel of a given image object, such as an agricultural field. Using a large set of leaf area index (LAI) measurements (n = 58) acquired over six different crops of the Barrax test site (Spain), we demonstrate that the proposed geostatistical regularization yields in most cases more accurate and spatially consistent results compared to the traditional (pixel-based) inversion. Pros and cons of the approach are discussed and possible future extensions presented.
JRC Directorate:Space, Security and Migration

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