Lagacherie P. auteur aut IRD Gomez Cécile auteur aut IRD Bailly J.S. auteur aut IRD Baret F. auteur aut IRD Coulouma G. auteur aut IRD text bookSection eng text/pdf born digital access Hyperspectral imagery is considered as a promising source of data to overcome the lack of soil information that often hamper digital soil mapping. We have tested it in the vineyard plain of Languedoc (southern France) using an 5×5 m resolution HYMAP image and 52 calibration-validation points. Satisfactory predictions of clay content and calcium carbonate (CaCO3) content were first obtained from HYMAP spectra over bare soils, partial least-squares regression performing better than continuum removal technique. These predictions were however less precise than using laboratory spectra. An examination of the possible factors that could explain this decrease showed that calibration uncertainties of the HYMAP sensor and of atmospheric effects were largely predominant. Secondly, since the HYMAP image was largely covered by vegetation with few pure bare soil pixels, an interpolation-aggregation procedure was proposed to obtain a 100×100 m digital soil map of the whole study area from a set of scattered bare soil fields with hyperspectral soil characterization. Interpolation was performed by a conditional simulation algorithm to estimate the within pixel soil pattern parameters. Validation results showed that satisfactory estimates of local means can be obtained whereas the variations of local variances were only partly represented. specialized SOL CARTOGRAPHIE CARTE PEDOLOGIQUE TELEDETECTION IMAGE SATELLITE SPECTROSCOPIE SPECTROMETRIE INFRAROUGE ANALYSE SPECTRALE REFLECTANCE ARGILE CARBONATE CALCIUM FRANCE LANGUEDOC ROUSSILLON 126TELAPP03 068SPASOL Boettinger J.L. ed. edt IRD Howell D.W. ed. edt IRD Moore A.C. ed. edt IRD Hartemink A.E. ed. edt IRD Kienast-Brown S. ed. edt IRD 2 93-102 Dordrecht Springer 2010 2 https://www.documentation.ird.fr/hor/fdi:010054778 10.1007/978-90-481-8863-5_8 978-90-481-8862-8 [F B010054778] https://www.documentation.ird.fr/hor/fdi:010054778 https://www.documentation.ird.fr/intranet/publi/2024-07/010054778.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2012-02-28 2024-07-04 fdi:010054778 fre