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Centre d'études spatiales de la biosphère |  |
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Centre d'études spatiales de la biosphère | |
| HAL : ird-00403130, version 1 |
| DOI : 10.1016/j.rse.2009.06.012 |
| Code IRD Horizon : fdi:010048191 |
| Fiche détaillée |  Récupérer au format |
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| Remote Sensing of Environment (2009) RSE-07453; No of Pages 10 |
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| A sequential model for disaggregating near-surface soil moisture observations using multi-resolution thermal sensors |
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O. Merlin 1A. Al Bitar 1 |
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| (2009) |
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| A sequential model is developed to disaggregate microwave-derived soil moisture from 40 km to 4 km resolution using MODIS (Moderate Imaging Spectroradiometer) data and subsequently from 4 km to 500 m resolution using ASTER (Advanced Scanning Thermal Emission and Reflection Radiometer) data. The 1 km resolution airborne data collected during the three-week National Airborne Field Experiment 2006 (NAFE'06) are used to simulate the 40 km pixels, and a thermal-based disaggregation algorithm is applied using 1 km resolution MODIS and 100 m resolution ASTER data. The downscaled soil moisture data are subsequently evaluated using a combination of airborne and in situ soil moisture measurements. A key step in the procedure is to identify an optimal downscaling resolution in terms of disaggregation accuracy and sub-pixel soil moisture variability. Very consistent optimal downscaling resolutions are obtained for MODIS aboard Terra, MODIS aboard Aqua and ASTER, which are 4 to 5 times the thermal sensor resolution. The root mean square error between the 500 m resolution sequentially disaggregated and ground-measured soil moisture is 0.^062 vol./vol. with a bias of −0.045^ vol./vol. and values ranging from 0.08 to 0.40^ vol./vol. |
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| 1 : | Centre d'études spatiales de la biosphère (CESBIO) |
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CNRS : UMR5126 – Institut de recherche pour le développement [IRD] – CNES – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III |
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| 2 : | Department of Civil and Environmental Engineering |
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University of Melbourne |
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| domaine | : | Sciences du Vivant/Ecologie, Environnement/Ecosystèmes |
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| Disaggregation – Soil moisture – Fractal – Scaling – Multi-sensor – NAFE – SMOS – MODIS – ASTER |
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| Liste des fichiers attachés à ce document : | |||||
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| ird-00403130, version 1 | |
| http://hal.ird.fr/ird-00403130 | |
| oai:hal.ird.fr:ird-00403130 | |
| Contributeur : Dominique Bruel | |
| Soumis le : Jeudi 9 Juillet 2009, 14:03:25 | |
| Dernière modification le : Jeudi 9 Juillet 2009, 14:15:33 | |
