Centre de documentation
scientifique

Estimating fractional snow cover from MODIS using the normalized difference snow index / V.V. Salomonson in Remote sensing of environment, vol 89 n° 3 (15/02/2004)  

Public [article]  inRemote sensing of environment > vol 89 n° 3 (15/02/2004) . - pp 351 - 360 Titre : Estimating fractional snow cover from MODIS using the normalized difference snow index Type de document : Article/Communication Auteurs : V.V. Salomonson, Auteur ; I. Appel, Auteur Année de publication : 2004 Article en page(s) : pp 351 - 360 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] bande infrarouge [Termes IGN] bande visible [Termes IGN] image Terra-MODIS [Termes IGN] manteau neigeux [Termes IGN] méthode robuste [Termes IGN] neige [Termes IGN] Normalized Difference Snow Index [Termes IGN] réalité de terrain Résumé : (Auteur) Snow-cover information is important for a wide variety of scientific studies, water supply and management applications. The NASA Earth Observing System (EOS) Moderate Resolution Imaging Spectroradiometer (MODIS) provides improved capabilities to observe snow cover orn space and has been successfully using a normalized difference snow index (NDSI), along with threshold tests, to provide global, automated binary maps of snow cover. The NDSI is a spectral band ratio that takes advantage of the spectral differences of snow in short-wave infrared and visible MODIS spectral bands to identify snow versus other features in a scene. This study has evaluated whether there is a "signal" in the NDSI that could be used to estimate the fraction of snow within a 500 in MODIS pixel and thereby enhance the use of the NDSI approach in monitoring snow cover. Using Landsat 30-m observations as "ground truth," the percentage of snow cover was calculated for 500-m cells. Then a regression relationship between 500-m NDSI observations and fractional snow cover was developed over three different snow-covered regions and tested over other areas. The overall results indicate that the relationship between fractional snow cover and NDSI is reasonably robust when applied locally and over large areas like North America. The relationship offers advantages relative to other published fractional snow cover algorithms developed for global-scale use with MODIS. This study indicates that the fraction of snow cover within a MODIS pixel using this approach can be provided with a mean absolute error less than 0.1 over the range from 0.0 to 1.0 in fractional snow cover. Numéro de notice : A2004-019 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2003.10.016 En ligne : https://doi.org/10.1016/j.rse.2003.10.016 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26547 [article]