Centre de documentation
scientifique

Impacts of hydrologic soil properties on drought detection with MODIS thermal data / S. Park in Remote sensing of environment, vol 89 n° 1 (15/01/2004)  

Public [article]  inRemote sensing of environment > vol 89 n° 1 (15/01/2004) . - pp 53 - 62 Titre : Impacts of hydrologic soil properties on drought detection with MODIS thermal data Type de document : Article/Communication Auteurs : S. Park, Auteur ; J.J. Feddema, Auteur Année de publication : 2004 Article en page(s) : pp 53 - 62 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] humidité du sol [Termes IGN] image Terra-MODIS [Termes IGN] image thermique [Termes IGN] Kansas (Etats-Unis ; état) [Termes IGN] Normalized Difference Vegetation Index [Termes IGN] sécheresse [Termes IGN] système d'information géographique [Termes IGN] zone humide Résumé : (Auteur) Remote sensing data from the Moderate Resolution Imaging Spectroradiometer (MODIS), a climatic water budget model, and the STATSGO database were used within a GIS environment to determine the influences of hydrologic soil properties on soil moisture and thermal emission in western-central Kansas for a dry year, 2000. Two important variables, waterholding capacity (WHC) and hydrologic soil group (HSG), were controlled in our water budget experiment to evaluate their impacts on soil moisture content (SMC) changes throughout the period. Results showed that HSG affected drought detection and occurrence very little, but WHC variations explained most local variations of soil moisture content. As a strong indicator of relative soil moisture deficit, the Standardized Thermal Index (STI) patterns were also influenced by WHC. Generally, the earlier the soil moisture content drops below 40%, the earlier the STI reaches a threshold value of 0.2 or higher. Vegetation responses to thermal detection lagged behind the STI by up to 8 weeks, which was computed by comparing the STI and Normalized Difference Vegetation Index (NDVI) deviation from a 10-year mean. The spatial pattern of lagtimes was not apparent, but lagtimes were correlated with a WHC component. Numéro de notice : A2004-009 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2003.10.003 En ligne : https://doi.org/10.1016/j.rse.2003.10.003 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26537 [article]