LAP Lambert Academic Publishing 9783659410734-产品快照
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LAP Lambert Academic Publishing 9783659410734
Drought Detection & Quantification - Hardcover, Softcover - Language: eng
LAP Lambert Academic Publishing
Artikel-Nr.: 858Q-9783659410734 Hersteller: LAP Lambert Academic Publishing Herst.-Nr.: 9783659410734 EAN/GTIN: 9783659410734 Drought Detection & Quantification Using Field-Based Spectral Measurements of Vegetation in Semi-Arid Regions Drought is a serious climatic condition that affects nearly all climatic zones worldwide, with semi-arid regions being especially susceptible to drought conditions because of their low annual precipitation and sensitivity to climate changes. Drought indices such as the Standardized Precipitation Index (SPI) have been developed for quantifying drought conditions. Usually, calculation of drought indices requires a long record of climatic data. Remote sensing of semi-arid vegetation can provide vegetation indices which can be used to link drought conditions when correlated with various drought indices. Spectral reflectance measurements of creosote and black gramma grass were taken between January and November 2003 in the Sevilleta National Wildlife Refuge of New Mexico and various vegetation indices were derived. Each vegetation index was correlated with the SPI of various weekly timescales at varying time-lag intervals calculated from 1999. The results show a strong linear correlation between the vegetation indices NDVI, Greenness Index, ARVI and drought index SPI at various SPI measurements with various lag times Weitere Informationen: Autor: Marshall, Geoffrey Verlag: LAP Lambert Academic Publishing Sprache: eng
Autor: Marshall, Geoffrey Verlag: LAP Lambert Academic Publishing Sprache: eng
Startseite Fachbücher Geowissenschaftsbücher
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