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Titolo:
A MODIFIED SOIL ADJUSTED VEGETATION INDEX
Autore:
QI J; CHEHBOUNI A; HUETE AR; KERR YH; SOROOSHIAN S;
Indirizzi:
USDA ARS,SW WATERSHED RES CTR,2000 E ALLEN RD TUCSON AZ 85719 LAB ETUD & RECH TELEDETECT SPATIALE TOULOUSE FRANCE UNIV ARIZONA,DEPT SOIL & WATER SCI TUCSON AZ 85721 UNIV ARIZONA,DEPT HYDROL & WATER RESOURCES TUCSON AZ 85721
Titolo Testata:
Remote sensing of environment
fascicolo: 2, volume: 48, anno: 1994,
pagine: 119 - 126
SICI:
0034-4257(1994)48:2<119:AMSAVI>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
12
Recensione:
Indirizzi per estratti:
Citazione:
J. Qi et al., "A MODIFIED SOIL ADJUSTED VEGETATION INDEX", Remote sensing of environment, 48(2), 1994, pp. 119-126

Abstract

There is currently a great deal of interest in the quantitative characterization of temporal and spatial vegetation patterns with remotely sensed data for the study of earth system science and global change. Spectral models and indices are being developed to improve vegetation sensitivity by accounting for atmosphere and soil effects. The soil-adjusted vegetation index (SAVI) was developed to minimize soil influences on canopy spectra by incorporating a soil adjustment factor L into the denominator of the normalized difference vegetation index (NDVI) equation. For optimal adjustment of the soil effect, however, the L factor should vary inversely with the amount of vegetation present. A modified SAVI (MSAVI) that replaces the constant L in the SAVI equation with a variable L function is presented in this article. The L function may be derived by induction or by using the product of the NDVI and weighted difference vegetation index (WDVI). Results based on ground andaircraft-measured cotton canopies are presented. The MSAVI is shown to increase the dynamic range of the vegetation signal while further minimizing the soil background influences, resulting in greater vegetation sensitivity as defined by a ''vegetation signal'' to ''soil noise''ratio.

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Documento generato il 30/11/20 alle ore 00:41:13