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Title

DERIVATION OF SURFACE AND SUBSURFACE SOIL MOISTURE FROM MODIS NDVI PRODUCT USING MULTIVARIABLE REGRESSION APPROACH (CASE STUDY: HEZARJOLFA FARMS, QAZVIN)

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Abstract

 THE SOIL MOISTURE AFFECTS THE BIOLOGICAL PROCESSES ON THE EARTH'S SURFACE AND ATMOSPHERE THROUGH AN IMMEDIATE EFFECT ON THE ENERGY LEVELS AND MOISTURE FLUX. IN THIS STUDY TO DERIVE THE SOIL MOISTURE IN THE UPPER AND LOWER OF SOIL PROFILE IN THE ROOT ZONE, A MULTIVARIABLE REGRESSION APPROACH WAS IMPLEMENTED ON NDVI MAPS DERIVED FROM MODIS SATELLITE IMAGE. THE RESULTS WERE VERY PROMISING AND INDICATED A GOOD CORRELATION BETWEEN NDVI VALUES AND SOIL MOISTURE AT DIFFERENT DEPTHS WITH 5 TO 10 DAY-DELAY. THE BEST CORRELATION (R2= 0.73) WAS ACHIEVED WITH 5-DAY- DELAY IN MAIZE FIELD UNDER CENTER PIVOT IRRIGATION SYSTEM. ALSO ON THE SAME FARM, 10-DAY- DELAY NDVI SHOWED A CORRELATION COEFFICIENT OF 0.68 WITH SOIL MOISTURE AT A DEPTH 30-45 CM IN AN ALFALFA FIELD UNDER CLASSIC IRRIGATION SYSTEM. SOIL MOISTURE AT UPPER PARTS (15-30 CM) HAD A GOOD CORRELATION (R2= 0.68) WITH NDVI WITH AND WITHOUT DELAY. IN GENERAL, NDVI AS A VEGETATION INDEX IS A GOOD INDICATOR OF VEGETATION HEALTH AND SOIL MOISTURE CONSIDERING THE DELAY FACTOR.

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