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THE KEY OBJECTIVES OF THE PROPOSED EFFORT ARE TO: 1) USING IN A SEAMLESS FASHION THE DENSE TIME SERIES OF HLS  L-8 AND S-2 IMAGES TO DEVELOP ALGORITHMS FOR ESTIMATING CANOPY CHLOROPHYLL (CHL) CONTENT; AND 2) GENERATE ROBUST WORKFLOWS AND PRODUCE HIGH DENSITY TIME SERIES OF LAND COVER CHL PRODUCTS FOR MAJOR VEGETATION COVER TYPES (CROPS  GRASSLANDS AND FORESTS). EARLIER STUDIES USING INDIVIDUAL LANDSAT SCENES (E.G. LANDSATS TM AND ETM+) WERE NOT ABLE TO DETECT THE EARLY STAGES IN VEGETATION DAMAGE. THOSE STUDIES ONLY PARTIALLY ACCOUNTED FOR VARIATIONS IN ATMOSPHERIC CONDITIONS  TERRAIN ELEVATION AND ILLUMINATION. 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BY ANALYZING THESE COUPLED DENSE TIME SERIES  WE WILL PROVIDE ESSENTIAL INFORMATION ABOUT THE MAJOR BIOPHYSICAL DRIVERS OF VEGETATION HEALTH AND FUNCTION. THIS EFFORT LEVERAGES THE ONGOING INTERNATIONAL COLLABORATIONS BETWEEN USA AND EUROPEAN UNION RESEARCHERS  WHICH WILL PROVIDE EXPERTISE AND SATELLITE IMAGERY AVAILABLE AT THEIR ORGANIZATIONS AS WELL AS FIELD SPECTRAL DATA OBTAINED FROM ESTABLISHED SITES WITH ONGOING FIELD DATA COLLECTIONS. THE PROPOSED WORK DIRECTLY SUPPORTS THE GOALS OF NASA S LCLUC PROGRAM  TO FURTHER \"DEVELOP THE CAPABILITY FOR PERIODIC SATELLITE-BASED INVENTORIES OF LAND COVER  AND MONITORING AND CHARACTERIZING LAND-COVER AND LAND-USE CHANGE.\" THIS EFFORT PROVIDES A SIGNIFICANT STEP FORWARD TOWARDS DEVELOPING AN APPROACH AND TOOLS FOR EVALUATION OF VEGETATION HEALTH AND PHOTOSYNTHETIC FUNCTION AT 30 M RESOLUTION  THAT WILL ENHANCE OUR ABILITY TO IDENTIFY THE DRIVERS AND QUANTIFY THE RATES OF LAND COVER CHANGE FOR CRITICAL VEGETATION TYPES ACROSS THE GLOBE. 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