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THE FT-ESDR PROVIDES CONSISTENT AND PRECISE (>80% MEAN SPATIAL CLASSIFICATION ACCURACY) DAILY (AM AND PM) CLASSIFICATION OF THE PREDOMINANT FROZEN AND NON-FROZEN STATUS OF THE LANDSCAPE FOR BOTH GLOBAL AND NORTHERN POLAR GRID DOMAINS  WITH RESPECTIVE 25-KM AND 6-KM GRIDDING  AND DETAILED METADATA DESCRIBING PRODUCT QUALITY. THE FT-ESDR HAS BENEFITTED FROM 4 MAJOR REPROCESSING EPOCHS INCORPORATING PRODUCT AND ALGORITHM REFINEMENTS  AND LESSONS LEARNED FROM EARLY ADOPTER AND SCIENCE APPLICATION USERS. PRODUCT SUCCESSES INCLUDE MORE THAN 120 PEER-REVIEWED SCIENTIFIC PUBLICATIONS INVOLVING THE DATA; INCORPORATION OF A FT-ESDR DERIVED CLIMATE INDICATOR FOR THE NATIONAL CLIMATE ASSESSMENT; AND INFORMING DEVELOPMENT OF AN OPERATIONAL FT PRODUCT FOR THE NASA SMAP MISSION. WE PROPOSE TO BUILD ON THIS SUCCESS BY EXTENDING THE DATA RECORD USING CONTINUING TB OBSERVATIONS FROM SSMI AND AMSR2  WHILE DOCUMENTING PRODUCT ACCURACY IN RELATION TO GLOBAL WEATHER STATION OBSERVATIONS  OTHER SATELLITE RECORDS  AND LAND SURFACE MODELS. WE WILL EVALUATE POTENTIAL FT-ESDR ENHANCEMENTS  INCLUDING PRODUCTION OF BOTH NORTHERN AND SOUTHERN POLAR GRID FT RECORDS DERIVED FROM AMSR-E AND AMSR2 THAT PROVIDE UP TO EIGHT-FOLD SPATIAL ENHANCEMENT OVER THE GLOBAL BASELINE. WE WILL INCORPORATE RECENT ALGORITHM ADVANCES USING MACHINE LEARNING  PHYSICS BASED INTERPOLATION  AND DATA FUSION TECHNIQUES FOR DERIVING CONTINUOUS PROBABILISTIC DAILY FT RETRIEVALS WITH ENHANCED RESOLUTION AND PERFORMANCE. WE WILL TEST A SIMILAR APPROACH COMBINING AMSR2 AND SMAP TB RECORDS FOR PROBABILISTIC CLASSIFICATION OF DAILY SURFACE SOIL FT DYNAMICS OVER THE NORTHERN POLAR (=45N) DOMAIN; WE WILL EXPLOIT AND DOCUMENT THE VALUE OF SMAP L-BAND TB OBSERVATIONS FOR DISTINGUISHING SOIL FT RELATIVE TO HIGHER FREQUENCY TB RETRIEVALS FROM AMSR2. THE FT-ESDR SERVES SEVERAL EARTH SCIENCE FOCUS AREAS AND USER COMMUNITIES  INCLUDING WATER&ENERGY CYCLE  CARBON CYCLE&ECOSYSTEMS  AND CLIMATE VARIABILITY&CHANGE. THE CURRENT FT-ESDR (V4) IS PUBLICLY AVAILABLE IN A VARIETY OF FORMATS; RECENT USER METRICS INDICATE MORE THAN 13 000 DISTINCT USERS AND 6.7M PRODUCTS DELIVERED  WHILE THE NUMBER OF USERS  APPLICATIONS AND PUBLICATIONS FROM THESE DATA CONTINUE TO GROW. THE PROPOSED FT-ESDR ACTIVITIES ARE RESPONSIVE TO THE EVOLVING NEEDS OF THE USER COMMUNITY AND WILL INCREASE PRODUCT SCIENCE VALUE AND APPLICATIONS. THE FT VARIABLE WAS SELECTED WITH SOIL MOISTURE AS ONE OF FOUR RECOMMENDED  HIGH PRIORITY OBSERVATIONS/MISSIONS FOR THE NEXT DECADE  TO BE IMPLEMENTED BY NASA AS DIRECTED BY THE NRC DECADAL SURVEY. THE PROPOSED ACTIVITIES WILL BENEFIT THE SMAP MISSION BY SUPPORTING ONGOING REFINEMENTS TO THE L3FT OPERATIONAL PRODUCT AND BY DOCUMENTING THE VALUE OF L-BAND TB RETRIEVALS FOR SOIL FT. 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