EARTH'S VEGETATED ECOSYSTEMS ARE A KEY FACTOR FOR SUSTAINING LIFE ON EARTH. THEY PROVIDE FOOD FIBER AND HABITAT AND OPERATE AS KEY COMPONENTS OF THE CARBON WATER AND ENERGY CYCLES. THEY ALSO OFFER THE BENEFIT OF REMOVING CO2 FROM THE ATMOSPHERE AND CONVERTING IT TO STORED BIOMASS (AND OXYGEN) BUT ARE SUSCEPTIBLE TO CHANGING CLIMATE. NASA HAS STRONG INTEREST IN DETECTING AND PREDICTING CHANGES TO EARTH'S ECOSYSTEMS AS DESCRIBED IN THEIR STRATEGIC AND SCIENCE PLANS. VEGETATION PRODUCTIVITY IS RELATED TO STRUCTURE AS IT IS A KEY FACTOR IN DETERMINING THE LIGHT ENVIRONMENT WITHIN THE CANOPY. PRODUCTIVITY CAN BE ESTIMATED BY LIGHT USE EFFICIENCY (LUE) MODELS THAT TAKE INTO ACCOUNT VEGETATION STRESS FROM LACK OF SOIL MOISTURE DISEASE AND INSECTS. VEGETATION FUNCTIONS IN RESPONSE TO ITS ENVIRONMENT THAT VARIES THROUGH THE DAY. SHADOWS CAUSED BY 3D STRUCTURE AND SOLAR ANGLE HOWEVER LIMIT THE ACCURACY OF THIS APPROACH FROM SPACE AND CURRENT METHODS AND CONCEPTS REQUIRE SENSORS WITH MULTI--ANGLE VIEWS TO INFER SHADOW FRACTION. THIS IMPORTANT DIAGNOSTIC IS LACKING IN CURRENTLY FLYING AND PROPOSED SYSTEMS AND REQUIRES A CONSTELLATION OF SATELLITES TO OBTAIN DATA AT MULTIPLE TIMES DURING A DAY. THE INSTRUMENT CONCEPT PROPOSED HERE IS DESIGNED TO PROVIDE DIURNAL SPECTRAL RADIANCE MEASUREMENTS NEEDED FOR VEGETATION FUNCTION AND HIGH DEFINITION VEGETATION STRUCTURE (FOR INFERRING SCENE SHADOWS). THE SCIENTIFIC MEASUREMENTS NEEDED ARE 30M RESOLUTION VISIBLE NEAR INFRARED AND SHORTWAVE INFRARED (VSWIR; 450NM 1650NM) CALIBRATED RADIANCES FOR VEGETATION FUNCTION AND HIGH DEFINITION ~1 METER RESOLUTION PANCHROMATIC STEREO IMAGES FOR VEGETATION STRUCTURE. THESE MEASUREMENTS ARE TO BE ACQUIRED WITH A DIURNAL CONSTELLATION AT THREE TIMES PER DAY BEST SUITED TO CAPTURE VEGETATION FUNCTIONAL RESPONSE TO ENVIRONMENTAL CONDITIONS. CURRENT AND PLANNED MISSIONS DO NOT PROVIDE THIS CAPABILITY AT AN AFFORDABLE COST. A ROBUST AND COST EFFECTIVE APPROACH IS TO DEPLOY SIX MINISATS (100--180KG) ON AN EELV SECONDARY PAYLOAD (ESPA) RING OR AS AN INDEPENDENT LAUNCH ON SPACEX OR A PEGASUS. THIS APPROACH REQUIRES THAT THE INSTRUMENT BE MINIATURIZED YET FULLY CAPABLE OF DELIVERING THE VSWIR SPECTRAL AND 30 M SPATIAL MEASUREMENTS.