Tag: NDVI

METER Apogee Instruments NDVI and PRI sensors Instruction Manual METER Apogee Instruments NDVI and PRI sensor 1. INTRODUCTION Apogee Instruments NDVI and PRI sensors are two-band radiometers measuring radiation in discrete wavebands from both incoming (S2-411, S2-421) and reflected (S2- 412, S2-422) sources. Reflectance derived from paired upward and downward facing sensors can be used…