I looked at a time series of NDVI a while back and saw variation from day-to-day. There has been some great work on cross-calibration (called CESTEM-BASED in https://www.sciencedirect.com/science/article/abs/pii/S0034425718300786) but it’s quite complex to implement.
This article seems to indicate some additional calibration is being performed by Planet https://support.planet.com/hc/en-us/articles/360012629353-Absolute-Radiometric-Calibration-of-Planet-Dove-Satellites-Flocks-2p-2e . Is Does this remove some of the sensor-sensor variation the CESTEM was seeking to resolve? The document mentions March 2017 - so I’m guessing users who need a time-series of vegetation indices still need to apply some form of post-calibration?
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