Welcome to the Earthdata User Forum! Here, subject matter experts from several NASA Distributed Active Archive Centers (DAAC) can discuss general questions, research needs and data applications. Users can query how to access, view and interpret the data.
Yes we are filling in recovered data from the instrument outage in late August, early September 2020. We do not yet have a refined calibration past July 31, so the files are being produced using refined ancillary data but the existing July calibration LUTs. Tommy
by garnthev » Wed Jan 13, 2021 3:18 am America/New_York
Dear Tommy, I know that recent data (December 2020) will be refined in a few months, but we are observing a â€œcatastrophicâ€ decrease of all reflectances (increasing during the last 3 months). Typically, RRS412 has decreased of at least 20% in December 2020 (relative comparison to a climatology or OLCI). Do you have more information about that? Thank You in advance. Philippe
We are aware of the issue. A few years ago we implemented a forward-stream reprocessing scheme for the "refined" data in which we were updating the calibration on an approximate monthly basis. That process hit a snag when the person primarily responsible for generating the calibration took an unexpected leave of absence, so we had another staff member take over the task. Unfortunately, there was a misconfiguration that was not identified until after the primary went on leave. We have only recently identified the source of the misconfiguration and are working to verify that we can replicate the last update before applying it to the intervening 8 months of data. With luck we will be able to generate a viable calibration update and will reprocess the data from ~July 2020 onward. Until we do, however, the data will continue to exhibit this unrealistic drop in the blue band reflectances.