We are ready to order a Landsat 7 systematic corrected product. How can we know if it will be a PCD or DEF product?
The definitive or consolidated ephemeris data spans a period from June 29, 1999 through to the present So, products acquired prior to June 29, 1999 are systematically processed with predicted ephemeris (PCD product). The Landsat Handbook entry for Landsat 7 Definitive Ephemeris notes: The Landsat 7 Mission Operations Center receives tracking data on a daily basis that shows the position and velocity of the Landsat 7 spacecraft. This information comes from the three US operated ground-receiving stations and is augmented by similar data from NASA’s Tracking and Data Relay Satellites. The Flight Operations Team processes this information to produce a refined or “definitive” ephemeris that shows the position and velocity of Landsat 7 in one minute intervals. Tracking data are used to compute the actual spacecraft position and velocity for the last 61 hours and to predict these values for the next 72 hours. The predicted ephemeris data are uploaded to the spacecraft daily. On-board software
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- We are ready to order a Landsat 7 systematic corrected product. How can we know if it will be a PCD or DEF product?
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