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.
by liamgumley » Wed Jan 08, 2020 2:02 pm America/New_York
Does SeaDAS 7.5 have the ability to create VIIRS L1A from L0 PDS files? Specifically, the VIIRS L0 PDS files one can create from direct broadcast data? If so, which binary is used and what is the calling syntax?
No, it doesn't. We haven't distributed the l1agen_viirs binary with SeaDAS. I suppose we *could*, but to date there has been zero interest in it. In the 7 years since we added support for VIIRS, you're the first to ask about L0 processing...
The VIIRS L1A products we distribute are available as soon as we receive the L0 data. The L0 data are in orbit-based (nominally 90 minutes) which are replaced by 2-hour PDS files. The orbit based files are available with a sub-3hour latency and the 2-hour replay (and the official archive product) with a nominal 7 hour latency from data collection. We do not distribute the PDS files, but even if we did, they would be available at the same time as the 6 minute L1A files they produce. So, there is no need for the l1agen_viirs code to be run by users, just grab the L1A files that we make available.