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Highlights Archive

2021 Highlights

VIIRS-L1 SPA v3.1.0 and IPOPP v4.0 Patch 2 Released - 7/20/2021

The DRL is pleased to announce the release of VIIRS-L1 SPA v3.1.0 and IPOPP v4.0 Patch 2.  The VIIRS-L1 Science Processing Algorithm (SPA) takes VIIRS Science PDS files, Spacecraft packet files for APIDs 0, 8, and 11, and required ancillaries as input and outputs the NASA-format VIIRS Level 1A, Level 1B [for Day/Night Band (DNB), I, and M-bands], Geolocation (for DNB, I, and M-bands), Dual-Gain Intermediate Level 1B, and Onboard Calibrator Data in NetCDF format.  IPOPP Patch 2 updates the L1toSDR Tool within IPOPP v4.0. IPOPP v4.0 Patch 2 must be installed before you install the VIIRS-L1 v3.1.0 SPA.  Once Patch 2 is installed, you may update the VIIRS-L1 SPA from v3.0.0 to v3.1.0 by simply following the instructions in the IPOPP v4.0 User Guide for a seamless installation into your operational environment.
Enhancements to VIIRS-L1 SPA v3.1.0 include: 
  • update to version 3.1.0 of the VIIRS L1 algorithm;
  • updated NetCDF Look-up Tables (LUTs) to version 3.1;
  • updated test data, test scripts, and template files.
The VIIRS-L1 algorithm was provided to the DRL by the multi-discipline VIIRS L1 Team.
The L1toSDR Tool within IPOPP Patch 2 is a format converter tool created by the DRL that takes VIIRS L1 netcdf data products as inputs and produces the hdf5 SDR data products as outputs.
Click here  to access VIIRS-L1 SPA v3.1.0 and IPOPP Patch 2.
Click here to access the VIIRS-L1 SPA v3.1.0 User's Guide.
Click here  to access the DRL-IPOPP_4.0_PATCH_2_README.txt file, which contains instructions to install IPOPP v4.0 Patch 2.
Click here to experience the MyDRL Forums.

MODISL1DB SPA v1.9 Released - 7/14/2021

The DRL is pleased to announce the release of MODISL1DB SPA v1.9. The MODIS Level 1 Direct Broadcast SPA (MODISL1DB_SPA) processes Level 0 MODIS data into Level 1A (MOD01/MYD01) and Geolocation (MOD03/MYD03) products. It also processes Level 1A and Geolocation products into MODIS Level 1B 1km (MOD021KM/MYD021KM), half km (MOD02HKM/MYD02QKM), and quarter km (MOD02QKM/MYD02QKM) data products. To update the MODISL1DB SPA from v1.8 to v1.9, simply follow the instructions in the IPOPP v4.0 User Guide for a seamless installation of this SPA into your operational environment.
This release directly addresses the Terra/MODIS L1A anomaly that began June 26 coincident with a spacecraft remediation of the SSR.
Enhancements to v1.9 include: 
  • Updating the MODIS Terra and Aqua L1A and Geolocation modules to the latest version to mitigate geolocation failures that users have been experiencing while processing recent Terra Direct Broadcast overpasses. These modules were ported from the SeaDAS Data Processing Component (SeaDAS-OCSSW, direct broadcast bundle, tag: V2021.2). 
Please note that the core algorithm within the MODISL1DB SPA v1.9 now requires the following additional prerequisites installed on your host machine:
  • Python 2.7;
  • Python 3.6 or later;
  • Python requests package v2.18.0 or later;
  • A .netrc file containing NASA EarthData Portal credentials installed in your home directory.  Users must be registered with the NASA EarthData Portal (a consequence of latest SeaDAS implementation) to ensure that the algorithm has access to required attitude and ephemeris (navigation previously derived directly from the DB downlink) ancillary files.  Instructions for establishing EarthData login credentials are provided on page 3 of the MODISL1DB SPA v1.9 User Guide.
Note: over the years OBPG migrated from the legacy cross-disciplined goal to purvey a generalized standalone MODIS L1 package, and since has more tightly coupled this capability into their SeaDAS.  As a result, the MODISLDB has increased in size from 620MB to 5.1GB compressed.  This migration into SeaDAS has also changed how the attitude and ephemeris are handled for L1A vs previously deriving directly from the Terra DB downlink. 
The algorithm remediation approach for the Terra/MODIS L1A anomaly was packaged by cooperative effort between the Ocean Biology Processing Group (OBPG) at NASA/GSFC and the DRL Team at NASA/GSFC.
Click here  to access MODISL1DB SPA v1.9.
Click here to access the MODISL1DB SPA v1.9 User's Guide.
Click here to experience the MyDRL Forums.

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