May 21, 2025
Dear SWOT User Community,
We are pleased to inform you that the transition to KaRIn Version D products is complete.
KaRIn Version D products distributed by PODAAC are distributed in the following collections:
- Level 1B Low-Rate Interferogram Data Product, DOI: 10.5067/SWOT-INTF-D
- Level 2 KaRIn Low Rate Sea Surface Height Data Product, DOI: 10.5067/SWOT-SSH-D
- Level 1B High-Rate Single-look Complex Data Product, DOI: 10.5067/SWOT-SLC-D
- Level 2 Water Mask Pixel Cloud Data Product, DOI: 10.5067/SWOT-PIXC-D
- Level 2 Water Mask Pixel Cloud Auxiliary Data Product, DOI: 10.5067/SWOT-PIXCVEC-D
- Level 2 River Single-Pass Vector Data Product, DOI: 10.5067/SWOT-RIVERSP-D
- Level 2 River Cycle-Averaged Data Product, DOI: 10.5067/SWOT-RIVERAVG-D
- Level 2 Lake Single-Pass Vector Data Product, DOI: 10.5067/SWOT-LAKESP-D
- Level 2 Lake Cycle-Averaged Data Product, DOI: 10.5067/SWOT-LAKEAVG-D
- Level 2 Water Mask Raster Image Data Product, DOI: 10.5067/SWOT-RASTER-D
Version D products are accessible through NASA Earthdata Search client and easily downloadable from the command line with the podaac-data-subscriber. Additional tips for searching KaRIn HR data products can be found in the PO.DAAC Cookbook - SWOT Chapter. KaRIn Version C products continue to be available at the PO.DAAC.
To emphasize information from the KaRIn Version D release note:
- The location of products at PODAAC has changed to data collections ending in “D”, e.g. L2_LR_SSH_D, L2_HR_PIXC_D, L2_HR_RiverSP_D, L2_HR_LakeSP_D, L2_HR_Raster_D, etc.
- Please always use product granules with the highest product counter.
- This should always apply, but is especially important for products with measurements spanning the 3-5 days following May 6, 2025.
- During the transition to Version D, some known anomalous products with measurements spanning the 3-5 days following May 6, 2025 were generated. The affected data were reprocessed to generate nominal products with higher product counters. PODAAC has made best efforts to remove the anomalous products.
- The file name of each product granule contains an identifier (CRID) that enables a user to distinguish between Version C and D products.
- The last Version C products will be for measurements on ~May 5, 2025.
- The first Version D products will be for measurements on ~May 6, 2025.
Version D products will be generated for all measurements spanning the start of the calibration phase onward, and consist of:
- Reprocessed products for observations from the start of the calibration phase (March 30, 2023) through cycle 32 (~May 19, 2025). The reprocessing of SWOT KaRIn Version D products has started and is expected to complete in early 2026.
- Forward-processed products for measurements from May 6, 2025 onward.
Please also note that the SWOT Nadir Altimeter and Radiometer products have also transitioned to new versions. The new version of nadir altimeter products are identified as Version “S”. However, at PO.DAAC they are provided in Version “D” data collections to correspond with the coincident release of SWOT Version “D KaRIn products. Reprocessed nadir altimeter and radiometer products are expected to be available by the end of June 2025.
These new products are available in the following data collections:
Presentations and recordings from the recent webinar introducing KaRIn Version D, along with other related resources, are available in the "Datasets Information" section on the PO.DAAC SWOT Mission page.
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User Services Office
NASA JPL Physical Oceanography DAAC
E-mail: podaac@podaac.jpl.nasa.gov
URL: https://podaac.jpl.nasa.gov
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