SWOT
SWOT Data Tutorials - Get Started with Sample Data!
SWOT Background
The Surface Water and Ocean Topography (SWOT) mission aims to provide valuable data and information about the world’s oceans and its terrestrial surface water such as lakes, rivers, and wetlands. SWOT is being developed jointly by NASA and Centre National D’Etudes Spatiales (CNES), with contributions from the Canadian Space Agency (CSA) and United Kingdom Space Agency (UKSA). The satellite launched on December 16, 2022 and data is expected to be released to the public no earlier than Fall 2023. PO.DAAC is the NASA archive for the SWOT mission, and will be making data available via the NASA Earthdata Cloud (hosted in AWS) with direct download capabilities available. More information can be found on PO.DAAC’s SWOT webpage.
PO.DAAC will host a variety of SWOT data products. Their product description documents can be found in the chart listing each dataset. Before these SWOT products are available, we have SWOT simulated datasets encompassing both oceanography and hydrology sample data. This data is not for analysis, but rather to become comfortable with future SWOT products data formats and access mechanisms.
SWOT Data Resources & Tutorials
Search & Download
Via Graphical User Interface:
- Find/download simulated SWOT data on Earthdata Search
Programmatically: ie. within Python code workflows
- Search and Download via Common Metadata Repository (CMR)
- with unique SWORD river reach ID
- with unique Hydrologic Unit Code (HUC) basin ID
Via Command Line - PO.DAAC subscriber/downloader examples:
Hydrology: These examples will download either the river vector files or the raster files for a location in Texas with multiple passes:
podaac-data-downloader -c SWOT_SIMULATED_NA_CONTINENT_L2_HR_RiverSP_V1 -d ./SWOT_SIMULATED_NA_CONTINENT_L2_HR_RiverSP_V1 -start-date 2022-08-02T00:00:00Z --end-date 2022-08-22T00:00:00Z -b="-97,32.5,-96.5,33"
podaac-data-downloader -c SWOT_SIMULATED_NA_CONTINENT_L2_HR_Raster_V1 -d ./SWOT_SIMULATED_NA_CONTINENT_L2_HR_Raster_V1 --start-date 2022-08-02T00:00:00Z --end-date 2022-08-22T00:00:00Z -b="-97,32.5,-96.5,33"
Oceanography: This example will download modeled sea surface heights:
podaac-data-subscriber -c SWOT_SIMULATED_L2_KARIN_SSH_GLORYS_CALVAL_V1 -d ./data/SWOT_SIMULATED_L2_KARIN_SSH_GLORYS_CALVAL_V1 --start-date 2015-12-30T00:00:00Z
podaac-data-downloader -c SWOT_SIMULATED_L2_NADIR_SSH_ECCO_LLC4320_SCIENCE_V1 -d ./data/SWOT_SIMULATED_L2_NADIR_SSH_ECCO_LLC4320_SCIENCE_V1 --start-date 2011-11-20T00:00:00Z --end-date 2011-11-20T12:00:00Z
For more information, see https://github.com/podaac/data-subscriber
In-cloud Access & Visualization
GIS workflows
Transform
Transform SWOT Hydrology river reach shapefiles into time series - This tutorial is in development
Subset by bounding box - Experimental - coming soon
Additional Resources
2022 SWOT Ocean Cloud Workshop
https://podaac.github.io/2022-SWOT-Ocean-Cloud-Workshop/
The goal of the workshop was to enable the (oceanography) science team to be ready for processing and handling the large volumes of SWOT SSH data in the cloud. Learning objectives focus on how to access the simulated SWOT L2 SSH data from Earthdata Cloud either by downloading or accessing the data on the cloud.