Imaging · collection · 2020
JPL SMAP Level 2B Near Real-time CAP Sea Surface Salinity V5.0 Validated Dataset
Listed in NASA Earthdata CMR and NASA Data Portal — shown once because both records carry DOI 10.5067/smp50-2nocs
This is the PI-produced JPL SMAP-SSS V5.0, level 2B NRT CAP, validated sea surface salinity (SSS) and extreme winds orbital/swath product from the NASA Soil Moisture Active Passive (SMAP) observatory available in near real-time with a latency of about 6 hours.
Description
It is based on the Combined Active-Passive (CAP) retrieval algorithm developed at JPL originally in the context of Aquarius/SAC-D and now extended to SMAP. JPL SMAP V5.0 SSS is based on the newly released SMAP V5 Level-1 Brightness Temperatures (TB).
An enhanced calibration methodology has been applied to the brightness temperatures, which improves absolute radiometric calibration and reduces the biases between ascending and descending passes. The improved SMAP TB Level 1 TB will enhance the use of SMAP Level-1 data for other applications, such as sea surface salinity and winds. The JPL SMAP-SSS L2B CAP NRT product includes data for a range of parameters: derived SMAP sea surface salinity, SSS uncertainty and wind speed/direction data for extreme winds, brightness temperatures for each radiometer polarization, ancillary reference surface salinity, ice concentration, wind and wave height data, quality flags, and navigation data.
Read the rest (3 more)
Each data file covers one 98-minute orbit (15 files per day). Data begins on April 1,2015 and is ongoing, with a 6 hour latency in processing and availability. Observations are global in extent and provided at 25km swath grid with an approximate spatial resolution of 60 km.The SMAP satellite is in a near-polar orbit at an inclination of 98 degrees and an altitude of 685 km.
It has an ascending node time of 6 pm and is sun-synchronous. With its 1000km swath, SMAP achieves global coverage in approximately 3 days, but has an exact orbit repeat cycle of 8 days. On board Instruments include a highly sensitive L-band radiometer operating at 1.41GHz and an L-band 1.26GHz radar sensor providing complementary active and passive sensing capabilities.
Malfunction of the SMAP scatterometer on 7 July, 2015, has necessitated the use of collocated wind speed for the surface roughness correction required for the surface salinity retrieval.
Links
Get the data
- Resource opendap.earthdata.nasa.gov ↗
This dataset can be accessed with the Open-source Project for a Network Data Access Protocol (OPeNDAP) API framework. This service enables variable and dimensional subsetting. The URL redirects to a p
metadata API · download · from NASA CMR, data nasa gov
- PDF archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/smap/docs/JPL-CAP_V5/SMAP-SSS_JPL_V5.0… ↗
JPL CAP SMAP-SSS V5.0 Technical Guide (ATBD, Validation Analysis, Product Format Specification)
documentation · download · from NASA CMR, data nasa gov
- Information on Data Outages & Known Issues archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/aquarius/open/README.KnownIssues.txt ↗
documentation · download · from NASA CMR, data nasa gov
- Data Use and Citation Guidelines podaac.jpl.nasa.gov/CitingPODAAC ↗
documentation · download · from NASA CMR, data nasa gov
- Resource archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/smap/docs/JPL-CAP_V5 ↗
ATBD, Validation Analysis, Product Specifications, etc
documentation · download · from NASA CMR, data nasa gov
- SMAP-SSS Project and Instrument Overview podaac.jpl.nasa.gov/smap ↗
documentation · download · from NASA CMR, data nasa gov
- NASA SMAP Mission Website smap.jpl.nasa.gov ↗
documentation · download · from NASA CMR, data nasa gov
- Original Metadata cmr.earthdata.nasa.gov/search/concepts/C2208418228-POCLOUD.iso19115 ↗
download · from data nasa gov
- Resource harmony.earthdata.nasa.gov ↗
download · from data nasa gov
- github.com /podaac/data-subscriber ↗
This dataset can be downloaded using the podaac-data-subscriber (the recommended tool for bulk downloading PO.DAAC data). It is a Python package for downloading one or many files using the command lin
download · from NASA CMR
- search.earthdata.nasa.gov /search/granules?p=C2208418228-POCLOUD ↗
Browse granule search results in Earthdata Search
download · from NASA CMR
- HTTPS endpoint for data browse and download cmr.earthdata.nasa.gov/virtual-directory/collections/C2208418228-POCLOUD ↗
download · from NASA CMR
- JPEG podaac.jpl.nasa.gov/Podaac/thumbnails/SMAP_JPL_L2B_NRT_SSS_CAP_V5.jpg ↗
download · preview image · from data nasa gov, NASA CMR
Where it is published
- NASA Data Portal dataset page data.nasa.gov/dataset/jpl-smap-level-2b-near-real-time-cap-sea-surface-salin… ↗
landing page · from data nasa gov
- DOI doi.org/10.5067/smp50-2nocs ↗
DOI / persistent id · from NASA CMR
Catalogue records · 3
- CKAN API data.nasa.gov/api/3/action/package_show?id=d90697a5-700f-4643-9ac7-401d26ff5… ↗
metadata API · from data nasa gov
- CMR UMM-JSON cmr.earthdata.nasa.gov/search/concepts/C2208418228-POCLOUD.umm_json ↗
metadata API · from NASA CMR
- CMR record cmr.earthdata.nasa.gov/search/concepts/C2208418228-POCLOUD.html ↗
catalogue entry · from NASA CMR
Topics
- Stated by source
- Salinity · SMAP L-Band Radiometer · Soil Moisture Active and Passive Observatory
- From keywords
- Astronomy & Astrophysics · Earth & Environmental Science · Ocean & Atmospheric Science · Physics
Provenance · 2 source records, 17 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| NASA Earthdata CMR | C2208418228-POCLOUD | 11 d ago | JSON v1 |
| NASA Data Portal | d90697a5-700f-4643-9ac7-401d26ff52e2 | 8 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[field].local:field:astronomy | mapping · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| concepts[field].local:field:earth-environmental | mapping · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| concepts[field].local:field:ocean-atmospheric | mapping · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| concepts[field].local:field:physics | mapping · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| concepts[instrument].gcmd_instrument:smap-l-band-radiometer | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/oceans/salinity-density/salinity/salinity | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[platform].gcmd_platform:smap | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| created_date | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| description | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/Abstract |
| license_text | source · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| publication_date | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| spatial | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/SpatialExtent |
| temporal | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/TemporalExtents |
| title | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/EntryTitle |
| updated_date | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| version_label | source · NASA CMR | connector:nasa_cmr@1.0.0 |