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Daily data files for this L3 product are based on SSS averages spanning an 8-day moving time window.  Associated file variables include: derived SSS with associated uncertainties and wind speed data from SMAP, ancillary ice concentration and HYCOM surface salinity data. SMAP data begins on April 1, 2015 and is ongoing, with a 7-day latency in processing and availability. L3 products are global in extent and gridded at 0.25degree x 0.25degree with an approximate spatial resolution of 60km.  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.","stac_version":"1.0.0","stac_extensions":["https://stac-extensions.github.io/storage/v2.0.0/schema.json"],"extent":{"spatial":{"bbox":[[-180,-90,180,90]]},"temporal":{"interval":[["2015-04-30T12:00:00.000Z",null]]}},"assets":{"browse":{"href":"https://podaac.jpl.nasa.gov/Podaac/thumbnails/SMAP_JPL_L3_SSS_CAP_8DAY-RUNNINGMEAN_V5.jpg","title":"Download SMAP_JPL_L3_SSS_CAP_8DAY-RUNNINGMEAN_V5.jpg","type":"image/jpeg","roles":["browse"]},"thumbnail":{"href":"https://podaac.jpl.nasa.gov/Podaac/thumbnails/SMAP_JPL_L3_SSS_CAP_8DAY-RUNNINGMEAN_V5.jpg","title":"Thumbnail","description":"Thumbnail","roles":["thumbnail"]},"nasa":{"href":"https://search.earthdata.nasa.gov/search/granules?p=C2208422957-POCLOUD","title":"Direct Download [1]","description":"Browse granule search results in Earthdata Search","roles":["data"]},"https://github":{"href":"https://github.com/podaac/data-subscriber","title":"Direct Download [2]","description":"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 line interface. The URL redirects to the data-subscriber home page with instructions for utilizing the tool","roles":["data"]},"s3_podaac_ops_cumulus_protected_SMAP_JPL_L3_SSS_CAP_8DAY_RUNNINGMEAN_V5_":{"href":"s3://podaac-ops-cumulus-protected/SMAP_JPL_L3_SSS_CAP_8DAY-RUNNINGMEAN_V5/","roles":["data"],"title":"podaac_ops_cumulus_protected_SMAP_JPL_L3_SSS_CAP_8DAY_RUNNINGMEAN_V5_","storage:refs":["aws"]},"s3_podaac_ops_cumulus_public_SMAP_JPL_L3_SSS_CAP_8DAY_RUNNINGMEAN_V5_":{"href":"s3://podaac-ops-cumulus-public/SMAP_JPL_L3_SSS_CAP_8DAY-RUNNINGMEAN_V5/","roles":["data"],"title":"podaac_ops_cumulus_public_SMAP_JPL_L3_SSS_CAP_8DAY_RUNNINGMEAN_V5_","storage:refs":["aws"]},"s3_credentials":{"href":"https://archive.podaac.earthdata.nasa.gov/s3credentials","title":"S3 credentials API endpoint","roles":["metadata"]},"s3_credentials_documentation":{"href":"https://archive.podaac.earthdata.nasa.gov/s3credentialsREADME","title":"S3 credentials API endpoint documentation","roles":["metadata"]},"metadata":{"href":"https://cmr.earthdata.nasa.gov/search/concepts/C2208422957-POCLOUD.xml","title":"CMR XML metadata for C2208422957-POCLOUD","type":"application/xml","roles":["metadata"]}},"providers":[{"name":"POCLOUD","roles":["producer"]},{"name":"NASA EOSDIS","roles":["host"]}],"links":[{"rel":"self","href":"https://cmr.earthdata.nasa.gov/stac/POCLOUD/collections/SMAP_JPL_L3_SSS_CAP_8DAY-RUNNINGMEAN_V5_5.0","type":"application/json"},{"rel":"root","href":"https://cmr.earthdata.nasa.gov/stac","type":"application/json","title":"Root Catalog"},{"rel":"parent","href":"https://cmr.earthdata.nasa.gov/stac/POCLOUD/collections","type":"application/json","title":"Provider Collections"},{"rel":"license","href":"https://www.earthdata.nasa.gov/engage/open-data-services-software-policies/data-use-guidance","title":"EOSDIS Data Use Policy","type":"text/html"},{"rel":"about","href":"https://cmr.earthdata.nasa.gov/search/concepts/C2208422957-POCLOUD.html","title":"HTML metadata for collection","type":"text/html"},{"rel":"via","href":"https://cmr.earthdata.nasa.gov/search/concepts/C2208422957-POCLOUD.native","title":"Native metadata for collection","type":"application/xml"},{"rel":"via","href":"https://cmr.earthdata.nasa.gov/search/concepts/C2208422957-POCLOUD.echo10","title":"ECHO10 metadata for collection","type":"application/echo10+xml"},{"rel":"via","href":"https://cmr.earthdata.nasa.gov/search/concepts/C2208422957-POCLOUD.json","title":"CMR JSON metadata for collection","type":"application/json"},{"rel":"via","href":"https://cmr.earthdata.nasa.gov/search/concepts/C2208422957-POCLOUD.umm_json","title":"CMR UMM_JSON metadata for collection","type":"application/vnd.nasa.cmr.umm+json"},{"rel":"items","href":"https://cmr.earthdata.nasa.gov/stac/POCLOUD/collections/SMAP_JPL_L3_SSS_CAP_8DAY-RUNNINGMEAN_V5_5.0/items","type":"application/geo+json","title":"Collection Items"}],"license":"CC0-1.0","keywords":["EARTH SCIENCE","SALINITY","SALINITY/DENSITY","OCEANS","SURFACE WINDS","OCEAN WINDS"],"summaries":{"platform":["SMAP"],"instruments":["SMAP L-BAND RADIOMETER"]},"storage:schemes":{"aws":{"type":"aws-s3","platform":"https://{bucket}.s3.{region}.amazonaws.com","bucket":"podaac-ops-cumulus-protected","region":"us-west-2"}}}