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CoastWatch SST

Available since v0.5. The verified dataset is noaacwBLENDEDsstDNDaily, a daily blended day/night SST analysis on (time, latitude, longitude). Latitude has 3,600 centers from -89.975 to 89.975; longitude has 7,200 from -179.975 to 179.975, both spaced 0.05 degrees. The time axis starts at 2019-07-22T12:00:00Z and has gaps; the adapter reads actual available timestamps. Its metadata describes data use as free and open under the GHRSST protocol.

Variable Meaning Units
analysed_sst (default) Sea surface temperature degree_C
analysis_error Estimated analysis error degree_C
sea_ice_fraction Sea ice fraction 1
mask Source mask flags Byte codes; consult source metadata

Require a bbox/location and both timestamps. Bounds include only grid centers and timestamps inside the requested interval. A point (--lat/--lon with no radius) or a box too small to hold a grid center selects the one cell at its middle; a window with no analysis time returns no assets. UTC bounds are inclusive. A date alone as the end runs through that day, so it includes the day's noon analysis. params.stride (or -p stride=2) subsamples both spatial axes with a positive integer. Reduce the area/time window or increase stride when a query exceeds 1,000,000 rows. Unknown parameters and variables fail explicitly.

The asset is raw CSV with coordinate columns, a header, and a second row of units. This avoids the volatile per-request history timestamps observed in NetCDF responses; see ADR 0004.

Upstream revisions

Agencies revise files in place. A locked restore downloads each pinned URL and fails with a checksum mismatch when the bytes have changed; accept the new bytes for chosen entries with pull --update, or re-resolve the whole manifest with pull --force. A lockfile detects changed data; it does not archive it. Keep the cache with the manifest and lockfile. See provenance and drift.

See the service research notes for dated upstream probes.

Metadata sources

Every value in the catalog entry's resolution, cadence, citation, terms, variables, and limits comes from one of these pages. A field the agency does not publish is left empty rather than estimated.

  • Resolution, updates, and terms: the ERDDAP dataset metadata, whose spatial_resolution is 0.05 degree, whose time axis averages one day, and whose license attribute states that the GHRSST protocol describes data use as free and open.
  • Variables: the same metadata, as reproduced in the variable table above.
  • Citation: no citation is published for the ERDDAP dataset, so the entry uses the agency, product, and access form, naming NOAA/NESDIS OSPO as the metadata's creator.
  • Latency is empty: the metadata publishes no lag figure. Its testOutOfDate threshold is a staleness alarm for the ERDDAP server, not a stated latency.

All NOAA datasets.

Reference

noaa:coastwatch-sst · Released · Included since usdata 0.5. CoastWatch Blended Sea Surface Temperature.

At a glance

  • Files: CSV with units row
  • Selection: Grid centers and timestamps inside the requested bounds; optional stride
  • Required inputs: BBox or location, and both timestamps
  • Open locally: usdata[pandas] · Reader guide
  • On usdata.dev: Sea-surface temperature, with a walkthrough

Parameters

Pass these as --param name=value to the CLI, as params: entries in a manifest, or as keyword arguments to build_query.

Parameter Meaning
stride Positive integer subsampling both spatial axes; default 1.

Variables

Variable Units Meaning
analysed_sst degree_C Analysed sea surface temperature
analysis_error degree_C Estimated error of the analysis
sea_ice_fraction 1 Sea ice area fraction
mask — Source mask flags; consult the source metadata for the codes

Catalog facts

  • Availability: since 0.5
  • Domain: Satellite oceanography
  • Spatial resolution: 0.05 degree global grid, about 5 km
  • Temporal resolution: Daily
  • Updates: Daily
  • Terms of use: https://coastwatch.noaa.gov/erddap/info/noaacwBLENDEDsstDNDaily/index.html
  • Citation: NOAA/NESDIS Office of Satellite Products and Operations, Geo-polar Blended Sea Surface Temperature Analysis (noaacwBLENDEDsstDNDaily), accessed via usdata
  • Geographic bounds (WGS84): west -179.975°, south -89.975°, east 179.975°, north 89.975°
  • Catalog date range: 2019-07-22 to open-ended
  • Coverage varies by station, product, and date; the range above does not guarantee observations.
  • Upstream documentation
  • License: GHRSST free and open data
  • Transport: erddap
  • Adapter: usdata.providers.noaa.coastwatch:CoastwatchSst