RapidScat Level 2B Climate Ocean Wind Vectors in 12.5km Footprints Version 2.0
(RSCAT_LEVEL_2B_OWV_CLIM_12_V2)
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Publications citing RapidScat Level 2B Climate Ocean Wind Vectors in 12.5km Footprints Version 2.0
Citation metrics available for years (2014-2022)
| Year | Citation |
|---|---|
| 2019 | Coastal Iberia summertime low‐level flow assessed from scatterometers, Journal of Geophysical Research: Atmospheres ,https://doi.org/10.1029/2018JD028648 |
| Version | 2.0 |
| Processing Level | 2 |
| Start/Stop Date | 2014-Oct-08 to 2016-Aug-19 |
| Short Name | RSCAT_LEVEL_2B_OWV_CLIM_12_V2 |
| Description | This dataset contains the RapidScat Level 2B 12.5km Version 2.0 Climate quality ocean surface wind vectors. The Level 2B wind vectors are binned on a 12.5 km Wind Vector Cell (WVC) grid and processed using the using the "full aperture" normalized radar cross-section (NRCS, a.k.a. Sigma-0) from the L1B dataset. RapidScat is a Ku-band dual beam circular rotating scatterometer retaining much of the same hardware and functionality of QuikSCAT, with exception of the antenna sub-system and digital interface to the International Space Station (ISS) Columbus module, which is where RapidScat is mounted. The NASA mission is officially referred to as ISS-RapidScat. Unlike QuikSCAT, ISS-RapidScat is not in sun-synchronous orbit, and flies at roughly half the altitude with a low inclination angle that restricts data coverage to the tropics and mid-latitude regions; the extent of latitudinal coverage stretches from approximately 61 degrees North to 61 degrees South. Furthermore, there is no consistent local time of day retrieval. The new version has two important improvements over the previous version 1.0. First, an SST-dependent GMF developed by Lucrezia Ricciardulli of Remote Sensing Systems is used in wind retrieval in order to fix persistent speed biases in Ku-band data over cold ocean. Second, flagging is simplified and extra flags are provided. All the previously existing flags are still there and still reflect the same meaning and purpose. A new single bit wind_retrieval_likely_corrupted_flag specifies the approximately 3% of the data which is known to have suboptimal performance due to rain, ice, or a few other rare anomalous cases. Another bit wind_retrieval_possibly_corrupted_flag specifies the approximately 15% of the data near rain, near ice, or near the coast, that is thought to be high quality but may not match up well with numerical wind models due to either remaining rain/ice/land contamination or variability in the winds near ice, rain, and coasts that are not reflected in the NWPs. In addition to these two new bits, copious quality information is provided in the data to allow users to tailor flags to meet their own needs. There is also an added a global attribute called rev_status that specifies whether the RapidScat Instrument was in the original (highest data quality) high SNR mode, or one of the four low SNR time periods, the latter of which indicates the accuracy of winds below 5 m/s is degraded. This attribute also serves to identify MARGINAL orbits in which there are large gaps in the data record due to suboptimal spacecraft attitude. Other than gaps in the data, the accuracy of the winds in the MARGINAL orbits are similar to other orbits. This dataset is provided in netCDF-4 format and made available via FTP and OPeNDAP. For data access, please click on the "Data Access" tab above. |
| DOI | 10.5067/RSX12-L2C20 |
| Measurement | OCEANS > OCEAN WINDS > SURFACE WINDS |
| Swath Width | 900 km |
| Platform/Sensor | ISS / Platform Name: International Space Station (ISS) Orbit Period: 92.91 minutes Inclination Angle: 51.65 degrees RapidScat SENSOR Name: Rapid Scatterometer (RapidScat) (RapidScat) Swath Width: 1100.0 kilometers Description: Spacecraft angular distance from orbital plane relative to the Equator. |
| Project | International Space Station Rapid Scatterometer (ISS_RapidScat) |
| Data Provider | Publisher: PO.DAAC Creator: RapidScat Project Release Place: PO.DAAC Release Date: 2018-Apr-09 Resource: https://podaac.jpl.nasa.gov/ISS-RapidScat |
| Format | netCDF-4 |
| Keyword(s) | international space station, space station, iss, rapidscat, rscat, iss-rapidscat, winds, wind, ocean, ocean wind, ocean winds, ocean surface wind vectors, surface wind vectors, wind speed, wind direction, climate, clim, cdr, climate data record, scatterometer, quikscat, seawinds, l2b, l2, level 2, level 2b, version 1, v1, version 1.0, v1.0, V1.0, 1.0 |
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Resolution Spatial Resolution: 12500 Meters x 12500 Meters Temporal Resolution: Hourly - < Daily Coverage Region: GLOBAL OCEAN North Bounding Coordinate: 61 degrees South Bounding Coordinate: -61 degrees West Bounding Coordinate: -180 degrees East Bounding Coordinate: 180 degrees Time Span: 2014-Oct-08 to 2016-Aug-19 Granule Time Span: 2014-Oct-08 to 2016-Aug-19Swath Width: 900 km Projection Projection Type: Satellite native swath Projection Detail: Geolocation information included for each pixel Ellipsoid: WGS 84 |
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| Available for access in-region with AWS Cloud | |
Region | |
| us-west-2 | |
| podaac-ops-cumulus-protected/RSCAT_LEVEL_2B_OWV_CLIM_12_V2/ | |
| podaac-ops-cumulus-public/RSCAT_LEVEL_2B_OWV_CLIM_12_V2/ | |
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| Name | Long Name | Unit |
|---|---|---|
| ambiguity_direction | wind direction ambiguity | degree |
| ambiguity_obj | wind objective function values | 1 |
| ambiguity_speed | wind speed ambiguity | m s-1 |
| atmospheric_speed_bias | atmospheric speed bias | m s-1 |
| cross_track_wind_speed_bias | relative wind speed bias with respect to sweet spot | m s-1 |
| distance_from_coast | Distance from nearest coastline | km |
| eflags | extended wind vector cell quality flags | bit |
| flags | wind vector cell quality flags | bit |
| gmf_sst | Sea Surface Temperature Used in Geophysical Model Function | Degrees Celsius |
| lat | latitude | degrees_north |
| lon | longitude | degrees_east |
| nudge_wind_direction | model wind direction | degrees |
| nudge_wind_speed | model wind speed | m s-1 |
| num_ambiguities | number of ambiguous wind directions found in point-wise wind retrieval prior to spatial filtering | 1 |
| number_in_aft | number of inner aft looks in wind vector cell | 1 |
| number_in_fore | number of inner forward looks in wind vector cell | 1 |
| number_out_aft | number of outer aft looks in wind vector cell | 1 |
| number_out_fore | number of outer forward looks in wind vector cell | 1 |
| rain_impact | impact of rain upon wind vector retrieval | 1 |
| retrieved_wind_direction | equivalent neutral wind direction at 10 m | degrees |
| retrieved_wind_speed | equivalent neutral wind speed at 10 m | m s-1 |
| retrieved_wind_speed_uncorrected | wind speed without rain correction | m s-1 |
| time | date and time | seconds since 1999-1-1 0:0:0 |
| time_diff | RapidScat - Radiometer observation time difference | minutes |
| wind_obj | retrieved wind objective function value | 1 |
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Citation is critically important for dataset documentation and discovery. Please cite the data as follows, and cite the reference papers when it is appropriate.
| Citation | RapidScat Project. 2018. Rapidscat Level 2B Climate Ocean Wind Vectors in 12.5km Footprints Version 2.0. Ver. 2.0. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/RSX12-L2C20
For more information see Data Citations and Acknowledgments.
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| Journal Reference | [Special Note: This paper describes the wind retrieval algorithm used to process the QuikSCAT version 3 wind product. The RapidScat data was processed using the same technique, with the addition of utilizing the full aperture NRCS data.] Fore, A. G., Stiles, B. W., Chau, A. H., Williams, B. A., Dunbar, R. S., Rodriguez E.. 2014. Point-wise wind retrieval and ambiguity removal improvements for the QuikSCAT climatological data set, IEEE Trans. Geoscience and Remote Sensing, 52, 1. https://doi.org/10.1109/TGRS.2012.2235843 |
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| Version | Dataset | Version Date | Status | |
|---|---|---|---|---|
| 2.0 | RapidScat Level 2B Climate Ocean Wind Vectors in 12.5km Footprints Version 2.0 | 2021-08-03 | COMPLETE | 2021-08-03T20:48:00.000Z |
| 1.0 | RapidScat Level 2B Climate Ocean Wind Vectors in 12.5km Footprints | 2023-01-10 | COMPLETE | 2023-01-10T05:58:00.000Z |