RapidScat Level 2B Ocean Wind Vectors in 12.5km Slice Composites Version 1.3
(RSCAT_LEVEL_2B_OWV_COMP_12_V1.3)| Version | 1.3 |
| Processing Level | 2 |
| Start/Stop Date | 2016-Feb-11 to 2016-Aug-19 |
| Short Name | RSCAT_LEVEL_2B_OWV_COMP_12_V1.3 |
| Description | This dataset contains the RapidScat Level 2B 12.5km Version 1.3 science-quality ocean surface wind vectors, which are intended as a replacement and continuation of the Version 1.1 and 1.2 data forward from orbital revolution number 7873, corresponding to 11 February 2016; on 11 Feb 2016, RapidScat entered it's 3rd low signal to noise ratio (SNR) state and the initial calibration of low SNR 3 was preliminary during the Version 1.2 release. The fundamental difference between Version 1.3 and the previous Version 1.2 datasets is that the L1B sigma-0 has been re-calibrated during the periods of low SNR states 3 and 4 using re-pointed QuikSCAT data. The Version 1.1 should still be considered valid up to the first rev of version 1.2 (5127), and similarly version 1.2 shall be considered valid up to the first rev of version 1.3 (7873). The Level 2B wind vectors are binned on a 12.5 km Wind Vector Cell (WVC) grid and processed using the Level 2A Sigma-0 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. This dataset is provided in a netCDF-3 file format that follows the netCDF-4 classic model (i.e., generated by the netCDF-4 API) and made available via FTP and OPeNDAP. For data access, please click on the "Data Access" tab above. It is advised for users to avoid using the "wind_obj" variable in this dataset since it is minimally applicable and meant primarily for quality assurance; for users who wish to access the objective function values for each ambiguity, it is suggested to use only the "ambiguity_obj" variable. The "wind_obj" variable contains DIRTH probabilities (which are derived form the "ambiguity_obj" objective function values) in the range of 0 to 1 indicating the conditional probability that the true direction is within + or - 2.5 degrees of the retrieved wind direction given the observed backscatter measurements in the cell. If you have any questions or concerns, please visit our Forum at https://podaac.jpl.nasa.gov/forum/. |
| DOI | 10.5067/RSX12-L2B13 |
| 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) 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: 2016-Oct-28 Resource: http://www.jpl.nasa.gov/news/fact_sheets/issrapidscat_factsheet.pdf |
| 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, scatterometer, quikscat, seawinds, l2b, l2, level 2, level 2b, version 1, v1, version 1.3, v1.3, V1.3, 1.3 |
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Resolution Spatial Resolution: 12.5 Kilometers x 12.5 Kilometers Temporal Resolution: 12 Hour Coverage Region: GLOBAL North Bounding Coordinate: 61 degrees South Bounding Coordinate: -61 degrees West Bounding Coordinate: -180 degrees East Bounding Coordinate: 180 degrees Time Span: 2016-Feb-11 to 2016-Aug-19 Granule Time Span: 2016-Feb-11 to 2016-Aug-19Swath Width: 900 km Projection Projection Type: Swath Projection Detail: Along-track Grid Ellipsoid: WGS 84 |
| DIRECT ACCESS | |
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| Available for access in-region with AWS Cloud | |
Region | |
| us-west-2 | |
| podaac-ops-cumulus-protected/RSCAT_LEVEL_2B_OWV_COMP_12_V1.3/ | |
| podaac-ops-cumulus-public/RSCAT_LEVEL_2B_OWV_COMP_12_V1.3/ | |
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| Name | Long Name | Unit |
|---|---|---|
| ambiguity_direction | wind direction ambiguity | degrees |
| 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 |
| eflags | extended wind vector cell quality flags | bit |
| flags | wind vector cell quality flags | bit |
| 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 |
| wind_obj | retrieved wind objective function value | 1 |
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| DATA CITATION POLICY | |
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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. 2016. RapidScat Level 2B Ocean Wind Vectors in 12.5km Slice Composites Version 1.3. Ver. 1.3. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/RSX12-L2B13
For more information see Data Citations and Acknowledgments.
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| Journal Reference | Fore, A.G., Stiles, B.W., Chau, A.H., Williams, B.A., Dunbar, R. S., Rodriguez E., 2013: Point-wise Wind Retrieval and Ambiguity Removal Improvements for the QuikSCAT Climatological Data Set. IEEE Trans. Geoscience and Remote Sensing, doi:10.1109/TGRS.2012.2235843. [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.] . |
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| Version | Dataset | Version Date | Status | |
|---|---|---|---|---|
| 1.3 | RapidScat Level 2B Ocean Wind Vectors in 12.5km Slice Composites Version 1.3 | 2022-10-26 | COMPLETE | 2022-10-26T18:30:00.000Z |
| 1.2 | RapidScat Level 2B Ocean Wind Vectors in 12.5km Slice Composites Version 1.2 | 2022-10-26 | COMPLETE | 2022-10-26T18:27:00.000Z |
| 1.1 | RapidScat Level 2B Ocean Wind Vectors in 12.5km Slice Composites Version 1.1 | 2022-10-26 | COMPLETE | 2022-10-26T18:24:00.000Z |
| 1.0 | RapidScat Level 2B Ocean Wind Vectors in 12.5km Slice Composites Version 1.0 | Present | RETIRED. | |