RapidScat Level 1B Time-Ordered Geo-Located Sigma-0 Version 1.2
(RSCAT_L1B_V1.2)This dataset will be available through Earthdata Cloud only, starting September, 2022. Learn More
| DOI | 10.5067/RSCAT-L1B12 |
| Short Name | RSCAT_L1B_V1.2 |
| Description | This dataset contains the ISS-RapidScat Version 1.2 Level 1B geo-located Sigma-0 measurements and antenna pulse "egg" and "slice" geometries as derived from ephemeris and the Level 1A dataset. Version 1.2 is intended as a replacement and continuation of the Version 1.1 data forward from orbital revolution number 5127, corresponding to 19 August 2015; the overlapping time period starting on 19 August 2015 corresponds to the first time period of the recorded low signal-to-noise ratio (SNR). This Version 1.2 dataset differs from the previous Version 1.1 dataset as follows: 1) L1B sigma-0 has been re-calibrated during the periods of low signal-to-noise ratio (SNR) and 2) during low SNR periods the L1B sigma-0 calibration is determined using re-pointed L1B QuikSCAT data. The pulse "egg" represents the complete footprint of the pulse, which has a spatial geometry of approximately 25 km by 35 km. There are 8 slices that constitute the range-binned components of a pulse each of which has a spatial geometry of approximately 25 km by 7 km. The orientation of the long dimension of the slices varies with the rotation of the antenna and thus does not align with the along/across track orientation of the wind vector grid in the L2B/L2A products. Data are provided in single-orbit files in HDF-4 format. 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 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. Caution: this dataset is intended for expert use only. If you must use RapidScat Sigma-0 data but you are unsure about how to use the L1B data record, please consider using either of the following L2A datasets: 1) http://podaac.jpl.nasa.gov/dataset/RSCAT_L2A_12KM_V1.2 or 2) http://podaac.jpl.nasa.gov/dataset/RSCAT_L2A_25KM_V1.2. If you have any questions or concerns, please visit our Forum at https://podaac.jpl.nasa.gov/forum/. |
| Version | 1.2 |
| Dataset Type | COMPLETE |
| Measurement | SPECTRAL/ENGINEERING > RADAR > SIGMA NAUGHT |
| Processing Level | 1B |
| 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: 2015-Aug-19 to 2016-Aug-19 Granule Time Span: 2015-Aug-19 to 2016-Aug-19 |
| Resolution | Spatial Resolution: 7000 Meters x 25000 Meters |
| Projection | Ellipsoid: WGS 84 |
| 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-Apr-18 Resource: http://www.jpl.nasa.gov/news/fact_sheets/issrapidscat_factsheet.pdf |
| Keyword(s) | international space station, space station, iss, rapidscat, rscat, iss-rapidscat, radar, ocean, roughness, ocean roughness, backscatter, normalized radar cross-section, normalized radar cross section, nrcs, dB, sigma-0, sigma0, sigma naught, scatterometer, seawinds, L1B, L1, 1B, Level 1B, Level 1, version 1, v1, version 1.2, v1.2, V1.2, 1.2 |
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
| DIRECT ACCESS | |
| PO.DAAC DRIVE | https://podaac-tools.jpl.nasa.gov/drive/files/allData/rapidscat/L1B/v1.2 |
| OPENDAP DATA | https://podaac-opendap.jpl.nasa.gov/opendap/allData/rapidscat/L1B/v1.2/ |
| Format | HDF |
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| GENERAL DOCUMENTATION | |
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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 1B Time-Ordered Geo-Located Sigma-0 Version 1.2. Ver. 1.2. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/RSCAT-L1B12
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 | |
|---|---|---|---|---|
| 1.1 | RapidScat Level 1B Time-Ordered Geo-Located Sigma-0 Version 1.1 | 2015-03-26 | COMPLETE | 2015-03-26T21:35:18.626Z |
| 1.3 | RapidScat Level 1B Time-Ordered Geo-Located Sigma-0 Version 1.3 | 2016-09-28 | COMPLETE | 2016-09-28T00:59:40.180Z |
| 1.2 | RapidScat Level 1B Time-Ordered Geo-Located Sigma-0 Version 1.2 | 2016-04-19 | COMPLETE | 2016-04-19T00:46:28.729Z |