RapidScat Level 1B Time-Ordered Geo-Located Sigma-0 Version 1.2
DOI10.5067/RSCAT-L1B12
Short NameRSCAT_L1B_V1.2
DescriptionThis 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/.
Version1.2
Dataset TypeCOMPLETE
MeasurementSPECTRAL/ENGINEERING > RADAR > SIGMA NAUGHT
Processing Level1B
CoverageRegion: 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
ResolutionSpatial Resolution: 7 km (Along) x 25 km (Across)
ProjectionEllipsoid: WGS 84
Swath Width900 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.

ProjectInternational Space Station Rapid Scatterometer (ISS_RapidScat)
Data ProviderPublisher: 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 DRIVEhttps://podaac-tools.jpl.nasa.gov/drive/files/allData/rapidscat/L1B/v1.2
PO.DAAC Drive
OPENDAP DATAhttps://podaac-opendap.jpl.nasa.gov/opendap/allData/rapidscat/L1B/v1.2/
The OPeNDAP base directory location for the collection.
Format (Compression)HDF
ANOMALIES
GENERAL DOCUMENTATION
DATA CITATION POLICY
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

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For more information see Data Citations and Acknowledgments.

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.]
VersionDatasetVersion DateStatus
1.3RapidScat Level 1B Time-Ordered Geo-Located Sigma-0 Version 1.32016-09-28ACTIVE1475024380180
1.2RapidScat Level 1B Time-Ordered Geo-Located Sigma-0 Version 1.22016-04-19ACTIVE1461026788729
1.1RapidScat Level 1B Time-Ordered Geo-Located Sigma-0 Version 1.12015-03-26ACTIVE1427405718626