RapidScat Level 2A Surface Flagged Sigma-0 and Attenuations in 25Km Swath Grid Version 1.1

RapidScat Level 2A Surface Flagged Sigma-0 and Attenuations in 25Km Swath Grid Version 1.1
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DOI10.5067/RSX25-L2A01
Short NameRSCAT_L2A_25KM_V1.1
DescriptionThis dataset contains the ISS-RapidScat on Level 2A 25km science data record, which provides surface-flagged sigma-0 in 25km Wind Vector Cells processed using the pulse "egg" Sigma-0 data provided by the Level 1B dataset. Due to the circular scan of the SeaWinds instrument the expected number of Sigma-0 cells per WVC is not constant. To minimize the L2A data volume, the Sigma-0 cell data are stored as "lists" for each WVC row, with each list indexed by a "cell_index" array to indicate the cross-track WVC membership of the data. Each cell is then checked for land or ice and flagged accordingly. Attenuation corrections for each Sigma-0 measurement are also provided. 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 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.
Version1.1
Dataset TypeOPEN
MeasurementSPECTRAL/ENGINEERING > RADAR > SIGMA NAUGHT
Processing Level2A
CoverageRegion: Global
Northernmost Latitude: 61 degrees
Southernmost Latitude: -61 degrees
Westernmost Longitude: 0 degrees
Easternmost Longitude: 360 degrees
Time Span: 2014-Oct-03 to 2016-Mar-10
ResolutionSpatial Resolution: 25 km (Along) x 25 km (Across)
ProjectionType:
Detail:
Ellipsoid: WGS 84
Latency hours
Swath Width9 m
Sample Frequency89
Temporal Repeat (Nominal)12 Hour
Temporal Repeat (Min)1.5 Hour
Temporal Repeat (Max)3 Day
Platform/Sensor
ISS
Platform
Name: International Space Station (ISS)
Orbit Period: 92.91 minutes
Inclination Angle: 51.65 degrees
Ascending Node: 1970-Jan-01 00:00:00
/
RapidScat
SENSOR
Name: Rapid Scatterometer (RapidScat)
Swath Width: 1100 km
Description: The ISS RapidScat instrument is a speedy and cost-effective replacement for NASA's QuikScat Earth satellite, which monitored ocean winds to provide essential measurements used in weather predictions, including hurricane monitoring.

ProjectInternational Space Station Rapid Scatterometer (ISS_RapidScat)
Data ProviderCreator: RapidScat Project
Release Place: PO.DAAC
Release Date: 2015-Jul-31
Resource: http://www.jpl.nasa.gov/news/fact_sheets/issrapidscat_factsheet.pdf
Keyword(s)international space station, space station, iss, rapidscat, rscat, iss-rapidscat, winds, radar, ocean, roughness, ocean roughness, backscatter, normalized radar cross-section, normalized radar cross section, nrcs, dB, sigma-0, sigma0, sigma naught, scatterometer, seawinds, l2a, l2, level 2, level 2a, 25 km, 25-km, 25, version 1, v1, version 1.1, v1.1, V1.1, 1.1
Persistent IDPODAAC-RSX25-L2A01
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Project Materials
ISS-RapidScat Fact Sheethttp://www.jpl.nasa.gov/news/fact_sheets/issrapidscat_factsheet.pdf
Summary of Facts on the ISS-RapidScat Mission
Additional Sites
eoPortal Directory for ISS-RapidScathttps://directory.eoportal.org/web/eoportal/satellite-missions/i/iss-rapidscat
Detailed background information on the ISS-RapidScat mission published by the eoPortal.
Known Issues
revtime.csvhttps://podaac-tools.jpl.nasa.gov/drive/files/allData/rapidscat/ancillary/revtime.csv
ASCII CSV orbital revolution time tables with quality assurance information.
RapidScat Scheduled Outageshttp://manati.star.nesdis.noaa.gov/rscat_images/monitor/RapidScat_Scheduled_Outages.txt
Text file containing reverse chronological list of future scheduled outages and past outages. A start/stop date/time and description is provided for each outage. This list is maintained by NOAA/NESDIS to service near-real-time data users.
Citation RapidScat Project. 2015. RapidScat Level 2A Surface Flagged Sigma-0 and Attenuations in 25Km Swath Grid Version 1.1. Ver. 1.1. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/RSX25-L2A01.

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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.]