RapidScat Level 2A Surface Flagged Sigma-0 and Attenuations in 12.5Km Swath Grid Version 1.1
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| DOI | 10.5067/RSX12-L2A01 |
| Short Name | RSCAT_L2A_12KM_V1.1 |
| Description | This dataset contains the ISS-RapidScat on Level 2A 12.5 km science data record, which provides surface-flagged sigma-0 in 12.5 km Wind Vector Cells processed using the pulse "slice" Sigma-0 data provided by the Level 1B dataset. Due to the circular scan of the RapidScat 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. |
| Version | 1.1 |
| Dataset Type | OPEN |
| Measurement | SPECTRAL/ENGINEERING > RADAR > SIGMA NAUGHT |
| Processing Level | 2A |
| Coverage | Region: 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 |
| Resolution | Spatial Resolution: 12.5 km (Along) x 12.5 km (Across) |
| Projection | Type: Detail: Ellipsoid: WGS 84 |
| Latency | hours |
| Swath Width | 9 m |
| Sample Frequency | 89 |
| 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. |
| Project | International Space Station Rapid Scatterometer (ISS_RapidScat) |
| Data Provider | Creator: RapidScat Project Release Place: PO.DAAC Release Date: 2015-Aug-19 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, 12.5 km, 12.5-km, 12.5, version 1, v1, version 1.1, v1.1, V1.1, 1.1 |
| Persistent ID | PODAAC-RSX12-L2A01 |
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
| PO.DAAC DRIVE | https://podaac-tools.jpl.nasa.gov/drive/files/allData/rapidscat/L2A/12km/v1.1 |
| OPENDAP | https://podaac-opendap.jpl.nasa.gov/opendap/allData/rapidscat/L2A/12km/v1.1/ |
| Format (Compression) | HDF (GZIP) |
| Project Materials | |
| ISS-RapidScat Fact Sheet | http://www.jpl.nasa.gov/news/fact_sheets/issrapidscat_factsheet.pdf Summary of Facts on the ISS-RapidScat Mission |
| Additional Sites | |
| eoPortal Directory for ISS-RapidScat | https://directory.eoportal.org/web/eoportal/satellite-missions/i/iss-rapidscat Detailed background information on the ISS-RapidScat mission published by the eoPortal. |
| Known Issues | |
| RapidScat Scheduled Outages | http://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 12.5Km Swath Grid Version 1.1. Ver. 1.1. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/RSX12-L2A01.
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.] | |||||||
