Oceansat-2 Scatterometer Level 2B Ocean Wind Vectors in 12.5km Slice Composites Version 2

16 Publications Cited this Dataset
Citation metrics available for years (2014-2022)
Processing Level2
Start/Stop Date2010-Jan-16 to 2014-Feb-20
DescriptionThis dataset consists of the version 2 Level 2B science-quality ocean surface wind vector retrievals from the Oceansat-2 scatterometer (OSCAT), which was designed and launched by the Indian Space Research Organization (ISRO) 23 September 2009. This Level 2B dataset is produced by the Jet Propulsion Laboratory (JPL) QuikSCAT Project in cooperation with ISRO. The retrievals are provided on a non-uniform grid within the swath at 12.5 km pixel resolution. This resolution is achieved through a slice composite technique in which high resolution slice measurements from L1B data are composited into a 12.5 km wind vector cell. This newest version contains an improved geophysical model function (GMF), known as QSCAT12, consistent with the Remote Sensing Systems Ku2011 GMF, and an improved rain detection and flagging algorithm; these algorithms are consistent with the latest reprocessed version 3 QuikSCAT L2B dataset. Each L2B file corresponds to a specific orbital revolution (rev) number, which begins at the southernmost point of the ascending orbit. As a Ku-band dual pencil-beam rotating scatterometer, OSCAT design specs bear a strong resemblence of the Ku-band SeaWinds scatterometers on QuikSCAT and Midori-II (ADEOS-II). The primary difference between OSCAT and SeaWinds is the ~4 degree increase in the OSCAT incidence angle, which acts as an offset to the relatively lower altitude of Oceansat-2 to help provide a nearly identical swath width to SeaWinds. In the early phase of cal/val, the JPL QuikSCAT Project identified several problems, most of which have been corrected in this latest L2B version. This dataset release is expected to have an accuracy similar to that of the version 3 L2B QuikSCAT product, with minor caveats, all of which are described by Jaruwatanadilok et al. (2014) and summarized in the User Guide document which is made available in PO.DAAC Drive at https://podaac-tools.jpl.nasa.gov/drive/files/allData/oceansat2/L2B/oscat/jpl/docs/ . Read software is made available in MATLAB, Python, R, and IDL and is accessible in PO.DAAC Drive at https://podaac-tools.jpl.nasa.gov/drive/files/allData/oceansat2/L2B/oscat/jpl/sw/ .
Swath Width1836 km
Name: Oceansat-2 (IRS-O2)
Orbit Period: 99.31 minutes
Inclination Angle: 98.28 degrees
Name: OceanSat Scatterometer (OSCAT)
Swath Width: 1840.0 kilometers
Description: Spacecraft angular distance from orbital plane relative to the Equator.

ProjectQuick Scatterometer (QUIKSCAT)
Data ProviderPublisher: PO.DAAC
Creator: SeaPAC
Release Place: PO.DAAC
Release Date: 2013-Feb-26
Resource: https://podaac-tools.jpl.nasa.gov/drive/files/OceanWinds/oceansat2/L2B/oscat/jpl/docs/

Keyword(s)wind data, wind, ocean wind, wind speed, vector, vectors, ocean wind vector, ocean wind vectors, oceansat, oceansat-ii, oceansat-II, oceansat-2, oscat, isro, indian, scatterometer, l2b
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Spatial Resolution: 12500 Meters x 12500 Meters
Temporal Resolution: Hourly - < Daily
Spatial Coverage
North: 90 degrees South: -90 degrees West: 0 degrees East: 180 degrees 
North: 90 degrees South: -90 degrees West: -180 degrees East: 0 degrees 
Time Span: 2010-Jan-16 to 2014-Feb-20
Granule Time Span: 2010-Jan-16 to 2014-Feb-20
Swath Width: 1836 km
Projection Type: Satellite Native Swath
Projection Detail: Geolocation information included for each pixel
Ellipsoid: WGS 84
NameLong NameUnit
atmospheric_speed_biasatmospheric speed biasm s-1
cross_track_wind_speed_biasrelative wind speed bias with respect to sweet spotm s-1
eflagsextended wind vector cell quality flagsbit
flagswind vector cell quality flagsbit
nudge_wind_directionmodel wind directiondegrees
nudge_wind_speedmodel wind speedm s-1
num_ambiguitiesnumber of ambiguous wind directions found in point-wise wind retrieval prior to spatial filtering1
rain_impactimpact of rain upon wind vector retrieval1
retrieved_wind_directionequivalent neutral wind direction at 10 mdegrees
retrieved_wind_speedequivalent neutral wind speed at 10 mm s-1
timedate and timeseconds since 1999-1-1 0:0:0
wind_speed_uncorrectedwind speed without rain correctionm s-1
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 SeaPAC. 2013. Oceansat-2 Scatterometer Level 2B Ocean Wind Vectors in 12.5km Slice Composites Version 2. Ver. 2. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/OSCT2-L2BV2

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For more information see Data Citations and Acknowledgments.

Journal Reference Jaruwatanadilok, S., Stiles, B. W., and Fore, A. G.. 2014. Cross-Calibration Between QuikSCAT and Oceansat-2, IEEE, 52, 10. https://doi.org/10.1109/TGRS.2013.2295539