SeaWinds on QuikSCAT Level 1B Time-Ordered Earth-Located Sigma0 Version 2
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DescriptionThe SeaWinds on QuikSCAT Level 1B dataset contains the geo-located Sigma-0 measurements and antenna pulse "egg" and "slice" geometries as derived from ephemeris and the Level 1A dataset. 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. This dataset represents the second reprocessed version of the Level 1B release. Special note: QuikSCAT went into a "non-spinning" mode on 22 November 2009. The final rev number in the nominal Operational "spinning" mode is 54296; the "non-spinning" mode of the instrument continued predominantly until the end of the time series. There were some brief periods of "spinning" in between, which include the following days and rev numbers (identified in parenthesis): 1) 29 January 2013 to 5 February 2013 (7909-71011), 2) 14 March 2013 (71536-71549), 3) 18 March 2013 to 21 March 2013 (71590-71634), and 4) 28 March 2013 to 31 March 2013 (71735-71769). Data during the "non-spinning" mode is not consistently calibrated with data from the "spinning" mode. Furthermore, incidence angles change periodically during the "non-spinning" mode. It is therefore advised that only "expert" users attempt using the data during the "non-spinning" mode. For standard L1B data users who wish to access consistently calibrated L1B data during the "non-spinning" mode, please consider using the L1B Averaged Sigma-0 dataset as alternative, which may be accessed by contacting
Dataset TypeOPEN
Processing Level1B
CoverageRegion: Global
Northernmost Latitude: 89.875 degrees
Southernmost Latitude: -89.875 degrees
Westernmost Longitude: -180 degrees
Easternmost Longitude: 180 degrees
Time Span: 1999-Jul-07 to 2014-Nov-12
Granule Time Span: 2010-Mar-18 to 2015-Nov-12
ResolutionSpatial Resolution: 7 km (Along) x 25 km (Across)
Ellipsoid: WGS 84
Latency hours
Swath Width1800000 m
Sample Frequency-
Temporal Repeat (Nominal)12 Hour
Temporal Repeat (Min)1.7 Hour
Temporal Repeat (Max)4 Day
Orbit Period: 100.93 minutes
Inclination Angle: 98.6 degrees
Ascending Node: 1999-Jul-19 06:04:49
Name: SeaWinds Scatterometer (SEAWINDS)
Swath Width: 1800 km
Description: SeaWinds is a Ku-band (13.4 GHz) Scatterometer which features a single circular scanning dish antenna to provide pencil-beam measurements, as opposed to the common fan beam design as seen with other spaceborne scatterometers. The pencil-beam design has several key advantages over the more common fan beam design: higher signal-to-noise ratio, smaller size, and superior coverage. The SeaWinds single antenna utilizes twin offset feeds, thus providing two pencil-beam footprint paths with an elliptical sampling footprint of approximately 25 km (in azimuth) by 37 km (in look/range direction); these pencil beams have opposing polarizations (i.e., vertical and horizontal), thus achieving dual-polarization. The SeaWinds instrument provides a full 1800 km-wide swath coverage (including the nadir region), which allows for a nominal daily measurement coverage of 90% over the ice-free oceans.

ProjectQuick Scatterometer (QUIKSCAT)
Data ProviderCreator: JPL QuikSCAT Project
Release Place: PO.DAAC
Release Date: 2006-Jul-19
Keyword(s)ocean, roughness, ocean roughness, radar, backscatter, normalized radar cross-section, normalized radar cross section, nrcs, sigma-0, sigma0, sigma naught, dB, L1B, level 1B, 1B scatterometer, quikscat, qscat, seawinds
Questions related to this dataset? Contact
User's Guide
QuikSCAT Science Data Record User Guide
Science Data Record User Guide
L1B SIS Document
Software Interface Specifications for L1B
Known Issues
QuikSCAT Known Problems and Issues
Web Page Consisting of Known Problems, Issues, and Data Gaps
Citation JPL QuikSCAT Project. 2006. SeaWinds on QuikSCAT Level 1B Time-Ordered Earth-Located Sigma0 Version 2. Ver. 2. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at

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