SeaWinds on QuikSCAT Level 3 Sigma-0 Global Rectangular Browse Images
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|Description||This dataset contains GIF images of global, rectangular-gridded, daily averaged Sigma-0 retrievals from SeaWinds on QuikSCAT retrievals, which are generated using a Scatterometer Image Reconstruction (SIR) technique developed by Dr. David Long at Brigham Young University (BYU). The SeaWinds scatterometer scans at two nominal incidence angles, 46 degrees and 54.1 degrees, corresponding to the inner and outer beams respectively. The inner beam is horizontally polarized while the outer beam is vertically polarized. The GIF image files are separated according to polarization, and the averaged Sigma-0 measurements are displayed in grayscale with no color bar. Very bright areas indicate high Sigma-0 averages. It should be noted that these GIF images are meant for browse purposes only and should not be considered science quality. The science quality source dataset containing the SIR files used to generate the GIF images is accessible here: http://podaac.jpl.nasa.gov/dataset/QSCAT_BYU_L3_OW_SIGMA0_GLOBAL_RECTANGULAR_BROWSE_MAPS_LITE. An additional complimentary dataset of SIR files contains the full daily Sigma-0 statistcs: http://podaac.jpl.nasa.gov/dataset/QSCAT_BYU_L3_OW_SIGMA0_GLOBAL_RECTANGULAR_BROWSE_MAPS_FULL. This dataset is generated by the Scatterometer Climate Record Pathfinder (SCP) project at BYU.|
|Measurement||SPECTRAL/ENGINEERING > RADAR > SIGMA NAUGHT > Normalized Radar Cross-Section|
CRYOSPHERE > SEA ICE > ICE EXTENT
Northernmost Latitude: 89.6 degrees
Southernmost Latitude: -89.6 degrees
Westernmost Longitude: 0 degrees
Easternmost Longitude: 360 degrees
Time Span: 1999-Jul-19 to 2009-Nov-21
|Resolution||Spatial Resolution: 0.201 degrees (Latitude) x 0.201 degrees (Longitude)|
Temporal Resolution: 1 Day
Ellipsoid: WGS 84
Name: QUIKSCAT (QUIKSCAT)
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.
|Project||Scatterometry Climate Record Pathfinder (SCP)|
|Data Provider||Creator: BYU/SCP|
Release Place: PO.DAAC
Release Date: 2001-Mar-20
|Keyword(s)||sigma-0, sigma0, backscatter, sir, byu, scp, david long|
Questions related to this dataset? Contact email@example.com
|Format (Compression)||GIF (NONE)|
|Citation||BYU/SCP. 2001. SeaWinds on QuikSCAT Level 3 Sigma-0 Global Rectangular Browse Images. Ver. 1. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/QSBYU-GLBIM.
For more information see Data Citations and Acknowledgments.
|Journal Reference||Chen, R. and D. Long. March, 2001. BYU Daily Browse Images of QuikSCAT Sigma-0 Measurements. JPL Document D-20412. Jet Propulsion Laboratory, Pasadena, CA.|