ERS-1 Gridded Level 3 Enhanced Resolution Sigma-0 from BYU
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DescriptionThis European Remote Sensing (ERS) Sigma-0 dataset is generated by the Scatterometer Climate Record Pathfinder (SCP) project at Brigham Young University (BYU) and is generated using a Scatterometer Image Reconstruction (SIR) technique developed by Dr. David Long at BYU. The dataset provides SIR processed Sigma-0 data from the ERS-1 C-band scatterometer, which is also known as the Active Microwave Instrument (AMI). AMI is a multimode radar operating at a frequency of 5.3 GHz (C-band), using vertically polarized antennas for both transmission and reception. The SIR technique results in an enhanced resolution image reconstruction and gridded on an equal-area grid (for non-polar regions) at 8.9 km pixel resolution stored in SIR files; polar regions are gridded at the same resolution using a polar-stereographic technique. A non-enhanced version is provided at 44.5 km pixel resolution in a format known as GRD (i.e., gridded) files. All files are produced in IEEE formatted binary. All data files are separated and organized by region, parameter, and sampling technique (i.e., SIR vs. GRD). The regions of China and Japan are combined into a single region. In addition to Sigma-0, various statistical parameters are provided for added guidance, including but not limited to: standard deviation, measurement counts, pixel time, Sigma-0 error, and average incidence angle. This dataset was once distributed on tape, but has been made available on FTP thanks to the BYU SCP.
Dataset TypeOPEN
MeasurementSPECTRAL/ENGINEERING > RADAR > SIGMA NAUGHT > Normalized Radar Cross-Section
Processing Level3
CoverageRegion: South America
Region: Arctic
Region: Siberia
Region: North America
Region: Central America
Region: Alaska
Region: Southern Asia
Region: North Africa
Region: China
Region: Indonesia
Region: Antarctica
Region: Japan
Region: Europe
Region: Bering Sea
Region: Australia
Region: Greenland
Region: South Africa
Northernmost Latitude: 88.2 degrees
Southernmost Latitude: -79.7 degrees
Westernmost Longitude: -180 degrees
Easternmost Longitude: 180 degrees
Time Span: 1992-Jan-01 to 1996-May-17
ResolutionSpatial Resolution: 0.04 degrees (Latitude) x 0.04 degrees (Longitude)
Temporal Resolution: 6 Day
ProjectionType: Gridded
Detail: Equal-Area and Polar-Stereographic
Ellipsoid: WGS 84
Latency hours
Name: European Remote Sensing Satellite-1 (ERS-1)
Orbit Period: 100.3 minutes
Inclination Angle: 98.5 degrees
Ascending Node: 1970-Jan-01 00:00:00
Name: Active Microwave Instrument (AMI)
Swath Width: 500 km
Description: This is a 5.4 GHz (C-band) microwave scatterometer which provides ocean surface wind and stress vectors over the global ice free oceans, operating on the European Remote Sensing Satellites (ERS-1,2).

ProjectScatterometry Climate Record Pathfinder (SCP)
Data ProviderCreator: BYU/SCP
Release Place: PO.DAAC
Release Date: 2011-Nov-29
Keyword(s)sigma naught, sigma-0, backscatter, normalized radar cross-section, radar, ers, ers-1, ami, c-band, scatterometer, byu, david long, scp, sir, grd
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Citation BYU/SCP. 2011. ERS-1 Gridded Level 3 Enhanced Resolution Sigma-0 from BYU. Ver. 1. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at

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For more information see Data Citations and Acknowledgments.

Journal Reference Early, D. S. and D. G. Long, 2001: Image Reconstruction and Enhanced Resolution Imaging From Irregular Samples. IEEE Transactions on Geoscience and Remote Sensing, Vol. 39, No.2, pp. 291-302.