The Antarctic Iceberg Tracking Database
1978 & 1992-2008 (Brigham Young University)
Kieth Stuart, Ben Lambert, Jarom Ballantyne, and David G. Long
18 Aug 2008

(Iceberg Tracks from 1978 & 1992-2008)

18 Aug 2008, The QuikSCAT data based has been updated and revised through the end of July 2008.

Using five different satellite scatterometer instruments, we have produced an iceberg tracking database.  The BYU database includes icebergs identified in enhanced resolution scatterometer backscatter images during July-Sept. 1978 (from Seasat), July 1996-June 1997 (from NSCAT), 1992-2001 (from ERS-1/2), and June 1999-present (from QuikSCAT). Images were obtained from the Scatterometer Climate Record Pathfinder (SCP) project.

Data sets from five different spaceborne scatterometer and radiometer instruments are used in the study.  For each data set resolution enhancement is performed by BYU's Scatterometer Image reconstruction (SIR) and/or SIR Filtering (SIRF) algorithms.  The scatterometer instruments used in this study are the Seasat-A Satellite Scatterometer (SASS), the European Space Agency's Remote Sensing Satellite 1(2) (ERS-1/-2), the NASA Scatterometer (NSCAT), and the QuikSCAT/SeaWinds scatterometer (QSCAT).  The Seasat-A scatterometer (SASS) was a dual-polarization Ku-band (14.6 GHz) scatterometer that operated from July to Sept. 1978. Using the SIRF algorithm, Antarctic images are generated every 12 & 48 days (a longer time is required for SASS compared to other instruments due to the sampling characteristics of the nominally 50 km backscatter measurements). The ERS-1/2 spacecraft carried a C-band (5.3 GHz) active microwave instrument (AMI).  The scatterometer mode provides nominally 50 km resolution data.  Using SIR, Antarctic images are produced every 6 days.  The ERS-1/2 scatterometers operated from Jan. 1992 to Jan. 2001.  The NSCAT scatterometer is a Ku-band Doppler radar similar to SASS, but with dual-side measurement capability and a dense 25 km resolution sampling.  Using SIRF, Antarctic images were produced every 3 days.  The NSCAT mission lasted from Sept. 1996 to June 1997.  QuikSCAT was launched as a ``quick recovery'' mission to help fill the gap created by loss of NSCAT due a satellite failure.  This advanced scatterometer allows daily images of Antarctica to be created.  QuikSCAT has opperated from July 1999 to the present.

The initial position for each iceberg is located based on either (1) a position reported by the National Ice Center (NIC)'s web page (URL: http://www.natice.noaa.gov/) or (2) by the sighting of a moving iceberg in a time series of scatterometer images.  From an initial start point, the iceberg is tracked in the scatterometer image time series. Gaps in the position track result from missing scatterometer data and from the occasional loss of contrast between the iceberg and surrounding area during summer months.  For each image a lat/lon position is reported for each iceberg.

Iceberg positions are reported in a separate ASCII text file for each iceberg. The file name is the same as that of the iceberg.  For example the file "b10a.qscat" contains the position track information for B10A.  A few lines from the b10a.qscat file are shown below:

lat: -59.1366 lon: -58.4785 x: 622 y: 2737 file: qush-a-Ant99-202-202.sir backscat: -2.331 contrast: -21.1020
lat: -59.1740 lon: -58.1709 x: 628 y: 2743 file: qush-a-Ant99-203-203.sir backscat: -7.472 contrast: -15.6960
lat: -59.1692 lon: -58.4396 x: 624 y: 2737 file: qush-a-Ant99-204-204.sir backscat: -13.778 contrast: -16.1915

Note that latitude and longitude are specified in decimal degrees with positive North and East, respectively.  The next two numbers are the x and y BYU SIR-file format pixel coordinates within the scatterometer image where the iceberg position was determined. The last section contains the name of the scatterometer image file from the SCP image set used to track the selected position. In the revised QuikSCAT database, only science from the SCP image set are used.

The iceberg database can be obtained via the links shown below.  If desired, data can be imported into Microsoft Excel or other spreadsheet programs as "space delimited data".

Dr. David G. Long                                  long@ee.byu.edu
Director, BYU Center for Remote Sensing    http://www.cers.byu.edu/
Professor, Electrical and Computer Eng. Dept. http://www.ee.byu.edu/
Brigham Young University                       http://www.byu.edu/
459 Clyde Building                               voice: 801-422-4383
Provo, Utah    84602                               fax: 801-422-0201

Microwave Earth Remote Sensing (MERS) Lab:  http://www.mers.byu.edu/
Scatterometer Climate Record Pathfinder:    http://www.scp.byu.edu/