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Data Object 1994_avhrr_data

PI: J. J. Bisagni
Dataset: Satellite-derived AVHRR SST images


Satellite-derived AVHRR SST images for the US-GLOBEC Georges Bank Program study domain,

39.013 - 45.429 degree North latitude, 63.487 - 72.164 degree West longitude,

1 October 1993 - 2003.

Data Provider

Dr. J. J. Bisagni
Center for Marine Science and Technology
University of Massachusetts
285 Old Westport Road
North Dartmouth, MA 02747
FAX: 508-999-8197

Field Name Descriptions

Field Name Description
Images Satellite number
Description Description of satellite
Contributor Name of contributor providing the image(s)
month Month, with 1 meaning January when image was taken (UTC)
year Year when image was taken (UTC)
status Status of image, e.g. unprocessed, unnavigated, navigated
yrday_utd Year day image was taken, with 1 being January 1 (UTC)
day Day of the month image was taken (UTC)
time Time of day image was taken (UTC)

Summary of Satellites Availabe, by Year

Year Satellite
1993 NOAA-11
1994 NOAA-11 (January - September), NOAA-9 (September - December)
1995 NOAA-11, NOAA-9
1996 NOAA-14
1997 NOAA-14
1998 NOAA-14
1999 NOAA-14, NOAA-15 (starting in December)
2000 NOAA-14, NOAA-15 (January - July), NOAA-16 (October - December)
2001 NOAA-14 (mostly bad, use NOAA-15), NOAA-15 (October - December), NOAA-16
2002 NOAA-14 (still mostly bad, use NOAA-15), NOAA-15, NOAA-16


Additional Information About Image Processing

At the present time all daily NOAA-11 Advanced Very High Resolution Radiometer satellite passes from 1 October 1993 on (generally 2 passes per day) have been remapped (earth-located) to our Georges Bank/Gulf of Maine "standard" region (given below) in a Mercator projection. Our standard region is bounded by:

Precision navigation of each image to within 1 or 2 pixels has begun with the image file names receiving a ".nav" file extension when navigation is completed. Be aware that "un- navigated" images (".rmp" file extension) may possess navigation errors of up to 6 or 7 pixels in the meridional and/or zonal directions. Note that only ".nav" files are being served here at this time.

Daily remapping and weekly backups of these data will continue until after completion of the GLOBEC and Gulf of Maine field programs are completed. Each of these images are in University of Miami XDR04 format, consisting of an 8-bit, 512 X 512 pixel binary image, preceded by three 512-byte header records. The size of each image file (in uncompressed form) is ~250K bytes.

These images are uncompressed and converted from Xbrowse to gif images via the ferret application for display by your favorite browser, such as Internet Explorer, Mozilla, and Firefox.

XBrowse Software

Near real-time, daily, satellite-derived sea surface temperature (SST) data, which cover Georges Bank and the Gulf of Maine are also available for browsing over the Internet in the Xbrowse format. This browse capability is being made available via the Xbrowse (X-window based) client/server system developed by Jim Gallagher (jimg@dcz.gso.uri.edu) in Peter Cornillon's group located at the University of Rhode Island's Graduate School of Oceanography. In addition to visual "browsing" of the data, the Xbrowse system also allows the names of user-selected images to be listed in a file on your local host for later use in retrieving those images from the Xbrowse server via ftp. http://dcz.gso.uri.edu/avhrr-archive/archive.html

The latest Xbrowse client (ver. 3.3.7) and accessory files used to be available for SunOS 4.1.3 (Sun SPARC), OSF 1.3 (DEC Alpha) and Ultrix 4.3 (DECstation) via anonymous ftp from zeno.gso.uri.edu (/pub/xbrowse) and had to be uncompressed, restored (via "tar") and properly installed on your local host for the system to work. You might be able to get help by contacting the datamaster at GSO/URI at datamaster@mail.po.gso.uri.edu.

Assuming that the client is properly installed on your local host, you can start the remote server by typing: xbrowse -server dcz.gso.uri.edu

Those of you who have an earlier version of Xbrowse and would like access to the server should get an update because the latest version handles the Mercator projection properly.

DODS System

These images are also viewable via DODS, Distributed Oceanographic Data System.

Downloading the image

You can capture the gif image if your browser has that capability. In addition, if you would like to download any of the Xbrowse images over the network to your local host for your own use, please contact me directly.

Last edited: November 14, 2007

This document is created from the content of the info file.