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avhrr_1993

BCO-DMO dataset:  1993_avhrr

Data Object 1993_avhrr

Contacts

Name         Role
James J Bisagni         Principal Investigator
Robert C. Groman         BCO-DMO Data Manager

Dataset brief description

1993 AVHRR images for the US-GLOBEC Georges Bank Program

Dataset description

AVHRR SST Images Satellite-derived AVHRR SST images for the US-GLOBEC Georges Bank Program study domain (combined Gulf of Maine & Georges Bank area):

39.114 - 45.504 degree North latitude, 63.510 - 72.156 degree West longitude,

1 October 1993 - 2003.

Data Provider: Dr. J. J. Bisagni, Department of Estuarine & Ocean Sciences, University of Massachusetts/Dartmouth, 200 Mill Rd., Suite 325  Fairhaven, MA 02719 508-910-6328. E-mail: jbisagni@umassd.edu.

Summary of Satellites Available, by Year

Year Satellite
1993 NOAA-11
1994 NOAA-11 (January - September), NOAA-9 (September - December)
1995 NOAA-9, NOAA-14
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 (January - October), NOAA-16

2003 NOAA-16, NOAA-17

Notes
1. The image aspect ratio is now correct. The images should be square. This problem within the IDL engine was solved November 2007 by switching to the ferret application to generate the images.
2. Images are 512 X 512 pixels, possess a resolution of 1.4 km and are displayed as .GIF images.
3. The archive 'switches' from NOAA-11 to NOAA-9 during September 1994 due to the NOAA-11 failure in September 1994.
4. Starting in 1994, all NOAA-9, -12 and -14 overpasses are remapped to the above domain and added to the archive on a daily basis.
5. At the end of each month, all the month's images are precision navigated to within 1-2 pixels (1.4-2.8 km). NOAA-12 and -14 data are then saved to tape and deleted, due to calibration problems with NOAA-12 and -14 and to conserve disk space.
6. During the initial data acquisition time, images from the current month may possessed navigation errors of up to 3-5 pixels or more in the X and/or Y directions.
7. Starting August 2002, images from NOAA-17 ('b') became available. They seem to have replaced the NOAA-14 ('f') images.
8. The colorbar used is derived from so-called Pete's Palette, or pete24, and converted to an equivalent palette in the ferret scheme. (See petespalette.spk.

Additional Information About Image Processing
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:

39.114 - 45.504 degree North latitude, and
63.510 - 72.156 degree West longitude.

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- navigate' 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.

Up until July 2012, these images were uncompressed and converted from DSP compressed files to gif images via the ferret application for display by your favorite browser, such as Firefox, Internet Explorer, and Safari. Starting July 29, 2012, the gif images were served from files converted to gif images in a batch operation by Kent Gardner at UMass/Dartmouth and served online without using ferret.

The center latitude is 42.309 degrees North and the center longitude
is 67.830 degrees West. The slope and Y-intercept for converting the 8-bit image byte values to SST in degrees Centegrade are 0.125 and 0, respectively.

The equation information (slope + intercept) are IDENTICAL for both the OI and realtime images, with SSTs going from 0 through 31.875 degrees Centigrade.

XBrowse Software
Near real-time, daily, satellite-derived sea surface temperature (SST) data, which cover Georges Bank and the Gulf of Maine  were also available for browsing over the Internet in the Xbrowse format. However, this software is no longer available.

DODS/OPeNDAP System
These images are no longer viewable via DODS which has been replaced by OPeNDAP. The images cannot be viewable via OPeNDAP either, since the University of Miami's DSP format is no longer supported.

Downloading the image
You can capture the gif image as most browsers have that capability. In addition, you can download the DSP compressed file for your own use using the link on the web page. Please contact Dr. James Bisagni directly.

Last edited: August 8, 2012

Acquisition description

Satellite-derived AVHRR SST images for the US-GLOBEC Georges Bank Program study domain, 39.114 - 45.504 degree North latitude, 63.510 - 72.156 degree West longitude, 1 October 1993 - 2003.

Processing description

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 projectio. Our standard region is bounded by:
39.114 - 45.504 degree North latitude, and
63.510 - 72.156 degree West longitude.

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.


Field Names List

ParameterDescriptionUnits
Images

Satellite number

 
Description

Description of satellite

 
Contributor

Name of contributor providing the image(s)

 
color_bar

Link to legend showing color of image and water temperature

 
month

Month, with 1 meaning January when imagewas 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, with1 being January 1 (UTC)

 
day

Day of the month image was taken (UTC)

 
time

Time of day image was taken (UTC)

 

Deployment List

NOAA-11 NOAA-11-GB

Instruments List

  1. Advanced Very High Resolution Radiometer:

    Short name: AVHRR
    PI supplied instrument name: Advanced Very High Resolution Radiometer
    Dataset-specific description:

    Advanced Very High Resolution Radiometer (AVHRR). Carried aboard the National Oceanic and Atmospheric Administration`s (NOAA) Polar Orbiting Environmental Satellite series, the AVHRR sensor is a broad-band, 4- or 5-channel scanning radiometer, sensing in the visible, near-infrared, and thermal infrared portions of the electromagnetic spectrum.
    Additional description.

    Generic description:

    "The AVHRR instrument consists of an array of small sensors that record (as digital numbers) the amount of visible and infrared radiation reflected and (or) emitted from the Earth's surface" (more information).


getinfor version: May 4, 2016/V1.34

This document is created from the content of the BCO-DMO metadata database.    2017-12-17  20:32:16