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    AVHRR Western North Atlantic Sea Surface Temperature (SST) from NOAA Satellites in 2005

AVHRR Western North Atlantic Sea Surface Temperature (SST) from NOAA Satellites in 2005

Website: https://www.bco-dmo.org/dataset/3903
Version: 2013-04-01

» U.S. GLOBEC Georges Bank (GB)

» U.S. GLOBal ocean ECosystems dynamics (U.S. GLOBEC)
Bisagni, James JUniversity of Massachusetts Dartmouth (UMASSD-SMAST)Principal Investigator
Groman, Robert C.Woods Hole Oceanographic Institution (WHOI BCO-DMO)BCO-DMO Data Manager

Dataset Description

MCSST western North Atlantic full resolution domain for 2005. We chose this 2048 X 2048 pixel domain, as it covers almost the entire western North Atlantic region, from south of Florida to north of Newfoundland, Canada, thus incorporating the western Labrador Sea, and the entire eastern seaboard of the US and Canada, including the Florida Current and Gulf Stream regions.

Data Provider:
Dr. J. J. Bisagni
University of Massachusetts Dartmouth
School for Marine Science and Technology
200 Mill Rd., Suite 325
Fairhaven, MA 02719 USA
jbisagni at umassd.edu

As a courtesy, please notify Jim Bisagni via email about your intent to use these data, so that he may keep a record.

Acquisition Description


57.566 latitude top, 24.499 latitude bottom, -82.448 longitude left, -38.798 longitude right

Center latitude: 41.000, center longitude: -60.580

2048 x 2048 pixels

Processing Description

Special data fields are defined to enable the satellite images to be plotted in the MapServer interface including the following: x_pixel_unit (pixel size in the X direction in map units per pixel),  y_pixel_unit (pixel size in the Y direction, which is usually negative map units per pixel), x_correction (rotation about the X axis in degrees), y_correction (rotation about the Y axis in degrees),  x_coordinate (X coordinate of the center of the upper left pixel in longitude degrees), and  y_coordinate (Y coordinate of the center of the upper left pixel in latitude degrees). These values are made accessible to the MapServer by including them as part of the data object. These six data fields correspond to the six lines in the so-called world file.

From Wikipedia (http://en.wikipedia.org/wiki/World_file), "a world file is a plain text computer data file used by geographic information systems (GIS) to georeference raster map images. The file specification was introduced by Esri.

Small-scale rectangular raster image maps can have an associated world file for GIS map software that describes the location, scale and rotation of the map. These world files are six-line files with decimal numbers on each line.

World files do not specify a coordinate system; this information is generally stored somewhere else in the raster file itself or in another companion file, e.g. Esri's .prj file. The generic meaning of world file parameters are:

  • Line 1: A: pixel size in the x-direction in map units/pixel
  • Line 2: D: rotation about y-axis
  • Line 3: B: rotation about x-axis
  • Line 4: E: pixel size in the y-direction in map units, almost always negative
  • Line 5: C: x-coordinate of the center of the upper left pixel
  • Line 6: F: y-coordinate of the center of the upper left pixel

This description is however misleading in that the D and B rotation parameters are not really rotations (in degrees or gradients) and in that as soon as D or B are not zero, the A and E parameters do not correspond to the pixel size any more."

The data object is served with two columns representing the satellite image. The clickable link in the "time" column links to the satellite image that includes a color bar and a clickable link to the actual digital values of the image. This image undergoes a transformation during the serving to include, among other things, the color bar.The overlay image is another representation of the satellite image but this one is used by the MapServer in order to create the overlay image of the satellite image on the display map. This image also undergoes a transformation (by a different procedure) to enable it to be transparent among other changes.


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imagesName of the NOAA satellite providing the images n/a
descriptionDescription of the NOAA satellite providing the AVHRR images n/a
contributorName of the investigator providing the processed images. n/a
x_pixel_unitPixel size in the X direction map units per pixel
y_pixel_unitPixel size in the Y direction. This value is usually negative. map units per pixel
x_correctionRotation about the X axis degrees
y_correctionRotation about the Y axis degrees
x_coordinateX coordinate of the center of the upper left pixel longitude degrees
y_coordinateY coordinate of the center of the upper left pixel latitude degrees
monthMonth n/a
yearFour digit year n/a
statusStatus of the image such as reviewed (by investigator) n/a
yrday_utcUTC year day, starting with 001 as January 1 three digits
dayUTC day of the month two digits
timeUTC time of the image as hours, minutes and fraction of minutes hhmm.mm
ISO_datetime_utcUTC date and time formatted using the ISO standard
overlay_imageLink to the satellite image to be used as the overlay image on the MapServer gif image
color_barColor bar used for the AVHRR image representation of sea surface temperature. This scale is sometimes known as Pete's palette. gif

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Dataset-specific Instrument Name
AVHRR satellite
Generic Instrument Name
Advanced Very High Resolution Radiometer
Generic Instrument 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).

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NOAA Satellites
Start Date
End Date
Western North Atlantic (aka MCSST AFMIS) Multiple satellites including NOAA-12, NOAA-15, NOA16, NOAA-17, NOAA-18, and NOAA-19 depending on the year. NOAA-12: 2004, 2005, 2006 NOAA-15: 2004, 2005, 2006, 2007 NOAA-16: 2005, 2010,2011,2012, 2013 NOAA-17: 2007, 2008, 2009, 2010 NOAA-18: 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014-present NOAA-19: 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014-present Note: The deployment (so far) is supposed to go through 2018 so the last "fix" is set to be in the future (2018). It was deemed a good idea by the data manager to make the deployment consistent with the data.  

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Project Information

U.S. GLOBEC Georges Bank (GB)

Coverage: Georges Bank, Gulf of Maine, Northwest Atlantic Ocean

The U.S. GLOBEC Georges Bank Program is a large multi- disciplinary multi-year oceanographic effort. The proximate goal is to understand the population dynamics of key species on the Bank - Cod, Haddock, and two species of zooplankton (Calanus finmarchicus and Pseudocalanus) - in terms of their coupling to the physical environment and in terms of their predators and prey. The ultimate goal is to be able to predict changes in the distribution and abundance of these species as a result of changes in their physical and biotic environment as well as to anticipate how their populations might respond to climate change. The effort is substantial, requiring broad-scale surveys of the entire Bank, and process studies which focus both on the links between the target species and their physical environment, and the determination of fundamental aspects of these species' life history (birth rates, growth rates, death rates, etc). Equally important are the modelling efforts that are ongoing which seek to provide realistic predictions of the flow field and which utilize the life history information to produce an integrated view of the dynamics of the populations. The U.S. GLOBEC Georges Bank Executive Committee (EXCO) provides program leadership and effective communication with the funding agencies.

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Program Information

U.S. GLOBal ocean ECosystems dynamics (U.S. GLOBEC)

Coverage: Global

U.S. GLOBEC (GLOBal ocean ECosystems dynamics) is a research program organized by oceanographers and fisheries scientists to address the question of how global climate change may affect the abundance and production of animals in the sea. The U.S. GLOBEC Program currently had major research efforts underway in the Georges Bank / Northwest Atlantic Region, and the Northeast Pacific (with components in the California Current and in the Coastal Gulf of Alaska). U.S. GLOBEC was a major contributor to International GLOBEC efforts in the Southern Ocean and Western Antarctic Peninsula (WAP).

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This document is created from the content of the BCO-DMO metadata database.    2019-05-23  21:37:53