Dataset: AVHRR WNA 2016

Name: Western North Atlantic Sea Surface Temperature (SST) images collected by NOAA satellites in 2016
Published: 2016-07-19
Keywords: oceans

Cite This Dataset

Project:

U.S. GLOBEC Georges Bank (GB)

Program:

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

Principal Investigator:

James J. Bisagni (University of Massachusetts Dartmouth, UMASSD-SMAST)

BCO-DMO Data Manager:

Robert C. Groman (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

daily updates

Version Date:

2016-07-19

Restricted:

Current State:

Preliminary and in progress

Western North Atlantic Sea Surface Temperature (SST) images collected by NOAA satellites in 2016

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Description

MCSST western North Atlantic full resolution domain for 2016. 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.

Several weeks of images are missing at the beginning of the year as there was a problem with the original data.

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
508-910-6328
jbisagni at umassd.edu

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

Methods & Sampling

Domain:

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

Data 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.

Data Files

File
WNA_SST_2016.csv (Comma Separated Values (.csv), 1.01 MB) MD5:7e6945ab87be0872dbbdfd8775bab511 Primary data file for dataset ID 639087

More Information about this dataset

Funding Sources

None available yet

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
AVHRR_WNA_2004-2018		2004-01-01	NOAA Satellites	James J. Bisagni (Chief Scientist)	data info

Instruments

Advanced Very High Resolution Radiometer

Supplied Name: AVHRR satellite

Supplied Description:

Instrument Type

Generic Name: Advanced Very High Resolution Radiometer

Acronym: AVHRR

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/122/

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).

Parameters

Date and time formats are described in python strftime() syntax.

Supplied Name	Supplied description	Supplied Units	Standard Name
images	Name of the NOAA satellite providing the images	n/a	no_bcodmo_term
description	Description of the NOAA satellite providing the AVHRR images	n/a	brief_desc
contributor	Name of the investigator providing the processed images.	n/a	investigator
x_pixel_unit	Pixel size in the X direction	map units per pixel	x_pixel_unit
y_pixel_unit	Pixel size in the Y direction. This value is usually negative.	map units per pixel	y_pixel_unit
x_correction	Rotation about the X axis	degrees	x_correction
y_correction	Rotation about the Y axis	degrees	y_correction
x_coordinate	X coordinate of the center of the upper left pixel	longitude degrees	x_coordinate
y_coordinate	Y coordinate of the center of the upper left pixel	latitude degrees	y_coordinate
month	Month	n/a	month_utc
year	Four digit year	n/a	year
status	Status of the image such as reviewed (by investigator)	n/a	status
yrday_utc	UTC year day, starting with 001 as January 1	three digits	yrday_utc
day	UTC day of the month	two digits	day_utc
time	UTC time of the image as hours, minutes and fraction of minutes	hhmm.mm	time_utc
ISO_datetime_utc	UTC date and time formatted using the ISO standard		ISO_DateTime_UTC
overlay_image	Link to the satellite image to be used as the overlay image on the MapServer	gif image	no_bcodmo_term
color_bar	Color bar used for the AVHRR image representation of sea surface temperature. This scale is sometimes known as Pete's palette.	gif	color_bar

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Dataset: AVHRR WNA 2016