This directory contains graphical images and raw data files 
from CZCS and AVHRR imagery described in

McGillicuddy, D.J., Kosnyrev, V.K., Ryan, J. and J.A. Yoder.  Covariation 
of mesoscale ocean color and sea surface temperature patterns in the 
Sargasso Sea.  Submitted, Deep-Sea Research.


(1) Raw data files
------------------

The filename convention is:

              CZCS files:  cYYDDD.noh
              AVHRR files: tYYDDDhh.noh_d 

In these filenames, YY is year, DDD is year day and hh is the hour (SST only).

The data files consist of a unsigned integer arrays of dimension 512x512.
They are linear in latitude and longitude. 

The following formulas relate pixel values (DN) to chlorophyll-a (mg/m**3)
and temperature (degrees C):

            Chl-a = 10**(DN * 0.012 - 1.4)

            SST = DN/8

Cloud flags:        CZCS:   DN=0
                    AVHRR:  DN<=4

No data flags:      CZCS:   DN=255
                    AVHHR:  DN=255


(2) Example matlab script to read and plot an image.
----------------------------------------------------

Invoke the script frame.m in matlab by issuing the command:

>> frame <image file name>


(3) Plots of the imagery
------------------------

Graphical presentations of each of the 21 image pairs are included
as JPEG files.  The filename convention is:

                    cdYYDDD.jpg

where YY is year, and DDD is a year day.  





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Last modified 2/24/99 by DJM
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