SeaWiFS images of the SOIREE bloom from the R/V Tangaroa 61TG_3052 cruise in the Southern Ocean during 1999 (SOIREE project)

This dataset contains images of the SOIREE bloom, as described in
<br>
Abraham, E.R., Law, C.S., Boyd, P.W., Lavender, S.J., Maldonado, M.T.,
<br>
and Bowie, A.R. (2000) Importance of stirring in the development of <br>
an iron-fertilized bloom. Nature 407, 727-730. <br>
<br>
The SeaWiFS data were provided by the NASA/DAAC GSFC and are copyright
<br>
of Orbital Imaging Corps and the NASA SeaWiFS project. The data were<br>
processed at CCMS-PML by Samatha Lavender.<br>
<br>
The images are in PNG format. Chlorophyll values can be extracted <br>
from the imagery by applying the conversion equation: <br>
<br>
log10(chl)=((Pixel value)*slope)+log10(intercept)<br>
<br>
where slope = 0.015 and intercept = 0.01.<br>
<br>
The images are in a non-standard Mercator projection and the following<br>
formulae may be used to convert latitude/longitude (lat/lon) positions <br>
to x/y pixel co-ordinates or vica-versa.<br>
<br>
Given lat and lon<br>
Calculate x position: <br>
FractX = (lon - minlon) / (maxlon - minlon)<br>
x = cols * FractX<br>
<br>
Calculate y position:<br>
Ymin=logn(tan(DEGTORAD*(45.0+(lat/2.0))))<br>
Ymax=logn(tan(DEGTORAD*(45.0+(maxlat/2.0))))<br>
y=(cols *(Ymax-Ymin))/(DEGTORAD*(maxlon-minlon))<br>
<br>
Given x and y<br>
Calculate Longitude:<br>
Fractx=(x-1)/(cols-1)<br>
lon=Fractx*(maxlon-minlon)+minlon<br>
<br>
Calculate Latitude:<br>
Ymax=logn(tan(DEGTORAD*(45.0+(maxlat/2.0))));<br>
Ymin=Ymax-(y-1)*DEGTORAD*(maxlon-minlon)/(cols-1);<br>
lat= 2*(atan(exp(Ymin))/DEGTORAD - 45);<br>
<br>
<br>
Where rows = 431 cols = 445 minlon =137.0 maxlon = 145.0 maxlat = -59.001762<br>
DEGTORAD - conversion from degrees to radians (PI/180.0)<br>
<br>
Queries and permission to use the images should be addressed to <br>
Edward Abraham ([e-mail])<br>
<br>