| Summary: | 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.abraham@niwa.cri.nz)<br> <br>
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