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You are here: GES DISC Home Education and Outreach Additional Features Science Focus Ocean Color SCIENCE FOCUS: MORE THAN MEETS THE EYE, PART 3


Step III:Adding the Color Palette

The next step in the analysis is actually quite simple, but it makes the data somewhat easier to examine visually.The SeaWiFS chlorophyll color palette is added to the image.The color palette uses shades of purple and blue for low chlorophyll concentrations, with green, yellow, orange, and ultimately red for higher chlorophyll concentrations:

SeaWiFS chlorophyll color bar

When the color palette is applied to the image, the result looks like this:

January 15 Argentina Coast chlorophyll image with color palette applied

Now the variability of chlorophyll concentration is more easily perceived. However, some of the detail is lost due to the fact that there are more grayscale hues than color gradations in the palette, i.e., the chlorophyll concentrations are "grouped" into various colors.

At the mouth of the Rio de la Plata estuary, the orange and red hues of the palette can be seen.Those colors indicate high chlorophyll concentrations, but are questionable due to the presence of high concentrations of sediment. Ocean optical scientists are actively working on algorithms that can produce reliable chlorophyll concentrations in turbid waters such as these.

The next step is to use the flags and masks that have been added to the data to look for some particular conditions.

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Last updated: Apr 06, 2016 10:25 AM ET