Tuesday, December 2, 2008

Sebago

Sebago Lake, about 20 miles northwest of Portland, is the deepest lake in Maine. In some places, the lake bottom is more than 300 feet below the water surface--and more than 70 feet below sea level. The lake itself is basically a puddle left over from glaciers melting at the end of the last Ice Age. The colored splotches on it...well, they're real, but they're not real. This image is a composite of thousands of aerial photos of the lake and surrounding land, and each splotch represents a separate snapshot of the water taken during a flightline. As the plane flew back and forth, changes in sun angle, amount of cloudiness, water depth, wind ruffling the surface, muddiness, etc., resulted in slightly varying water coloration in the different aerial snapshots. When the plane flew over land, the various snapshots did not pick up such subtle differences because land surfaces reflect back only a fraction of the amount of light reflected by water.

I took the composite image and greatly overstretcheded the color contrast, till the slight variations showed up as bright, distinct patches of color. My kind of lake.

We get our drinking water from Sebago. The water from the red splotches tastes the best.



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