Above is a high altitude infrared aerial photograph of the Susquehanna Water Gap to the North of Harrisburg, Pennsylvania taken from a NASA aircraft in 1974. This map is significant to meas my family is from the Harrisburg area and I can identify with the river and roadways portrayed. Red areas usually indicate vegetation and in this case, wheat fields. Clean water will show up as a very dark, almost black tone, as you can see in the river.
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