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Cover: Top image shows a FEMA flood insurance rate map overlaid on aerial orthoimagery from the U.S. Department of Agriculture’s National Agriculture Imagery Program. (Note that the images are not orthorectified.) Bottom image shows a digital elevation model called a triangular irregular network (TIN). TIN courtesy Dr. Pankaj Agarwal, Duke University. Cover design by Van Nguyen.

Copyright 2007 by the National Academy of Sciences. All rights reserved.

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