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NOTICE: The project that is the subject of this report was approved by the Governing Board of the National Research Council, whose members are drawn from the councils of the National Academy of Sciences, the National Academy of Engineering, and the Institute of Medicine. The members of the committee responsible for the report were chosen for their special competences and with regard for appropriate balance.

This study was supported by the Department of Commerce / U.S. Census Bureau Award No. YA123-05-SE-0220, Department of Homeland Security Award No. HSHQDC-06-P-00051, Department of Interior / Bureau of Land Management Award No. PAA-03-7087, Environmental Systems Research Institute, and U.S. Geological Survey / Federal Geographic Data Committee Award No. 04HQAG0127. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the views of the organizations or agencies that provided support for the project.

International Standard Book Number-13 978-0-309-11030-3 (Book)

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International Standard Book Number-13 978-0-309-11031-0 (PDF)

International Standard Book Number-10 0-309-11031-9 (PDF)

Library of Congress Control Number 2007937818

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Cover: Lower half of the cover shows aerial imagery overlain with parcel boundaries provided courtesy of Delaware County, Ohio. Cover design by Michael Dudzik.

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

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