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Abstract
Keeping Linear References In-Sync with the National Hydrography Dataset
Track: Water Resources
Author(s): Cindy McKay
The National Hydrography Dataset (NHD) is designed to be a framework for linear referencing of water resources information. In this context, linear referencing is the act of associating attributes to points or stretches along the stream network through an addressing scheme imposed upon the network. An important consideration in linear referencing is the maintenance of the references as the underlying stream framework changes. In two decades, users of the EPA Reach Files have tied many different types of attributes to reaches. These attributes must now be moved to the NHD. As the NHD changes, the links between these attributes and the NHD will need to change as well. This paper addresses the technical aspects of migrating linear references and some of the tools that have been recently built for this purpose.
Cindy McKay
Horizon Systems Corporation
482 Montalto Drive, Suite 100
Herndon, VA 20170
USA
Phone: 703-471-0480
Fax: 703-742-3965
E-mail: ldm@horizon-systems.com