Abstract
Generalization for The National Map with Emphasis on the NHD Track: Cartography and Map Production Author(s): Lawrence Stanislawski, Michael Starbuck, Michael Finn, E. Usery The National Map (TNM), being developed by the United States Geological Survey (USGS), is created from many data sources and Web Map Services (WMS) owned by many organizations. TNM data sources are stored electronically at various scales and resolutions. Consequently, when data are extracted from several WMS and horizontally integrated in geospatial data applications, the differences between data sources become apparent. The ability to render one or more scales of TNM data into an appropriate, or functionally equivalent, representation at a user-specified scale could substantially enhance analysis capabilities of these data. This paper describes ongoing research by the USGS into automated generalization approaches that address this problem, focusing on the National Hydrography Dataset (NHD) layer of TNM. The NHD provides vector representations of surface-water features depicted at medium, high, and local resolutions, with only medium resolution currently available nationwide. Lawrence Stanislawski SAIC-USGS National Mapping Program 1400 Independence Road M/S 821 Rolla , MO 65401 US Phone: (573) 308-3914 Fax: 573 308 3652 E-mail: lstan@usgs.gov Michael Starbuck USGS Geography Discipline 1400 Independence Road Rolla , MO 65401 US Phone: 573-308-3687 Fax: 573-308-3652 E-mail: mstarbuck@usgs.gov Michael Finn USGS Geography Discipline 1400 Independence Road M/S 821 Rolla , MO 65401 US Phone: 573-308-3931 Fax: 573-308-3652 E-mail: mfinn@usgs.gov E. Usery USGS Geography Discipline 1400 Independence Road Rolla , MO 65401 US Phone: 573-308-3837 Fax: 573-308-3652 E-mail: usery@usgs.gov |
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