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The following tools are provided to assist in the use of NHD data. Any
problems encountered when using these tools should be reported to nhd@usgs.gov.
- USFS Reprojection Tool Version 2.0 - The USFS Reprojection Toolbar changes geographic projection and can transform datums using all available ESRI ArcObjects algorithms. It was developed by the U.S.D.A.-Forest Service for the National Hydrography Dataset (NHD) NHDinGEO format, but can function on any personal or file geodatabase. This is an add-on toolbar written for ESRI's ArcGIS 9.2 and 9.3. The advantage is that it reprojects whole personal and file geodatabases at once, and updates the metadata at both the Geodatabase, Dataset, and Feature class levels in both the Data Quality and Spatial Reference sections of standard FGDC metadata--or creates its own metadata if there is none. Version 2.0 works on ArcGIS 9.2 while version 2.1 works on ArcGIS 9.3.
- Hydrography Event Management Tool - The Hydrography Event Management (HEM) Tool provides full functionality for adding and editing events in the NHD. Events are informational data that are linked to the NHD using a linear referencing system on NHDFlowlines. The use of events is a key characteristic of the NHD by allowing vast amounts of scientific information to be linked to the NHD while keeping the design simple and by making advanced analysis techniques possible. The HEM tool handles all the linear referencing mechanics to make working with events easy. It works on point, line, and area events and allows events to be located interactively, imported, or calculated. An I.D. value is created that provides the link between the event location and the informational data tied to the location. It also creates metadata linked to the event. The tool also provides network measuring to determine distances through the flowline network. The HEM tool was developed by the Department of the Interior - Bureau of Land Management.
- NHD Network Builder - After reprojecting NHDinGEO data, it is necessary to re-build the network(s) to restore flow and directionality to your network data. Network_PGDB_S0_FL.exe is a tool that rebuilds a network and sets the flow direction within the context of the geometric network based on the flowdir attribute. The tool does not rebuild or update the NHDFlow table.
- Geographic Names Information System (GNIS)
- Access GNIS to check, submit new, or make changes to names in GNIS.
Disclaimers: |
U.S. Department of the Interior | U.S. Geological Survey