NHD Tools

• tar.exe
• gzip.exe

\utils\gzip (gzip parameters)

C:\ gzip -d 02040301.tgz

C:\ tar xvf 02040301.tar    OR    C:\tar xvf 02040301.arc.tar

C:\ tar cvf 02040301.tar 02040301

C:\ gzip 02040301.tar

C:\ gzip -dc 02040301.tgz | tar xvf -

• It is recommended that users intending to submit NHD updates to USGS, work with individual subbasins rather than appended subbasins. See the Maintenance section for information on user-submitted NHD updates. Be aware that editing individual subbasins can introduce inconsistencies that cause subsequent attempts to append the subbasins to fail.
  
  
• Append_NHD can append sets of initial release NHDinARC data or sets of flow validated NHDinARC data, but not mixtures of the two.
  
  
• Append_NHD makes copies of all input NHDinARC workspaces during processing. Therefore, storage space equal to at least three times the size of the input NHDinARC workspaces is required for Append_NHD to run.

• append_nhd227.tgz

1. Save the installation file on your hard drive
2. Uncompress and untar the file (see PC-compatible compression tools)
3. Start Arc/Info
4. Set an AMLPATH ($AMLPATH command) to the directory containing the Append_NHD programs or copy the programs to the location on your computer where customized AML applications are stored.

• NHDGEOinARC workspaces are complex, containing multiple coverages and feature classes, several related tables, and metadata. Append_NHDGIA properly integrates these components from the input workspaces into the output workspace.
• Adjacent NHDGEOinARC workspaces contain duplicate features. This occurs most frequently when areal stream/river features touch subbasin boundaries. In most cases, the stream/river features will exist in both of the workspaces. Append_NHDGIA detects and properly resolves duplicate features leaving only a single instance of each feature.
• Adjacent NHDGEOinARC workspaces contain complex geometry/feature relationships. As a result, there are cases where more than one feature (e.g. a linear dam/weir and a linear non-earthen shore) co-exist on the same spatial primitive (e.g. arc). To re-create topological relationships in output workspaces, an ARC/INFO CLEAN (tolerance = .02 meters) is run on the appended NHD data. Append_NHDGIA resolves problems in the data caused by CLEAN by restoring features that may have been lost during the CLEAN process.

• It is recommended that users intending to submit NHD updates to USGS work with individual subbasins rather than appended subbasins. See the Maintenance section for information on user-submitted NHD updates. Be aware that editing individual subbasins can introduce inconsistencies that cause subsequent attempts to append the subbasins to fail.
  
  
• Append_NHDGIA can append sets of NHDGEOinARC data, but not NHDinGEO data. A special tool to append NHDinGEO data is not available at this time. Use Append_NHD to append NHDinARC data.
  
  
• Append_NHDGIA makes copies of all input NHDGEOinARC workspaces during processing. Therefore, storage space equal to at least three times the size of the input NHDGEOinARC workspaces is required for Append_NHDGIA to run.
  
  

Downloading and Installing:

Download the Append_NHDGIA installation file (104k)

• append_nhdgia13

1. Save the installation file on your hard drive
2. Uncompress and untar the file (see PC-compatible compression tools)
3. Start Arc/Info
4. Set an AMLPATH ($AMLPATH command) to the directory containing the Append_NHD programs or copy the programs to the location on your computer where customized AML applications are stored.
   

• nhdtoolkit 7_0_0.exe

1. Save the installation file to your PC's hard drive
2. Using the Windows' RUN command, execute nhdtoolkit7_0_0.exe to perform the installation.

• NHD Load/Unload Workspace
  
  
  Current Version: 1.2.4
  
  Software Environment: ArcView extension programmed in Avenue
  
  Purpose: NHD Load/Unload Workspace is designed to assist users in viewing NHD data. It loads themes and tables into the active View and builds links between the themes and tables based on the NHD schema. Multiple NHD workspaces can be loaded. Workspaces can be in Arc/Info coverage format (NHDinARC) or shapefile format (NHDinSHP). NHD Load/Unload Workspace can also be used to load appended workspaces. When a workspace is loaded, the user has control of which themes and tables are loaded and which links are established.
  
  Using NHD Load/Unload Workspace: Click on the ArcView HELP button, then click on the 'NHD Load/Unload Workspace Help' item to display on-line help for NHD Load/Unload Workspace.
  
  
• NHD Navigate
  
  
  Current Version: 1.1.8
  
  Software Environment: ArcView extension programmed in Avenue and C++
  
  Purpose: NHD Navigate is designed to assist users in traversing the NHD drainage network through the use of the NHD reach flow relationships. Using Navigate, the user may select a starting point for the navigation which is either a reach or a point along a reach. At the user's option, the navigation proceeds either upstream along the mainstem or upstream along all flow paths or downstream along the mainstem or downstream including all divergent flow paths. Other navigation options include the selection of a maximum distance to travel or the selection of a particular stopping point along the network. NHD Navigate displays the navigation results as a new theme which is added to the active view.
  
  Using NHD Navigate: Click on the ArcView HELP button, then click on the 'NHD Navigate Help' item to display on-line help for NHD Navigate.
  
  
• NHD Reach Indexing Tool (RIT)
  
  
  Current Version: 3.1.0
  
  Software Environment: ArcView extension programmed in Avenue
  
  Purpose: The NHD RIT is a tool for associating surface water entities, like trout waters or use-impaired waters, with the NHD by creating reach addresses for these entities. The NHD RIT uses ESRI�s dynamic segmentation model to build event tables which store information about the NHD reaches that define the location of each entity. This approach allows the user to easily link and map surface water attributes without editing the underlying NHD coverage.
  
  Using NHD Reach Indexing Tool: Click on the ArcView HELP button, then click on the 'NHD RIT Help' item to display on-line help for NHD RIT. For more information about georeferencing surface water information to the NHD visit EPA's georeferencing Web site. You can also download the NHD RIT User Guide and Tutorial from this EPA site.
  
  
• NHD Migrate
  
  
  Current Version: 1.0.0b12
  
  Software Environment: ArcView extension programmed in Avenue and C++
  
  Purpose: NHD Migrate is designed to provide National Hydrography Dataset (NHD) users with an easy to use tool for migrating tables of point, linear, and areal events to NHD data that has been updated. NHD Migrate is optimized for moving events between NHD of the same version (e.g. from medium resolution NHD to medium resolution), however, it can be used to move from medium resolution NHD to high resolution NHD. When moving from medium to high resolution, especially, there are some cases where the events will not move to the desired location on the reach, however the NHD Migrate QA/QC features will assist the user in locating events that may need adjustment. Future enhancements are planned that will improve the migration from medium resolution to high resolution.
  
  Using NHD Migrate: Click on the ArcView HELP button, then click on the 'NHD Migrate Help' item to display on-line help for NHD Migrate.
  
  
• NHD Arc2Shape
  
  
  Current Version: 1.1.2
  
  Software Environment: ArcView extension programmed in Avenue
  
  Purpose: NHD Arc2Shape converts NHDinARC coverages and associated INFO files to NHDinSHP shapefiles and .DBF files, respectively. Reach feature classes and linear landmark feature classes in NHDinARC workspaces become measured shapes in NHDinSHP workspaces. NHD Arc2Shape is intended for ArcView users who may be more comfortable operating with shapefile formatted data rather than coverage formatted data. In addition, shapefiles generally display faster in ArcView than coverage-based feature classes (especially, measured shapes converted from coverage-based route systems).
  
  Important Details:
  • Individual or appended (using Append_NHD) NHDinARC workspaces can be converted.
  • Only updates to NHDinARC workspaces - not NHDinSHP workspaces -- can be taken back by USGS for incorporation into the central NHD. Reference the Maintenance section for information on user-submitted NHD updates.
  • NHD Arc2Shape will project NHDinARC data to the current View projection if requested by the user.
  
  
  Using NHD Arc2Shape: Click on the ArcView HELP button, then click on the 'NHD Arc2Shape Help' item to display on-line help for NHD Arc2Shape.
  
  

• NHDGEOSHPToolkit2_0_0b5.EXE

1. Save the installation file to your PC's hard drive.
2. Using the Windows' RUN command, execute NHDGEOSHPToolkit2_0_0b5.EXE to perform the installation.

• NHDGEOSHP Load/Unload Workspace
  
  
  Current Version: 1.0.0b8
  
  Software Environment: ArcView extension programmed in Avenue
  
  Purpose: NHDGEOSHP Load/Unload Workspace is designed to assist users in viewing NHD data. It loads themes and tables into the active View and builds links between the themes and tables based on the NHDGEOinSHP data model. Multiple NHDGEOinSHP workspaces can be loaded. When a workspace is loaded, the user has control of which themes and tables are loaded and which links are established.
  
  Using NHDGEOSHP Load/Unload Workspace: Click on the ArcView HELP button, then click on the 'NHDGEOSHP Load/Unload Workspace Help' item to display on-line help for NHDGEOSHP Load/Unload Workspace.
  
  
• NHDGEOSHP Navigate
  
  
  Current Version: 2.0.0b1
  
  Software Environment: ArcView extension programmed in Avenue and C++
  
  Purpose: NHDGEOSHP Navigate is designed to assist users in traversing the NHD drainage network through the use of the NHD reach flow relationships. Using Navigate, the user may select a start drain or point on a start drain for the navigation. At the user's option, the navigation proceeds either upstream along the mainstem or upstream along all flow paths or downstream along the mainstem or downstream including all divergent flow paths. Optionally, the user may specify a stopping distance. NHDGEOSHP Navigate displays the navigation results as an event table displayed via the linear reaches theme.
  
  Using NHDGEOSHP Navigate: Click on the ArcView HELP button, then click on the 'NHDGEOSHP Navigate Help' item to display on-line help for NHDGEOSHP Navigate.
  
  
• NHDGEOSHP Project Utility
  
  
  Current Version: 1.0.0b1
  
  Software Environment: ArcView extension programmed in Avenue
  
  Purpose: The NHDGEOSHP Project Utility provides a convenient method for projecting all the themes of an NHDGEOinSHP workspace.
  
  Using NHDGEOSHP Project Utility: Click on the ArcView HELP button, then click on the 'NHDGEOSHP Project Utility Help' item to display on-line help for NHDGEOSHP Project Utility.
  
  
• NHDGEOSHP Reach Indexing Tool (RIT)
  
  
  Current Version: 1.1.2
  
  Software Environment: ArcView extension programmed in Avenue
  
  Purpose: The NHDGEOSHP RIT is a tool for associating surface water entities, like trout waters or use-impaired waters, with the NHDGEOinSHP by creating reach addresses for these entities. The NHDGEOSHP RIT uses ESRI's dynamic segmentation model to build event tables which store information about the NHD reaches that define the location of each entity. This approach allows the user to easily link and map surface water attributes without editing the underlying NHDGEOinSHP coverage.
  
  Using NHDGEOSHP Reach Indexing Tool: Click on the ArcView HELP button, then click on the 'NHDGEOSHP RIT Help' item to display on-line help for NHDGEOSHP RIT. For more information about georeferencing surface water information to the NHD visit EPA's georeferencing Web site.
  
  

• Network_PGDB_S0_FL.exe
  
  To install NHD Network Builder on a PC:
  
  Copy Network_PGDB_S0_FL.exe executable to your hard drive. This need not be the directory containing the NHDinGEO data.