Understanding NHDPlus Training Series: PlusFlow Table and Tool Navigator
This content delves into understanding the format and content of the NHDPlus Training Series, specifically focusing on the PlusFlow Table and NHDPlusV2 Flow Table Navigator Tool. It explains the purpose of the tool, how it enables network traversal, and the key components of the PlusFlow Table. Additionally, it covers details like the connection between flowlines, geometric considerations, and attributes associated with the PlusFlowline VAA.
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Presentation Transcript
Understand the format and content of the PlusFlowTable Learn the mechanics of using the table to traverse the NHDPlus network. Learn how to obtain, install and use the NHDPlusV2 Flow Table Navigator Tool Objectives 1
PlusFlow Table NHDPlusV2 Flow Table Navigator Tool Agenda 2
Purpose: Enables traversal of the network (and coastline), both upstream and downstream one flowline at a time. Contains a record for every: Place where two flowlines exchange water Headwater flowline Network terminal flowline Place where a surface water flowline touches a coastline flowline Place where two coastline flowlines touch PlusFlow Table 3
FromComID FromComID ToComID ToComID Direction Direction HasGeo HasGeo GapDist GapDist Direction Domain 712 - Start Flow 709 - Flowing 713 - End Flow 714 - Non-Flowing PlusFlow Table 4
1 FromComID FromComID ToComID ToComID Direction Direction 2 Type of Connection 0 0 0 1 1 2 2 6 3 4 4 1 2 4 3 6 3 6 7 5 712 712 712 709 709 709 709 709 709 709 709 713 709 709 709 714 714 Domain 712 - Start Flow 709 - Flowing 713 - End Flow 714 - Non-Flowing 3 6 4 12 11 5 12 11 0 5 8 8 9 9 7 12 11 5 7 8 10 8 10 9 PlusFlow Table 5
HasGeo HasGeo GapDist GapDist 1 Is the Connection Geometric? Distance between From and To Flowlines Domain >= 0 2 Domain Y = Yes N = No 3 4 FromC ComID From omID ToComID ToComID HasGeo HasGeo Gap Gap Dist Dist 1 2 3 4 3 3 5 5 Y Y N N 0 0 0.5 0.5 5 PlusFlow Table 6
PlusFlowlineVAA Attributes Conveniently Joined to PlusFlow FromHydSeq ToHydSeq FromLvlPat ToLvlPat NodeNumber TotDASqKM DivDASqKM PlusFlowlineVAA.HydroSeq PlusFlowlineVAA.HydroSeq PlusFlowlineVAA.LevelPathID PlusFlowlineVAA.LevelPathID PlusFlowlineVAA.NodeNumber PlusFlowlineVAA.TotDASqKM PlusFlowlineVAA.DivDASqKM PlusFlow Table 7
Download the Navigator Install Package http://www.horizon-systems.com/NHDPlus/NHDPlusV2_tools.php Flow Table Navigator 9
Uncompress the .7z file. Run the .exe. Install: .Net ArcGIS Flow Table Navigator ToolBar Flow Table Navigator 10
Upstream Mainstem Downstream Mainstem Upstream with Tributaries Downstream with Divergences Flow Table Navigator 14
Upstream Mainstem Upstream with Tributaries Point and Click on Flowline Flow Table Navigator 16
Downstream with Divergences Downstream Mainstem Point and Click on Flowline Flow Table Navigator 17
Returns a Selected Set of Flowlines Flow Table Navigator 18
Additional information on NHDPlus is available from the NHDPlus website documentation page. You are encouraged to read and reference the NHDPlusV21 User Guide and other NHDPlus documentation. The NHDPlus team maintains a user email list and periodically sends emails regarding new tools, data, documentation, and events. If you would like to be on the user list, send an email to nhdplus-support@epa.gov The NHDPlus team also provides technical support to users of the data and tools. If you have a technical support question, please send a detailed email to nhdplus-support@epa.gov Resources 19
