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Loading Data into ArcHydro

This workshop focuses on loading data into ArcHydro and building the global geodatabase directory structure, including importing data, creating hucpoly and hucpoint features, building the global network, and assigning HydroID's.

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Loading Data into ArcHydro

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  1. Loading Data into ArcHydro Building the Global GeoDatabase

  2. Directory Structure StreamStats Data Prep Workshop Oct 21-22, 2003

  3. Global Network StreamStats Data Prep Workshop Oct 21-22, 2003

  4. Global Data Sets • All in Global.mdb geodatabase • hucpoly (tile boundaries) • streams (network to connect tiles) • hucpoints (outlets for tile polys) StreamStats Data Prep Workshop Oct 21-22, 2003

  5. Step 1: Create Empty Geodatabase StreamStats Data Prep Workshop Oct 21-22, 2003

  6. Step 2: Import data • First import a data set covering ENTIRE area, i.e. all HUCs you plan to use • This sets up the maximum spatial extent we can put into the “feature dataset” • Make sure this data set at least covers the full desired extent StreamStats Data Prep Workshop Oct 21-22, 2003

  7. The Import Coverage Tool Type in “Layers here click StreamStats Data Prep Workshop Oct 21-22, 2003

  8. Don’ttouch! click Set to areasonable value StreamStats Data Prep Workshop Oct 21-22, 2003

  9. Building Global hucpoly • Ideally no overlaps or gaps • Should be derived from fdr by delineation • Start by delineating from outlet of each HUC • Convert to a grid StreamStats Data Prep Workshop Oct 21-22, 2003

  10. Building Global hucpoly (continued) • Remove overlaps at top of non-headwaters HUCs via map algebra • Convert to a shapefile hucshp in huc folder • When finished, load shapefiles into global hucpoly feature class StreamStats Data Prep Workshop Oct 21-22, 2003

  11. Building the hucpoint feature class • These basically are the outlet points for each HUC • You need one for each HUC, including the HUC furthest downstream • Build these in ArcMap Editor StreamStats Data Prep Workshop Oct 21-22, 2003

  12. Building the Global Network • Must build a Geometric Network of streams • Just need mainstem streams needed to connect our data tiles (8-digit HUCs) • Coastal streams, and any stream not connecting an upstream HUC can be deleted StreamStats Data Prep Workshop Oct 21-22, 2003

  13. Geometric Network Wizard • Build from existing features • Use hucpoint and streams feature classes • Name network HUC_Net • Build complex edges from streams feature class • Use 2-m snap tolerance, both sets of features • Include sources and sinks on hucpoints • Do not assign weights StreamStats Data Prep Workshop Oct 21-22, 2003

  14. Set Flow Directions on Network • Select outlet hucpoint • Set Ancillary Role to Sink • Click Set Flow Direction button on Utility Network Analyst Toolbar • Or if streams from NHD, use ArcHydro Tools, set flow opposite feature directions StreamStats Data Prep Workshop Oct 21-22, 2003

  15. Assign HydroID’s StreamStats Data Prep Workshop Oct 21-22, 2003

  16. Make Relationship Class HUCHasJunction StreamStats Data Prep Workshop Oct 21-22, 2003

  17. Make Relationship Class HUCHasJunction StreamStats Data Prep Workshop Oct 21-22, 2003

  18. Store Area Outlets • ArcHydro Tools Toolbar • Attribute Tools pulldown • Or assignmanually StreamStats Data Prep Workshop Oct 21-22, 2003

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