U.S. Department of the Interior U.S. Geological Survey Loading Data into ArcHydro Building the Global GeoDatabase

StreamStats Data Prep Workshop Oct 21-22, 2003Page 4-2 Directory Structure

StreamStats Data Prep Workshop Oct 21-22, 2003Page 4-3 Global Network

StreamStats Data Prep Workshop Oct 21-22, 2003Page 4-4 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, 2003Page 4-5 Step 1: Create Empty Geodatabase

StreamStats Data Prep Workshop Oct 21-22, 2003Page 4-6 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, 2003Page 4-7 The Import Coverage Tool Type in “Layers here click

StreamStats Data Prep Workshop Oct 21-22, 2003Page 4-8 click Don’t touch! Set to a reasonable value

StreamStats Data Prep Workshop Oct 21-22, 2003Page 4-9 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, 2003Page 4-10 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, 2003Page 4-11 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, 2003Page 4-12 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, 2003Page 4-13 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, 2003Page 4-14 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, 2003Page 4-15 Assign HydroID’s

StreamStats Data Prep Workshop Oct 21-22, 2003Page 4-16 Make Relationship Class HUCHasJunction

StreamStats Data Prep Workshop Oct 21-22, 2003Page 4-17 Make Relationship Class HUCHasJunction

StreamStats Data Prep Workshop Oct 21-22, 2003Page 4-18 Store Area Outlets ArcHydro Tools Toolbar Attribute Tools pulldown Or assign manually