Loading Data into Arc Hydro Computing Basin Characteristics

Loading Data into Arc. Hydro Computing Basin Characteristics U. S. Department of the Interior U. S. Geological Survey

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

Aggregation of Upstream Basin Characteristics • We need methods to account for the basin characteristics of upstream HUCs. • Types of aggregation: – – – Sum (drainage area) Area-weighted average (mean slope) Maximum (Max elev) Minimum (Min elev) Relief (Max – Min elev ) Stream. Stats Data Prep Workshop Oct 21 -22, 2003 3

Basin characteristic layers • These are grids that are used to compute basin characteristics • Continuous-surface – Mean-annual precipitation – Elevation (dem) • Categorical – Forested area – Lake/pond Stream. Stats Data Prep Workshop Oct 21 -22, 2003 4

Add a new data frame (map) Stream. Stats Data Prep Workshop Oct 21 -22, 2003 5

Run Get. Parameters Stream. Stats Data Prep Workshop Oct 21 -22, 2003 6

What about adding basin characteristics? • Currently this requires programming in VB and Arc. Objects, using the APFramework • Eventually this will be streamlined so that a user can add simple characteristics in XML Stream. Stats Data Prep Workshop Oct 21 -22, 2003 7

Caveats • Make sure your basin characteristics are comparable to those that were used in the regression studies • Be wary of projection changes that may affect directional characteristics • Be wary of resolution changes that may affect basin characteristics Stream. Stats Data Prep Workshop Oct 21 -22, 2003 8