u.s. department of the interior u.s. geological survey idaho district office (208)387-1323 data...
DESCRIPTION
Flexible Approach with Standard Methods StreamStats is designed to be flexible in handling local data StreamStats will provide a set of standard definitions for basin characteristics Data must be in the ArcHydro data model, with a few extra naming requirements DEMs could be from any source or scale Users can add definitions/data as neededTRANSCRIPT
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U.S. Department of the InteriorU.S. Geological SurveyIdaho District Office(208)[email protected]
Data Requirements for StreamStats
December 18, 2002Alan Rea Peter
SteevesU.S Department of the InteriorU.S. Geological SurveyMassachusetts District Office(508)[email protected]
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National Streamstats GIS Data Components
Datasets developed for the purpose of delineating accurate basin boundaries
Datasets developed for determining basin characteristics
Fixed stations and related data Basemap datasets
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Flexible Approach with Standard Methods
StreamStats is designed to be flexible in handling local data
StreamStats will provide a set of standard definitions for basin characteristics
Data must be in the ArcHydro data model, with a few extra naming requirements
DEMs could be from any source or scale Users can add definitions/data as needed
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Base Maps
Whatever needed to locate points of interest
Primarily 1:24,000 Digital Raster Graphics (DRG)
NHD for reach-based locations Prefer National data sets
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Approaches For Developing Basin Delineation Datasets
EDNA (stage 1b) NHD Watershed preprocessing steps (
http://nhd.usgs.gov) ArcHydro ‘Terrain Preprocessing’ steps from
a DEM
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Data Requirements—ArcHydro Tools
Grids: Can be in a tiled data structure Filled DEM (fil) Flow Direction (fdr) Flow Accumulation (fac – used to create str) Streams (str)
Vectors: ArcHydro data model Catchments AdjointCatchments StreamLines
Global data sets
Globally Unique HydroID’s
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Directory Structure
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Terrain Preprocessing
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Global Data Sets All in Global.mdb geodatabase hucpoly (tile boundaries) streams (network to connect tiles) hucpoints (outlets for tile polys)
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Global Network
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Building the Global Network
Must build a Geometric Network of streams
Just need mainstem streams needed to connect our data tiles (8-digit HUCs)
Must specify a sink at outlet, compute flow directions
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Geometric Network Wizard
Build from existing features Use hucpoint and hucpoly 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
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Set Flow Directions on Network
Select outlet hucpoint Set Ancillary Role to Sink Click Set Flow Direction button on Utility
Network Analyst Toolbar
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Make Relationship Class HUCHasJunction
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Make Relationship Class HUCHasJunction
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Store Area Outlets
ArcHydro Tools Toolbar Attribute Tools pulldown
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Preprocess Basin Characteristics
ArcHydro Tools…Attribute Tools… Get Parameters
Do this for each hucpoly polygon
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Compact and Repair DataBase
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National Streamstats GIS Data Components
Datasets developed for the purpose of delineating accurate basin boundaries
Datasets developed for determining basin characteristics
Fixed stations and related data Basemap datasets
![Page 20: U.S. Department of the Interior U.S. Geological Survey Idaho District Office (208)387-1323 Data Requirements for StreamStats December 18,](https://reader036.vdocuments.us/reader036/viewer/2022062504/5a4d1b1c7f8b9ab059993a2e/html5/thumbnails/20.jpg)
Approaches For Developing Basin Delineation Datasets
EDNA (stage 1b) NHD Watershed preprocessing steps (
http://nhd.usgs.gov) ArcHydro ‘Terrain Preprocessing’ steps from
a DEM
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Why take the EDNA (stage 1b) Approach?
It is available for the project nationwide A good foundation dataset with minimal
additional processing required May be the best option for states with
limited resources
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Why take the NHD Watershed Preprocessing Approach?
Take advantage of higher quality local datasets (hi-res NHD, WBD)
Better match with primary basemap (DRGs) Horizontal union of 3 primary physiographic
datasets (elevation, basin boundaries, hydrography)
Better match with NHD and WBD for spin-off applications
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Determining the Best Option For Your State
3 National Datasets will guide States to determine best option: NHD WBD NED
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