Automated H&H and Advanced Terrain Processing
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Automated H&H and Advanced Terrain Processing
Austin – Charlotte - Cary - Greensboro
Symposium on Terrain Analysis For Water Resources ApplicationsAustin, TX December 16th – 18th , 2002Joseph B. Chapman, PE, CFMSenior Vice-PresidentGray Minton, PE (not in TX)Senior Software Engineer
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Overview of Presentation
• Issues Related to Terrain Management• Overview of WISE• Terrain Processing Techniques• Automated Hydrology Functions• Automated Hydraulics Functions• Automated Floodplain Mapping
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Terrain Data and ManagementManagement of Terrain is Key to any Automated
H&H Process
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WHAT IS LIDAR?
• LIDAR = LIght Detection and Ranging• 20-25 cm RMSE Accuracy
Multiple LIDAR ReturnsTrees (canopy)Bare Earth
IF YOU DON’T KNOW THIS YOU MUST HAVE BEEN ASLEEP FOR 2 DAYS!
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How Much Data is LIDAR Data?
LIDAR Points
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How Much Data is LIDAR Data?One (1) Project Tile:•20k x 20k (14 Square Miles)•950,000 Mass Points•215 MB Shape File
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How Much Data is LIDAR Data?
1,228 Tiles in Phase I !!(4 Eastern Watersheds)
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Here’s Where We Store It!
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What is WISE?• Tool for managing and utilizing data for watershed studies• Provides integration of GIS and standard engineering calculation
programs• Modules for:
– Terrain Storage– Inventory Management– Hydrologic Analysis– Closed System Analysis– Open Channel Analysis– Water Quality Analysis– Master Planning
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WISE is Based on?
• Written in Visual Basic with a few DLL’s in C.
• Based on ESRI’s MapObjects
• Interfaces with Standard Calculation Engines
• WISE IS NOT A MODEL
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WISE Terrain Module
The Terrain module in WISE is an integrated suite of tools that:
• Imports terrain data in numerous different formats• Stores and provides quick access to very large
amounts of data• Combines terrain data based on user-assigned
priorities• Generates TIN’s and DEM’s• Hydrologically corrects the terrain data• Provides the foundation for tools in other modules such
as basin delineation and cross section takeoff
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WISE Terrain Import
• WISE allows the user to import terrain data in numerous formats, including:– LIDAR data– AutoCAD DXF’s– Numerous ASCII formats
• WISE stores all of this data in a unique storage system with unlimited storage capacity.
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WISE currently stores complete TIN for 15,000 Square miles and growing!
(4 + billion points)
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Blending of Terrain DataWISE allows the user to combine multiple different types of terrain data based on user-defined priorities
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TIN and DEM Generation
• WISE creates TIN’s from the blended terrain data
• WISE also creates DEM’s, which are later used during the hydrological correction process. These DEM’s can be exported for use in other programs such as ArcView.
• Once new Terrain data becomes available, TIN’s can be regenerated for an area without having to recreate the whole model
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Hydrological Correction• Typically the most time-consuming part of the project• WISE speeds up this process dramatically by
automatically fixing sinks, peaks, and flat areas using its own program, FAUCET
• Advantages of FAUCET– Allow for use of unlimited size data sets by tiling data– Handles negative values– Extra precision has been added (not critical for NED Data)– Doesn’t Fill Sinks! – This is important in preserving
integrity of as much of the data as possible
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Example FAUCET Correction
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Tools that use the Terrain Output
• Hydrology: Raindrop Tool, Drainage Area Tracking, Basin Delineation, Time of Concentration Calculation
• Hydraulics: Cross Section Placement, Cross Section Takeoff
• Water Quality: Spill Response Modeling
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Compatibility/Usability of Results
• Manage TIN in WISE – export to any program that accepts dxf or shapefile
• Generate a hydrologically correct DEM that can be used by any program that can except standard data formats
• Standard GIS and CADD programs do not have to store the data
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Automated Hydrology Tools
WISE has numerous tools that help a user manage and create hydrologic data including:• Automatic Basin Delineation• Automatic Time of Concentration Calculation• Curve Number Calculation• HEC-1/TR-20 model creation
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Basin DelineationWISE will allow a user to automatically delineate
basins based on a target basin size
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Time of Concentration Calculation• WISE will automatically determine the longest TC for a basin
based on longest flow length or longest flow time• WISE currently allows the user to calculate TC’s based on 5
different methods, including SCS TR-55• WISE also determines Routing Time of Concentration flowpaths,
and calculates the stage/storage curves for each routing
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Curve Number CalculationWISE will calculate Curve Numbers for a given set of basins
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Hydrologic Model CreationWISE will automatically create a complete hydrologic model for a given area
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Metadata Already Created Tracking How Model was
Created!
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Automated Hydraulic Tools
WISE has numerous tools that help a user manage and create hydraulic data including:• Automatic Cross Section Placement• Cross Section and n-value takeoff• HEC-RAS model creation• Floodplain mapping• Flood profile creation
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Automatic Cross Section Placement
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Manual Cross Section Edits
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Survey Data Import
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Feature Code Library
Standard Code Library has been used for thousands of structure surveys
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HEC-RAS Model Creation
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Floodplain Mapping
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Efficient Management of Terrain Data Make All These Other
Processes Possible
• Hydrology: Raindrop Tool, Drainage Area Tracking, Basin Delineation, Time of Concentration Calculation
• Hydraulics: Cross Section Placement, Cross Section Takeoff
• Water Quality: Spill Response Modeling
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QUESTIONS?
Austin – Charlotte - Cary - Greensboro
www.watershedconcepts.comwww.ncfloodmaps.com