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ESRI SERUG Conference 2008
Using GIS Tools to Develop Preliminary Highway Corridors
Carl Furney, GISPAndy Belcher
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IntroductionUS 17 Corridor Project
New Location Roadway
Environmentally Sensitive
75 Mile Study Area
Developing Area
Multiple Alternatives
Multiple Agency Input
Solution: ESRI ArcGIS SoftwareSpatial Analyst Tools
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Project BackgroundThe National Environmental Policy Act (NEPA) requires federal agencies to integrate
environmental values into their decision making processes by considering the environmental impacts of their proposed actions and reasonable alternatives to those actions. To meet this requirement, federal agencies prepare a detailed statement known as an Environmental Impact Statement (EIS).
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Project Plan
MethodologyCollect Data for Study Area
Weigh and Overlay Data
Convert to Raster
Generate Suitability Surfaces
Run Least Cost Paths and Corridors
Roadway Design
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Natural Environment
Wetlands Natural Heritage
Streams
Floodplains
Endangered Species
Surface Water
Topography *
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Human Environment
Schools
Recreation (Parks)
Churches
Other Features
Cemetery Residential
Golf Course Community
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Layer Weighting
7Areas Where Environmental Features Overlay to Equal a Total Weight/Score > 6
1Land Not Affected by Natural Environment Features
6500’ Buffer Along Existing US 17
2Water Boundaries(4)
2100 – year floodplains(4)
6Nature Preserves and Registered Heritage Areas(3)
6Managed Areas(3)
6Anadromous Fish Spawning Areas(2)
6Significant Natural Heritage Areas(3)
63
Natural Heritage Occurrences (buffered points) (3)
-All Federal Endangered Species, ¼ mile buffer-Red Cockaded Woodpecker, ½ mile buffer
6High Quality Water Zones(2)
62-5 (depending on type)
Division of Coastal Management Wetlands(1)
-Pristine-Non-Pristine
Weight/ScoreLayer
7Areas Where Human Features Overlay to Equal a Total Weight/Score > 6(2)
1Vacant
6500’ Buffer Along Existing US 17
1Limited Land Use > 50 Acres(1)
3Power Line Easement
2Transportation/General Utilities/R-O-W
3Water (Entire Parcel)
654
Residential-Less than 5 Acres-Platted Subdivision Lot, Vacant Less than 5 Acres-Greater than 5 Acres
65
Recreation-Public-Private
54
Commercial-Office-Industrial -Less than 50 Acres-Greater than 50 Acres
6
Emergency Management-Police Station-Fire Station-EMS Station-Medical Facility
6
Government-Post Office-Blueberry Research Station-Federal Aviation Administration Radar Facility-Department of Motor Vehicles
6
Community Features-Cemetery-Church-Day Care Center-Historic Property-School
Weight/ScoreLayer
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Suitability Layers
Vector 250’ Grid Representation
Weighted Overlay
Reclassify
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Suitability Layers
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TerminiMultiple Project Termini
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Least Cost PathsLeast Cost Paths
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CorridorsCorridors
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Corridor ModelCorridor Model: Allowed Multiple Scenarios
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Output and DesignOutput Delivered to Roadway Design Staff
Curve RadiusIntersecting Roadways
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Overview
ArcReader Demo
& Discussion
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Output and Design
Questions