United States Department of Transportation
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Stream & Wetland Mitigation Forecasting: Developing a Predictive Model for Faster Project Delivery and Cost-Savings
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2022-06-01
[PDF-15.02 MB]
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Edition:Final Report
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Abstract:Wetlands and streams provide significant ecological and societal services. Accurate mapping of their locations is necessary for ODOT to plan for avoidance or mitigation efforts and costs. The National Wetland Inventory (NWI) provides the best nationwide spatial database of wetlands, but the database has not been updated for up to four decades and misses many smaller, vegetated wetlands. To address these problems, we developed a method for identifying wetlands and stream channels from publicly accessible data including aerial images and lidar point clouds. We applied both image classification and terrain analysis to identify potential wetlands and streams in five test watersheds across Ohio. Overall accuracy of the method ranged from 64.5% to 85.6% when compared to known points and decreased with increasing watershed size. With an overlay of project data, we identified potential ODOT projects over the next four fiscal years that could impact nearby streams or wetlands.
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Content Notes:Supporting file includes a user manual for Ohio Wetland Classification and Channel Extraction.
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