Since my "second retirement from NSGIC" last year, I've continued to work with the Hamilton County, Indiana GIS Department (the county where I live) on the first county-level 3D Hydrography Program (3DHP) Elevation-Derived Hydrography (EDH) project in our state-and I wanted to share our results with you.
This work was completed as part of Hamilton County's 2024 Basemap Update Project and was fully aligned with both the USGS 3DEP and 3DHP programs and the County's hydrography mapping requirements. For the 3DHP component, Dewberry Engineers produced EDH from the county's new QL1 3DEP lidar and prepared it for contribution to the USGS national 3DHP database. To meet our county requirements, they also integrated the new EDH data with our local government storm sewer networks, regulated drains, and developed new AI/ML-based wetlands predictive modeling/mapping layers. When the project wraps up next month, the county will also share these datasets with the Indiana Geographic Information Council (IGIC) Waters Workgroup and the Indiana Geographic Information Office (IGIO) to help inform their development of a statewide 3DHP plan.
Earlier this week Hamilton County hosted a 3DHP – EDH 101 technical workshop for local and state partners who will begin seeing and using this new data next month on the County's GeoHUB. Presentation materials are available below:
I'm very excited about our results and hope you find this information timely and useful!
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Philip Worrall
Retired
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