3D NHD: Considerations and Complexities of Elevation-Derived Hydrography

With comprehensive coverage of high-resolution elevation data now available through the USGS 3DEP program and the potential for supporting funds for updating the National Hydrography Dataset, the opportunity to update statewide hydrography datasets to local scale 3D hydrography has never been better. In this presentation we will discuss some of the considerations and complexities involved in hydrologic data derivation including data specifications, landscape specific concerns, data schemas for multiple user communities, feature delineation, local stakeholder engagement, project scale, automation, conflation into the NHD, and more. The goal of this presentation is to help NSGIC members make informed decisions when planning updates to hydrography network mapping in their states.

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