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NC Flood Plain LIDAR Use at NCDOT August 4, 2004 NC LIDAR Workgroup NCSU

North Carolina Department of Transportation. NC Flood Plain LIDAR Use at NCDOT August 4, 2004 NC LIDAR Workgroup NCSU. North Carolina Department of Transportation Experience with LIDAR Elevation Data. NCDOT Photogrammetry Unit NCDOT Hydraulics Unit NCDOT Visualization Group

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NC Flood Plain LIDAR Use at NCDOT August 4, 2004 NC LIDAR Workgroup NCSU

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  1. North Carolina Department of Transportation NC Flood Plain LIDAR Use at NCDOT August 4, 2004 NC LIDAR Workgroup NCSU

  2. North Carolina Department of TransportationExperience with LIDAR Elevation Data • NCDOT Photogrammetry Unit • NCDOT Hydraulics Unit • NCDOT Visualization Group • NCDOT GIS Unit • Contact Information

  3. North Carolina Department of TransportationPhotogrammetry Unit • 2000 - 2001: USDOT funded Technology Application Project with EarthData • Documented accuracy and demonstrated potential for LIDAR elevation data in transportation projects • Initial indication of computer technology related issues • 2002: Utilized NC Flood Plain LIDAR for 20 projects • Validated accuracy and evaluated provided data for application to standard mapping products • Developed Implementation Plan • 2003: Utilized NC Flood Plain LIDAR for 30 projects • Continued with Implementation Plan • 2004: Anticipate Using NC Flood Plain LIDAR for 80 projects • Now providing LIDAR elevation data to other NCDOT customers

  4. North Carolina Department of TransportationPhotogrammetry Unit • Implementation Plan • Acquire 20 Foot Gridded LIDAR Elevation Data from NCFMP - currently have Phase I and waiting for release of Phase II • Implemented a Program to Host, Access, & Reformat 20 Foot Gridded Data to MicroStation DGN Format on NCDOT Photogrammetry Server for Internal Customers • Utilize 20 Foot Gridded LIDAR Elevation Data for Orthorectification, Planning, and Functional and Preliminary Design Mapping Products • Continue to Add Photogrammetric Breaklines to 20 Foot Gridded LIDAR Elevation Data to Produce DTM Data for Functional and Preliminary Design • Will not Utilize NCFMP LIDAR Elevation Data for Final Design DTM Data or Construction Earthwork Pay Quantity Calculations

  5. North Carolina Department of TransportationPhotogrammetry Unit • Mapping Products that Utilize NC Flood Plain LIDAR • Digital Mosaic - used for corridor planning and environmental document • LIDAR used for orthorectification • Orthophotography - used for corridor evaluation and selection • LIDAR included as part of terrain data with limited photogrammetric breaklines • LIDAR used for orthorectification • Topographic Mapping - used to establish project footprint and is often base map for Design Public Hearing • LIDAR included as part of terrain data with extensive photogrammetric breaklines • Typical Scale is 1”=200’

  6. North Carolina Department of TransportationHydraulics Unit • 2003 - 2004: Utilized NC Flood Plain LIDAR to clarify and resolve drainage and flooding disputes nearby NCDOT Projects • Disputes can arise during or post construction • Have used NC Flood Plain LIDAR for a few projects to date • NC Flood Plain LIDAR provided by Photogrammetry Unit

  7. North Carolina Department of TransportationVisualization Group • 2003 - 2004: Utilized NC Flood Plain LIDAR for terrain and model surface for image rendering • Have used NC Flood Plain LIDAR for a few projects to date • NC Flood Plain LIDAR proved by Photogrammetry Unit or obtained directly from NCEM • Sample Rendered Images from Wilmington, NC (Image and building footprints from local governments)

  8. North Carolina Department of TransportationVisualization Group

  9. North Carolina Department of TransportationVisualization Group

  10. North Carolina Department of TransportationGIS Unit • 2002 - 2004: Developed and maintaining database and program to retrieve 20 foot gridded LIDAR for use by Photogrammetry Unit (DGN file) • 2004: Developing a web site that provides contours or gridded LIDAR for an entire county (output available as State Plane Feet in shapefile or DGN file) • currently utilizes NC Flood Plain LIDAR and USGS DEM data • 2004: Developing program to use raw LIDAR data to determine building heights for NCDOT Visualization Group projects

  11. North Carolina Department of TransportationContact Information • NCDOT Photogrammetry Unit • Mr. Keith Johnston (kjohnston@dot.state.nc.us) • NCDOT Hydraulics Unit • Mr. Dan Duffield (dduffield@dot.state.nc.us) • NCDOT Visualization Group • Mr. David Hinnant (dbhinnant@dot.state.nc.us) • NCDOT GIS Unit • Mr. Bill Miller (bmiller@dot.state.nc.us)

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