NC Flood Plain LIDAR

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 TransportationPhoto
grammetry 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 TransportationPhoto
grammetry 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 TransportationPhoto
grammetry 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 1200

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_at_dot.state.nc.us)
• NCDOT Hydraulics Unit
• Mr. Dan Duffield (dduffield_at_dot.state.nc.us)
• NCDOT Visualization Group
• Mr. David Hinnant (dbhinnant_at_dot.state.nc.us)
• NCDOT GIS Unit
• Mr. Bill Miller (bmiller_at_dot.state.nc.us)