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Minnesota DOT Experiences in Testing Spatial Sensing Technologies.

MIKE LEEGARD, P.E. Photogrammetric Engineer. Office of Land Management. Minnesota Department of Transportation. Minnesota DOT Experiences in Testing Spatial Sensing Technologies. MR-RST technology exchange meeting. April 14-15, 2003. LIDAR Provides a Surface Model (elevations). LI = LIGHT.

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Minnesota DOT Experiences in Testing Spatial Sensing Technologies.

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  1. MIKE LEEGARD, P.E. Photogrammetric Engineer Office of Land Management Minnesota Department of Transportation Minnesota DOT Experiences in Testing Spatial Sensing Technologies. MR-RST technology exchange meeting. April 14-15, 2003

  2. LIDAR Provides a Surface Model (elevations)

  3. LI = LIGHT D = DETECTION A = and R = RANGING LIDAR Similar to RADAR except LIDAR utilizes light in lieu of Radio waves….

  4. Bare Ground/Canopy Source: Spencer B. Gross

  5. Ground Elevation Model –Detroit Lakes Source: Horizons, Inc.

  6. LIDAR super-imposed on image

  7. Canopy Penetration Source: Horizons, Inc.

  8. Introduction • 25 projects flown using LIDAR • Flight Height 7000’ above ground level • Swath angle 35 degrees • Shot spacing of 4’ to 14’ on ground

  9. Costs • Cost per acre for projects without breaklines added was $1.77 to $10.08. • Cost per acre for projects with breaklines added was $3.29 to $10.28. • Cost stated above may have also include orthophoto production). • Project size ranged from 670 acres to 36,118 acres. • LIDAR project costs are greatly affected by size, location, terrain, land cover, manual editing - thinning and (ultimately) required DEM accuracy.

  10. LIDAR super-imposed on image

  11. Filtered Data Thinned Data

  12. Preliminary Testing • Some projects had detailed design mapping previously done in parts of the LIDAR coverage area. • Two foot contours were generated from the detailed design TIN models and those produced from the LIDAR. • The contours were overlaid on each other

  13. Image with stereoplotter contours

  14. White – Stereoplotter contoursRed – LIDAR contours

  15. LIDAR Comparison of 2’ contoursWhite - StereoplotterRed – LIDAR

  16. LIDAR Comparison of 2’ contoursWhite - StereoplotterRed - LIDAR

  17. Testing Procedure • Requested district Surveys to obtain 20-25 random x,y, & z coordinates in each of 5 ground cover types. • Survey elevations were compared to elevations generated from the TIN model made from the LIDAR data.

  18. http://www.mnplan.state.mn.us/pdf/1999/lmic/nssda_o.pdf

  19. NSSDA reports spatial accuracies at a 95% confidence level.

  20. Open Hard Surface OHS Range: –0.29’ to +1.73’ Ave NSSDA: 1.37’

  21. Open Soft Surface OSS Range: –1.63’ to +1.42’ Ave NSSDA: 0.92’

  22. Low Ground Cover LGC Range: –4.43’ to +0.72’ Ave NSSDA: 1.40’

  23. High Ground Cover HGC Range: –4.13’ to +2.49’ Ave NSSDA: 1.54’

  24. Dense Ground Cover DGC Range: –3.12’ to +2.25’ Ave NSSDA: 1.73’

  25. http://www.airbornelasermapping.com/

  26. I will post my presentation here……… http://rocky.dot.state.mn.us/Inside_LM/Photogrammetrics/Presentations/presentations.html

  27. For City, Township and County Folks… “Remember, you may hire a contractor under the umbrella of a State Contract….”

  28. Cory Leegard fishing on Tulaby Lake, 12-31-2002… THANKS FOR YOUR TIME…. QUESTIONS????

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