Kentucky Transportation Center

Transcription

1 Kentucky Transportation Center Research Report KTC /FRT F Utilization of Mobile LIDAR to Verify Bridge Clearance Heights on the Western Kentucky Parkway

2 Our Mission We provide services to the transportation community through research, technology transfer and education. We create and participate in partnerships to promote safe and effective transportation systems University of Kentucky, Kentucky Transportation Center Information may not be used, reproduced, or republished without our written consent. Kentucky Transportation Center 176 Oliver H. Raymond Building Lexington, KY (859) fax (859)

3 1. Report No. KTC FRT F 2. Government Accession No. 3. Recipient s Catalog No. 4. Title and Subtitle Utilization of Mobile LIDAR to verify Bridge Clearance Heights on the Western Kentucky Parkway 5. Report Date August Performing Organization Code 8. Performing Organization Report No. KTC FRT F 7. Authors Brad W. Rister P.E. Levi McIntosh Engineering Tech II Joe Whelan E.I.T. 9. Performing Organization Name and Address University of Kentucky College of Engineering Kentucky Transportation Center 176 Oliver Raymond Building Lexington, KY Sponsoring Agency Name and Address Kentucky Transportation Cabinet 200 Mero Street Frankfort, KY Work Unit No. (TRIAS) 11. Contract or Grant No. KTC FRT F 13. Type of Report and Period Covered Final 14.Sponsoring Agency Code 15. Supplementary Notes Prepared in cooperation with the Federal Highway Administration, US Department of Transportation, and the Kentucky Transportation Cabinet 16. Abstract Bridge clearances can vary from lane-to-lane beneath overpasses, and can often be difficult to measure due to high traffic volumes. Therefore, a mobile LiDAR unit was utilized in this project to obtain the bridge clearance heights on the Western Kentucky Parkway. The LiDAR information was collected at 400,000 points-per-second at a driving speed of 30 mph. Hand measurements were also taken on each bridge to assist in quantifying the potential error between field measurements and LiDAR measurements. The results of the collected LiDAR data appear to be less than 1.2 inches, which appears to be in line with both manufactures and industry standards. 17. Key Words LiDAR, Bridge Clearance Heights, Mobile LiDAR 19. Security Classification (of this report) Unclassified Form DOT (8-72) 20. Security Classification (of this page) Unclassified 18. Distribution Statement Unlimited, with approval of the Kentucky Transportation Cabinet 21. No. of Pages 50 Reproduction of completed page authorized 22. Price

4 TABLE OF CONTENTS I. INTRODUCTION II. METHODOLOGY III. CONCLUSIONS APPENDIX A: Bridge Clearance Height Templates and Data Verification

5 I. Introduction Bridge clearance heights often vary between the roadway surface and the bottom of the bridge superstructure above the roadway. Often the original clearance heights are jeopardized after multiple resurfacing projects. Opportunities to measure the bridge clearance heights become difficult to determine in urban areas because of limited access to manually measure the heights by conventional methods. Therefore, the Kentucky Transportation Center has used mobile LiDAR technology to determine bridge clearance heights on the Western Kentucky Parkway. The collected LiDAR data has been processed and distributed to the Kentucky Transportation Cabinet in the form of vertical clearance templates for each overpass (Appendix A). This information can be used for routing super loads and/or verifying FHWA standards for highway overpass clearances. II. Methodology In an effort to aid the Kentucky Transportation Cabinet, Bridge Preservation Program, the Kentucky Transportation Center has used an Optech Lynx Mobile Mapping LiDAR system to scan the bridge clearance heights on the Western Kentucky Parkway and Interstate 69. In efforts to compliment the LiDAR data, hand measurements were taken in the field using a laser measuring device and a level rod. Upon completion of the LiDAR processing, KTC has determined that an approximate accuracy of +/- 1.2 inches between the LiDAR measurements and hand verifications has been achieved. To support our findings, KTC has found that Utah DOT has performed similar projects utilizing mobile LiDAR technology. They state the following: Early efforts appear promising, with indications of getting to an average accuracy level of +/- 3 cm" 1. or +/ inches with over 6000 miles of roadway scanned. Optech, the equipment manufacturer, lists an accuracy of +/- 5 cm or +/ inches. 2 Therefore, KTC believes its accuracies are within industry standards. III. Conclusions The Kentucky Transportation Center has completed the LiDAR data collection and processing on the Western Kentucky Parkway and Interstate 69. Upon reviewing the collected LiDAR data and hand verifications KTC believes its approximate accuracies are within +/- 1.2 inches and within industry standards for similar studies. 1. Ellsworth, Phil. "Utah DOT Leveraging LiDAR for Asset Management Leap.". UDOT, n.d. Web. 7 Aug < 2.

6 Western Kentucky Parkway Bridge Heights US-31W By-Pass 2 New Route 3 KY KY KY KY-84 7 Rock Creek Rd. 8 Clifty Church Rd. 9 KY Crow Hollow Rd. 11 KY KY KY KY McDonald Rd. 16 Higgs Rd. 17 KY KY KY Dog Creek Rd. 21 KY KY KY KY R.R. Crossing 26 KY KY KY Monsanto Haul Rd. 30 KY US KY KY Henry Oates Rd. 35 KY KY KY KY KY Lewistown Church Rd. 41 KY KY KY KY

7 US-31W By-Pass 047B00153R 136 Stringer/Multi-Beam or Girder Pre-Stressed Concrete Continuous

8 New Route

9 KY B00090N 132 Tee-Beam Concrete Continuos

10 KY B00045n 129 Tee-Beam Concrete Continuous

11 KY B00085N 127 Tee-Beam Concrete Continuous

12 KY B00043N 123 Tee-Beam Concrete Continuous

13 Rock Creek Rd. 047B00168N

14 Clifty Church Rd. 043B00104N 119 Tee Beam Concrete Continuous

15 KY B00078N 117 Tee-Beam Concrete Continuous

16 Crow Hollow Rd. 043B00095N 114 Box Beam or Girders - Multiple Prestressed Concrete

17 KY B00003N 112 Tee-Beam Concrete Continuous

18 KY B00099N 111 Box Beams or Girders - Multiple Prestressed Concrete

19 KY B00060N 109 Tee-Beam Concrete Continuous

20 KY B00098N 107 Stringer/Multi-Beam or Girder Pre-Stressed Concrete

21 McDonald Rd. 043B00073N 106 Tee-Beam Concrete Continuous

22 Higgs Rd. 043B00096N 96.6 Box Beam or Girder - Single or Spread Prestressed Concrete

23 KY B00097N 95.2 Box Beam or Girder - Multiple Pre-Stressed Concrete

24 KY B00023N 94.3 Tee-Beam Concrete Continuous

25 KY B00094N 92.3 Box Beam or Girder - Single or Spread Pre-Stressed Concrete Continuous

26 Dog Creek Rd. 043B00082N 90.6 Tee-Beam Concrete

27 KY B00034N 87.8 Tee-Beam Concrete Continuous

28 KY B00093N 82.1 Tee-Beam Concrete

29 KY B00136N 77.4 Tee-Beam Concrete

30 KY B00112N 68.7 Tee-Beam Concrete

31 R.R. Crossing 68.5 Steel

32 KY B00108N 67.4 Tee-Beam Concrete

33 KY B00059N 64.9 Tee-Beam Concrete

34 KY B00058N 61.9 Tee Beam Concrete

35 Monsanto Haul rd. 089X00905N 61.4 Stringer/Multi-Beam or Girder Steel

36 KY B00133N 58.3 Box Beam or Girder Prestressed Concrete

37 US B00132R 57.9 Box Beam or Girder Prestressed Concrete

38 KY B00131N 57.1 Box Beam or Girder Prestressed Concrete

39 KY B00130N 50.3 Box Beam or Girder Prestressed Concrete

40 Henry Oates Rd. 089B00085N 44.8 Tee Beam Concrete Continuous

41 KY B00131N 38.7 Tee-Beam Concrete Continuous

42 KY B00117N 99.6 Tee-Beam Concrete Continuos

43 KY B00070N 92.5 Tee Beam Concrete Continuous

44 KY B00048N 89 Tee-Beam Concrete

45 KY B00061N 86.7 Tee-Beam Concrete

46 Lewistown Church Rd. 017B00060N 85.4 Tee-Beam Concrete Continuous

47 KY B00007N 81.2 Tee Beam Concrete Continuous

48 KY B00037N 79.7 Tee Beam Concrete Continuous

49 KY B00029N 73.7 Tee Beam Concrete Continuous

50 KY B00050N 68.9 Tee-Beam Concrete Continuous

51 Western Kentucky Parkway Field Measurements vs. Lidar Measurements Location East to West WB Verification EB Verification Lidar Lidar Num ber MP Carries Survey rod measure 7/25/13 (ft) Measurement (ft) Absolute Difference (ft) Survey Rod Measure 7/25/13 (ft) Measurement (ft) Absolute Difference (ft) 31W Bypass New Route KY KY S. Long Grove Rd. (Ky-1375) KY Rock Creek RD Clifty church rd KY CROW HOLLOW RD KY KY KY KY MCDONAL D RD HIGGS RD KY KY KY DOG CREEK RD KY

52 KY KY KY RR Crossing KY KY KY MONSANT O HAUL RD KY US KY KY Henry Oates Rd KY Begin I KY KY KY KY Lewistown Church Rd KY KY KY KY Average Difference (ft) Average Difference (ft)