1、HIGH DEFINITION SU RVEYS-HDS I Terrestrial Scanning A Proven Technology AASHTOs Technology Implementation Group http:llwww.aashtotg.org SAFETY SR 322 Mt Pleasant, PA On the SR 322 project, a 30 percent reduction in survey labor costs and improved accuracy was achieved. Equally important, survey pers
2、onnel were not required to rappel the vertical rock walls to obtain survey measurements. Surveyors can set up the scanner at a safe location and collect millions of accurate 3D points referred to as a “point cloud.” The digital point cloud can be analyzed, manipulated, and modeled conveniently in th
3、e office. Conventional surveys only capture a fraction of the points collected by HDS and can take up to twice as long to collect. Survey crew return site visits are eliminated because the entire project area is captured accurately in 3D the first time. PRODUCTION SR 322 Structure #207 Port Matilda,
4、 PA Courtesy of GPI, Inc. Courtesy of GPI, Inc. This SR 322 curved girder structure was scanned during all phases of construction. The detailed scans were studied by PennDOT along with Pennsylvania State University to determine movement of all bridge components during construction compared to moveme
5、nts calculated by traditional computer methods. The study costs would have been prohibitive, virtually impossible, and not as accurate using conventional survey methods. PERFORMANCE Hickory Street Bridge Warren, PA Modeling structures with HDS technology enhances the ability to study deteriorating s
6、tructures. HDS provides detailed data which helps to make modeling the structure a manageable task. Detailed scaleable imagery is captured for all surfaces of the structure. 2D and 3D maps and drawings are readily produced from the point cloud. HDS has been shown to be a reliable survey tool. HDS sh
7、arply increases production, accuracy, reduces field time, and produces a better quality product. Why Use HDS? Safety J Sheer rock-faces J Deteriorating bridges J New construction J Heavily traveled highways J Intersections J Overhead utilities J Underground pipes J Tunnels J Subways J Pavement quali
8、ty inspection J Construction payment J Roadway milling Production J Reduce field time by 50 percent J Reduce the size of the survey crew J Complete 3D coverage of project site, no need for follow-up surveys Performance J Millimeter accuracy of 3D J Informative imagery J Reliable precision between sc
9、ans J Ultra fast data capture (I000 points per second) J Operable under most weather conditions measurements State DOTS Using HDS 0 California 0 Colorado Florida Maine 0 Maryland o Massachusetts Michigan 0 Mississippi o Nevada NewYork 0 North Carolina Pennsylvania Texas o Virginia o Washington Contact Info: Gary A. Hoffman-PennDOT gahoffmanstate.Da.us L. Bradley Foltz-PennDOT I bfoltz,state.pa.us American Association of State Highway and Transportation Officials 444 N. Capitol Street NW. Suite 249 Washington, D.C. 20001 http:Ilwww.aashtotig.org
