2013 Session: 582

• Transportation Applications for Mobile Lidar Scanning:State-of-the-Practice Questionnaire
  Abstract: The relatively recent emergence of mobile Light Detection and Ranging (LIDAR) technologies as a potentially transformative tool for numerous transportation engineering applications coupled with a lack of existing standards has resulted in the need for an improved understanding of how this technology is currently being implemented, and what challenges are limiting its adoption. To that end, a questionnaire was administered to State Departments of Transportation (DOTs) to document and evaluate the state-of-the-practice regarding mobile LIDAR in transportation applications. Representatives from each of the 50 U.S. states and 6 additional transportation agencies completed the questionnaire, for a total of 74 responses. A second service provider questionnaire was completed by 14 companies experienced with mobile LIDAR services. Interestingly, it was determined that more DOTs have used mobile rather than airborne LIDAR services in the last year, even though mobile scanning is a less established technology. Additionally, the results showed that DOTs perceive cost to be one of the most significant challenges to the adoption of mobile LIDAR, indicating that more evidence and education are required regarding benefit to cost comparisons of the technology. The questionnaire also revealed current struggles as DOTs transition from two- to three-dimensional workflows and modeling. These questionnaires established a technology adoption baseline that can be used to measure future progress and provide the foundation for national guidelines currently under development.
  Authors: Hurwitz, David S.; Tuss, Halston; Olsen, Michael James; Roe, Gene; Knodler, Michael A.
  Authors: Hurwitz, David S.; Tuss, Halston; Olsen, Michael James; Roe, Gene; Knodler, Michael A.
  Year: 2013
  Document Type: Paper
  Subject: Construction; Data and Information Technology; Design
  Session: 582
  Paper Number: 13-1606
• Data Density Requirements as Functions of Design Speed for Controlling Accuracies of Horizontal and Vertical Curve Representations in Surface Models for Automated Machine Guidance
  Abstract: When designed, horizontal and vertical highway alignment components are parametrically-described geometric objects (e.g., smooth curves and straight lines). On the other hand, surface models during design, and for automated machine guidance (AMG) during construction, are not geometrically smooth. Rather, they are triangulated irregular networks containing straight line segments that serve as edges of contiguous triangular facets. Designers and/or construction contractors must decide how frequently to discretize parametric design objects for adequate representation by these line segments in surface models. Higher data frequencies, or densities, result in more accurate representations of design. However, high data densities lead to large file sizes, greater storage and data management requirements, and greater data transfer times. Mathematical derivations are presented that relate minimum required data densities to error tolerances for horizontal and vertical curves. The mathematics couple expressions of tolerable error with parameters of curves and, more fundamentally, with design speeds, using geometry, physics, and quantifiable human factors. An example is provided wherein the method was used to produce interim standards for electronic design/AMG for pilot projects with the Wisconsin Department of Transportation. The mathematics should be straightforward for incorporation in design software to ensure that individual design objects, groups of them, or entire corridors are represented to acceptable levels of accuracy, with minimum data requirements, in surface models used for construction by AMG.
  Authors: Vonderohe, Alan; Hollister, Brad
  Authors: Vonderohe, Alan; Hollister, Brad
  Year: 2013
  Document Type: Paper
  Subject: Construction; Data and Information Technology; Design
  Session: 582
  Paper Number: 13-1405
  Practice-Ready: Yes
• Transportation Applications for Mobile Lidar Scanning: State-of-the-Practice Questionnaire
  Authors: Hurwitz, David
  Authors: Hurwitz, David
  Year: 2013
  Document Type: Presentation
  Subject: Construction; Data and Information Technology; Design
  Session: 582
  Paper Number: 13-1606
• Data Density Requirements as Functions of Design Speed for Controlling Accuracies of Horizontal and Vertical Curve Representations in Surface Models for Automated Machine Guidance
  Authors: Vonderohe, Alan
  Authors: Vonderohe, Alan
  Year: 2013
  Document Type: Presentation
  Subject: Construction; Data and Information Technology; Design
  Session: 582
  Paper Number: 13-1405
• Mobile LiDAR for Construction Monitoring
  Authors: Padgett, Jeffrey
  Authors: Padgett, Jeffrey
  Year: 2013
  Document Type: Presentation
  Subject: Construction; Data and Information Technology; Design
  Session: 582
  Paper Number: P13-6137
• MAP-21 and Everyday Counts
  Authors: Clabaugh, Curtis
  Authors: Clabaugh, Curtis
  Year: 2013
  Document Type: Presentation
  Subject: Construction; Data and Information Technology; Design
  Session: 582
  Paper Number: P13-6136
• Mobile LiDAR for Construction Monitoring
  Authors: DiGiacobbe, Paul
  Authors: DiGiacobbe, Paul
  Year: 2013
  Document Type: Presentation
  Subject: Construction; Data and Information Technology; Design
  Session: 582
  Paper Number: P13-6137