EFFECT OF AMBIENT LIGHTING DURING PHOTOLOG FILMING ON VISUAL RATING OF PAVEMENTS FROM RESULTANT IMAGES. INTERIM REPORT

This project attempts to determine the relationships between visibility of pavement cracks and sun position, data-collection direction and sky conditions. The study is performed with images obtained via the Connecticut Department of Transportation's (ConnDOT's) Photolog vehicle, which were placed on laser videodiscs and viewed with the ConnDOT Photolog Laser Videodisc System. Data were collected on a flexible and rigid pavement by filming each site hourly on several days between March and September 1990. Several technical problems caused a portion of the images to be unusable. Study design flaws caused the remainder of the usable data to be unacceptable for detailed statistical analysis. General observed relationships indicate, however, that the ability to detect and quantify cracking is dependent on the facing direction and the time of day. However, the orientation of the cracks transversely or longitudinally to the observer, and the crack widths, are also important variables. Additional data will be collected and analyzed during 1992.

  • Corporate Authors:

    Connecticut Department of Transportation

    Division of Research, 280 West Street
    Rocky Hill, CT  United States  06067-3502

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Larsen, D A
  • Publication Date: 1992-4

Language

  • English

Media Info

  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 53 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00624957
  • Record Type: Publication
  • Report/Paper Numbers: FHWA-CT-RD-1410-1-92-5
  • Contract Numbers: Study No. 1410
  • Files: TRIS, ATRI, USDOT, STATEDOT
  • Created Date: Sep 18 1993 12:00AM