URBAN TRAFFIC DATA COLLECTION FROM CONVENTIONAL AERIAL PHOTOGRAPHY

Manual and automatic ground methods have several disadvantages. The author summarises the problems associated with ground methods and describes a study to investigate the feasibility of developing a complete traffic data collection analysis and presentation technique which could be operated by unskilled or semi-skilled personnel. The study area chosen was a 2 km by 900 M section Leeds city centre. Black and white prints, at a contact scale of 1 in 4000, were used with a flying height of 640 M. Details are given of the method of data collection and its analysis. Problems encountered at each stage are discussed and potential sources of errors identified. A computer program is used to produce the national grid co-ordinates of each vehicle, measure its distance travelled, and determine the spot speeds of vehicles in each street. Vehicle trajectory curves were produced together with headway and flow data. The computer also produced traffic density contours over the whole of the study used for each flight. The main disadvantage of the method was found to be the need to edit the data before processing; even so, it is considered to be a suitable alternative to conventional ground methods. For the covering abstract of the conference see IRRD 254397. (TRRL)

  • Supplemental Notes:
    • Conference on Traffic Data Collection, Leeds University, January 8-9, 1979.
  • Corporate Authors:

    University of Leeds

    Department of Civil Engineering
    Leeds, West Yorkshire  United Kingdom  LS2 9JT
  • Authors:
    • UREN, J
  • Publication Date: 1979

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 24 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00335301
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Nov 23 1981 12:00AM