PERSPECTIVE TEMPLATE FOR PHOTOGRAPHIC MAPPING OF EVIDENCE

INVESTIGATION OF AN ACCIDENT OR CRIME MAY REQUIRE PHOTOGRAPHS AND A MAP OF THE SCENE BUT TIME IS SHORT AND MEASUREMENTS FOR A MAP ARE OFTEN OMITTED WITH THE IDEA THAT PICTURES ARE SUFFICEINT IN THAT MEASUREMENTS CAN BE MADE LATER. A SOLUTION TO THE DILEMMA IS TO MAKE PICTURES FROM WHICH MAPS CAN BE DRAWN IF AND WHEN NEEDED, BY THE USE OF A PERSPECTIVE TEMPLATE OF A KNOWN SIZE. IF WHAT IS TO BE MAPPED IS ON A FLAT FLOOR OR PAVEMENT, A RECTANGLE OF KNOWN SIZE CAN BE SHOWN ON THAT SURFACE IN THE PICTURE. WITH THE USE OF THE TEMPLATE, VANISHING POINTS ARE LOCATED ON THE ENLARGED PHOTOGRAPH AND A PERSPECTIVE GRID CONSTRUCTED. AN ORTHOGONAL MAP GRID IS PREPARED TO SCALE AND THE LOCATION OF OBJECTS IS THEN TRANSFERRED ONTO THIS GRID. IF CAREFULLY DONE, MAPS MADE FROM PERSPECTIVE TEMPLATE PHOTOS ARE ADEQUATE FOR ALL ORDINARY PURPOSES.

• Authors:
  • Baker, J S
• Publication Date: 1972-1

Media Info

• Features: Figures; Photos; References;
• Pagination: p. 1-11
• Serial:
  • TRAFFIC DIGEST AND REVIEW
  • Volume: 20
  • Issue Number: 1
  • Publisher: Northwestern University, Evanston

Subject/Index Terms

• TRT Terms: Crash investigation; Field tests; Geometry; Mapping; Photography
• Uncontrolled Terms: Field measurements; Templates
• Old TRIS Terms: Photographic methods; Projective geometry
• Subject Areas: Highways; Safety and Human Factors;

Filing Info

• Accession Number: 00221677
• Record Type: Publication
• Files: TRIS
• Created Date: Jun 5 1972 12:00AM