Photographic Intersection - a brief overview

The low cost method for accurately measuring 3D points.

Photographic Intersection - how I developed my ideas

A brief history of the events and ideas that developed into my views on Photographic Intersection.

Photographic Intersection - the technicalities

The technical details that support Photographic Intersection.

360° Panoramic Optic for Photographic Intersection

A Conical Mirror or Prism to provide a full 360° panorama for surveying and mapping.

Determining the Nodal Point of a Lens

For a lens to be used effectively for Photographic Intersection the location of the Front Nodal Point must be accurately determined.

Photographic Intersection by Light Line for measuring Tunnels

Images of the FITS and  HITS units being used to measure tunnel profiles.  A Light Line is projected onto the tunnel surface defining a plane through the tunnel at the particular chainage require.  This is photographed and digitised to produce an accurate profile of the tunnel.  A 1000 metres of tunnel could be measure every 10 metres in a single nights possession using this technique.

Optic for instantaneously photographing an horizon of 360°

Patent specification GB1493188, 22nd April 1975.

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Method and apparatus for photographic tunnel sectioning

European patent application.

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