Abstract
The note explores the application of stereo-photogrammetry to the measurement of planar displacement fields. A research program at Southampton University has extended the basic theory of the method to include determination of strain fields and velocity holographs from the displacements, detailed measurement of complex patterns of water surface velocities and the use of anaglyph slides. The note examines the possibility of detecting displacements of individual sand particles in a plane to at least 5 micrometer sensitivity. The angular rotation of individual sand grains during displacement is studied and the detailed information obtained by stereo-photogrammetry is compared with that provided by an embedded grid of discrete markers in the soil model. The investigation establishes that planar displacement of individual sand grains in a deforming model can be measured to within 5 micrometers using a photogrammetric technique. /TRRL/
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