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Short Course: Photogrammetry & Digital Imaging

Photogrammetry & Digital Imaging

Course Summary

Photogrammetry has undergone something of a renaissance in recent years resulting in TSA’s decision to run a quarterly short course on the topic. The demand for the course has arisen because of the recent introduction of more user friendly and semi-automated methods developed via a combination of computer vision algorithms and conventional photogrammetry.

The application of the new techniques has grown enormously due to:

  • the low investment costs,
  • general familiarity with photography,
  • the increasing interest in the provision of 3D metric data for archaeological, architectural and engineering purposes and
  • the use of small unmanned aircraft (SUAs) for survey and reconnaissance work.

The new technique uses image matching methods and off-the-shelf cameras for the production of geo-referenced point clouds that can be favourably compared to those produced by laser scanners. The use of SUAs for aerial survey of smaller sites is a fraction of the cost of conventional aircraft and the newer algorithms are perfect for the analysis of the many smaller and more randomly distributed images taken on an SUA project.

An example of a mid-range SUA carrying a video and a still camera.

An example of a mid-range SUA carrying a video and a still camera.

Mary model

Agisoft Photoscan photogrammetry software in use for the production of an architectural 3D model.

The course has been running since 2015 and is a teaching module with some practical exercises where resources allow. It covers:

  • photographic methods and other field considerations
  • conventional photogrammetry theory and applications
  • plane and ortho rectification of imagery
  • user orientated techniques now available in lower cost software (eg EOS Photomodeler Scanner, Bentley ContextCapture and Agisoft Photoscan) and their application
  • the advantages and disadvantages compared to laser scanning
  • specifying and commissioning projects
  • case studies

The course extends over three days and includes six sessions of 2.5 hours each.

Aerial image lower banner

The same software showing a topographic 3D model and the distribution of the aerial images.