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On this site are examples of my work and research with photogrammetry, 3D graphics, CAD, mapping and surveying. All these subjects being closely bound together as a core theme – well for me at least. My professional expertise in statistics, signal processing, and scientific computing underpins it all.

Photogrammetric reconstruction model of a
single buttress from the Ailesbury mausoleum at Maulden.
High resolution version.

If you don't know what photogrammetry is, the most simple answer is that it is the science of making measurements from photographs. My usage of photogrammetry is orientated towards surveying, map making, 3D modelling and acquiring accurate scientific measurements.

The objective of the photogrammetric process is to produce a 3D model from which measurements can be made. The model is created from two or more photographic images of a target scene or object using a calibrated camera. The images are taken from a number of different positions around the target and "tied" together by the modelling process using a set of common control points. From the generated model it is then possible to accurately estimate three dimensional coordinates of various points of interest in the image set.


Photogrammetric dense surface model of the "corner feature"
at the Berrystead earthworks, Maulden.
High resolution version.

One main advantage of photogrammetry is that it can be a totally "hands off" measurement technique. In some instances it might not be possible to interact with or modify the target in order to measure it. For example physical access to a site may not be possible for whatever reason, or an object might be too delicate, hazardous or difficult to measure using normal instrumentation.


Photogrammetric 3D model of the gable end timber framework of
The George public house in Maulden.
High resolution version.

Photogrammetry has many applications, for example: surveying, map making, data acquisition, forensic evidence preservation and analysis, engineering, archaeology, history, 3D-printing and more. Generally, if it is possible to take a series of photographs of a target, then it is possible to make accurate measurements from them.

Please spend some time looking at some of my examples that show photogrammetry in operation on real projects. I intend to update the examples on a regular basis, just as soon as completed project work becomes available.

If you would like to know more about how photogrammetry may be deployed on your particular project, or if you would like to commission me (see my fees page), or indeed have any other queries, then please use the contact form or e-mail me.

Regards

Chris Calvey
email-address

Digital StillCamera
Chris: Just completing the St. Mary at Maulden church building survey in June 2014.

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