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Extra info for Monitoring Building Structures

Example text

The analogue instrument, such as the ubiquitous Wild A8, helped to map many thousands of square kilometres of the earth’s surface, and these instruments will continue to be used while the demand for conventional mapping exists. However, the analogue instrument must be regarded as yesterday’s technology and is no longer adequate for the three-dimensional measurement tasks, or standards of precision, which photogrammetry is now expected to achieve, especially with non-topographic subjects. The analogue instrument had many limitations which, whilst of no major importance in the production of maps and plans, were sufficient to prevent its use in a fully three-dimensional environment.

1 Elements of system. From the foregoing examples it is clear that several things have to be taken into consideration in deciding which surveying technique is most appropriate to the structure that has to be monitored. Accuracy, targeting, instrumentation and timing are the key factors, for which the main considerations are given below. 2 Accuracy. 3, with such sophisticated equipment presently available there is a tendency to offer or specify equipment more advanced than the accuracy requires.

In these situations the frozen action effect of the photography permits the recording of a series of scenarios during the period of measurement. (5) A photograph records an infinite amount of data and thus photogrammetry is the most appropriate tool for the monitoring of buildings where a high density of information is required. (6) In certain types of monitoring projects it is not always possible to forecast with any accuracy exactly how a facade will respond when put under stress, whether by increased physical loading, by partial demolition or by undermining, etc.

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