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drawings and rectified photography, it is clear that the type of product that can be produced by laser scanning is not the same as that 
traditionally produced by architectural photogrammetry, although its value as a data source is acknowledged. 
Some of the main issues to be addressed in laser scanning, and survey techniques as a whole for architectural applications can be 
summarized as follows; 
• Redundancy - how can the essential role of redundancy be achieved with laser scanning? 
• Testing - can standardized tests and test data be devised for distribution amongst interested parties with backing from 
organizations such as CIPA? 
• Integration - can the strengths of different survey techniques, including laser scanning be best integrated with the aim to 
produce a more usable and cost effective result? 
Laser scanning is set to become a valuable method of survey and should be embraced by the heritage community. However it is 
important to pursue rigorous independent testing and evaluation and to provide a standard specification on the use of such systems in 
order to ensure metric survey recording maintains a reputation for high quality work. 
8. ACKNOWLEDGEMENTS 
The authors would like to thank Cyra Technologies, Callidus Precision Systems, Riegl Laser Measurement Systems and 3D Laser 
Mapping, Nottingham UK, for help with the collection of the example datasets. Thanks are also due to David Sherlock at English 
Heritage and Alexandria Palace UK. 
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