I’m an engineer involved in construction and who does some surveying to support construction activities.
When I was a student (mid 70’s) I had several summer jobs that involved survey work. At that time I was using equipment and methods that a surveyor 100 years ago would have understood and quickly been able to adopt.
The equipment was basically the same, the main differences were that my transit had better optics and was capable of reading to a closer tolerance. The metal tape had replaced the old chains but would have been quickly understood by my professional forbearers.
The methods of analysis and using the data were basically the same. To close a traverse I would have a pencil and paper spreadsheet and do all the calculations by hand, getting some error of closure that was either acceptable or not. The biggest difference between what I did in 1975 and the way things were done in 1875 was that I might have used a 4 function calculator for the arithmetic, I would have still looked up the trig functions in tables.
Now with total stations electronic distance measurement, GPS and other new technologies, surveying has radically changed. Tasks that took days under the old methods can now be done before lunch. Measurements that involved reading a metal tape to the nearest 5 mm now are done electronically and displayed to the nearest 1 mm or 0.1 mm.
I feel that there is an over reliance on the technology with little real understanding of the underlying principles involved. The belief is that the technology cannot make a mistake so the answer, whatever it is, has to be right.
The technology cannot make a mistake but the operators sure can. An inaccurately setup instrument or one poorly operated will produce garbage results. It will however produce garbage results to a high degree of precision that will foster a belief that the measurement is exact so therefore it mist be accurate.
Very similar problems exist in other branches of engineering and the technical professions. Technology and an over reliance on it has drastically changed the nature of our professions.
The end result is that because it can be easy to produce accurate technical work, anyone can do it. All it takes is reading the input prompts on the computer program and putting in the right information. No real skill is involved so people with no real understanding can do it and do it for lower costs.
This means that people do not check their traverses and make sure that they close in the field. They will do a large traverse and leave it open at the end where we would have done smaller closed traverses and checked each one at the time. There is no sanity check at the end of the job.
When you couple this technology trend with the educational system focusing on a student’s self esteem rather than on capabilities you get junior technical people who believe that they cannot make a mistake and are using technology that cannot make mistakes and therefore there is no need for checking or otherwise admitting that there is any possibility of error.
This summer I was working on a small residential sub division. I had set the grades for the roads and sewers and as a favour to the developer had set house lot grades. The local municipal surveyor came on site late in the day on the day before the foundation concrete was to be poured. He, in spite of the fact that the roads were in and the elevations looked to be within normal designs, simply took one open vertical traverse shot, announced that the house footing was 1 m to high and that it would have to be changed before the contractor could proceed. (The delay would have cost the builder a couple of weeks because the concrete crews were that booked up.)
Of course what happened was that his rod man had held the rod in the wrong place for the back sight. What astounded me was that he would not admit that there was any possibility of an error on his part or that he had any responsibility for the problem or that he had any responsibility to at least do a sanity check on his work or for the actions of his rod man. Even after this he came back on site and rechecked the work without closing the traverse.
Rick Kitson MBA P.Eng
Construction Project Management
From conception to completion