Question 4 of 5: Dale on the Cost of High-Precision Cadastral Surveys

Question 4: Dale on the Cost of High-Precision Cadastral Surveys (25%)

Question text not reproduced: the examination questions are © Engineers and Geoscientists BC. Open the official past paper (linked at the top of this page) to read the question, then follow the worked solution below.

Dale's distinction between accuracy (closeness to the true value — a necessity) and precision (fineness of measurement — a cost) was sound in 1976 and remains conceptually sound today. His empirical claim, however — that there is no evidence to justify the cost of high-precision cadastral surveys — has been substantially overtaken by technology and by the changing uses of cadastral data. My overall view: the underlying principle (spend on accuracy, be cautious about paying for precision beyond need) still holds, but the practical conclusion is now much weaker, because in 2015 high precision is often no longer expensive, and it now delivers benefits that did not exist in 1976. Three factors inform this answer.

Factor 1 — The collapse in the cost of precision (technology). In 1976 high precision meant slow, skilled, expensive work with theodolites, chains/EDM and elaborate procedures; each extra order of precision cost real money, so Dale's cost–benefit caution was well founded. Since then, GNSS/RTK positioning, robotic total stations, and least-squares network adjustment have driven the marginal cost of an extra centimetre of precision toward zero. A modern surveyor frequently obtains centimetre-level coordinates as a by-product of ordinary practice. When precision is nearly free, Dale's premise — that its cost cannot be justified — largely dissolves: there is little cost left to justify.

Factor 2 — New uses of the cadastre that reward precision (the coordinated / multipurpose cadastre). In 1976 the cadastre was chiefly a record of ownership; the boundary "worked" if neighbours knew roughly where the fence went. Today cadastral geometry is integrated into GIS, land-information systems, 3-D and strata/condominium registration, infrastructure and utility management, taxation, and increasingly a coordinated cadastre where every parcel corner carries published coordinates in a national datum (NAD83(CSRS) in Canada). These uses reward higher precision: coordinated corners let parcels be reconstructed if monuments are lost, support automated conflict detection, and enable dense urban and vertical development where a decimetre matters. Value that did not exist in 1976 now sits on the other side of Dale's ledger.

Factor 3 — Land value, density and dispute cost (economics). The justification for precision scales with what the land is worth and how densely it is used. On a remote quarter-section, decimetre precision is still hard to justify — Dale is essentially right there. In a dense urban core, a high-rise footprint, or a strata development, a few centimetres of boundary uncertainty can mean a very large sum, an encroaching structure, or costly litigation; here precision is cheap insurance against expensive disputes. So the answer is context-dependent: the cost of precision must be weighed against parcel value and use intensity, and in high-value, high-density Canadian settings the evidence to justify precision now plainly exists — the opposite of Dale's flat claim.

Conclusion. Keep Dale's principle — accuracy is a necessity, precision a cost to be justified — but reject his empirical verdict as time-bound. In 2015 the cost of precision has fallen dramatically while its benefits have multiplied, so for a great many surveys the evidence to justify high precision now clearly exists; the caution survives only for low-value, low-intensity land where the extra precision still buys little.