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Ask Mr. Geodesy!

from NSPS

A recent question was presented to NSPS Staff, and it gave us the idea of perhaps beginning a periodic item in NSPS News and Views to be called Ask Mr. Geodesy! Let us know what you think of this idea.

Q. I have a question that has bothered me for years, and decided to Google who to ask, and came up with your names. The question is:

Continental drift separates North America from Europe at a rate of 1-3 inches a year (depending on which source I choose to believe). Our plat map for our lot lists the longitude of the eastern and western corners of our lot. This longitude is keyed to a line in Greenwich, England (as I understand as a layman). If this is so, then how does my property line make any sense? In the 16 years I have lived here, it has moved at least 16 inches, and as much as 48 inches. In a century, the movement is considerable (as much as 30 yards!). How do surveyors deal with this? more

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7701 Las Colinas Blvd., Ste. 800, Irving, TX 75063