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Index of Subjects Elevations are measured above "Highest High Water", "Large Tides" and is often refered to (atleast in the marine world) as "DATUM". Determined by the Canadian Hydrographic ????? (last part of their name escapes me) surveyors for that area. Our coastline is riddled with hydrographic survey pins from witch act as the bench/starting point for subsequent measurements. A quick glance at any Marine Chart will show the placement of these pins as a dot within a triangle and a height given along side. In almost all communities there is a stone (sometimes within the foundation of a large stone or brick building) in witch a brass pin is placed and this is the so called "Bench Mark" (on charts depicted as a dot within a circle with a discription). In Canso our "Bench" is located in the foundation wall of the Old Post Office. Hope this helps All the Best Tom K. Hoping that this is the last blast of winter. ----- Original Message ----- From: "Paul MacDonald" <paulrita2001@yahoo.com> To: <naturens@chebucto.ns.ca> Sent: Wednesday, March 07, 2007 10:45 AM Subject: Re: [NatureNS] Determining Elevation > Hi All > We had a very interesting discussion on this subject > recently which I follewed with interest. > One question remains for me. Just how is sea level > defined? High tide, low tide or the mean. If sea level > rises or falls does that throw the maps off? > Enjoy the late winter. > Paul > > > > > > ____________________________________________________________________________ ________ > Get your own web address. > Have a HUGE year through Yahoo! Small Business. > http://smallbusiness.yahoo.com/domains/?p=BESTDEAL
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