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DAVID C. GARCELON
  • Male
  • Harpswell, ME
  • United States
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DAVID C. GARCELON's Associates

  • Benjamin J Everett
  • Marko Jankovic
  • Stephen Bonser
  • REJESH KUMAR REMESHAN
  • Syed Iqtedar Hussain Naqvi
  • Lokinder Rana
  • Nataly Shups
  • Dumisani Mlambo
  • Scott D. Warner, PLS
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DAVID C. GARCELON's Discussions

FAMOUS AMERICAN SURVEYORS

Started this discussion. Last reply by ⚡Survenator⌁ Dec 13, 2017. 1 Reply

this is the picture I mentioned in my post made a few minutes ago.…Read more →

Subject Tags: HISTORY, MAPPING, AND, SURVEYING

Famous American Surveyors

Started Dec 5, 2017 0 Replies

I am attaching page two of my previous post of Famous American Surveyors, with the names and lifespans of each added.Enjoy.    David C. Garcelon…Read more →

Subject Tags: HISTORY, MAPPING, AND, SURVEYING

THE LONGEST SIGHT.

Started this discussion. Last reply by Robert Vautrinot Nov 27, 2017. 8 Replies

Many surveyors of my era, when asked what the longest sight line they have ever made, give the wrong answer simply because they don't think of this as a sight line. The answer is 430 light years, the…Read more →

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DAVID C. GARCELON's photo was featured
Mar 20
SHRIKANT GUTHE commented on DAVID C. GARCELON's photo
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1820 REPEATING CIRCLE with TWO TELESCOPES (USCS)

"Had it not been for the surveyor, we wouldn't have known the earth as we know today. It was their effort in land surveying &  survey drafting services which resulted in the profession so big to accumulate  cad drafting companies…"
Mar 20
⚡Survenator⌁ replied to DAVID C. GARCELON's discussion MILITARY OFFICERS who were RAILROAD SURVEYORS and ENGINEERS
"flippable version"
Dec 28, 2017
DAVID C. GARCELON's discussion was featured
Dec 28, 2017
⚡Survenator⌁ replied to DAVID C. GARCELON's discussion MILITARY OFFICERS who were RAILROAD SURVEYORS and ENGINEERS
"Awesome paper David... thanks for sharing!"
Dec 28, 2017
DAVID C. GARCELON posted a discussion
Dec 27, 2017
⚡Survenator⌁ replied to DAVID C. GARCELON's discussion FAMOUS AMERICAN SURVEYORS
"Nice post David!"
Dec 13, 2017
DAVID C. GARCELON is on spot light
Dec 12, 2017
DAVID C. GARCELON posted discussions
Dec 5, 2017
DAVID C. GARCELON's discussion was featured

THE LONGEST SIGHT.

Many surveyors of my era, when asked what the longest sight line they have ever made, give the wrong answer simply because they don't think of this as a sight line. The answer is 430 light years, the object being sighted is Polaris!Did you know that same sight line  is also the longest made by governmental surveying agencies all over the world?The USC&GS claims the longest sight they have made between two points on the earth's surface is 193 miles long.What is the longest surveying sight…See More
Dec 2, 2017
Robert Vautrinot replied to DAVID C. GARCELON's discussion THE LONGEST SIGHT.
"I've shot lots of points more than a mile away using current technology, but I'm far prouder of the fact that in the 80's, I was accurate to within a foot and a half on shots over 800' using a Wild T-2 and stadia rod."
Nov 27, 2017
Allan Pringle replied to DAVID C. GARCELON's discussion THE LONGEST SIGHT.
"A meagre 15km - but that was for a braced quad in the Grampian Mountains, so no EDM required. Longest EDM shot probably around a 1.5km to a triple prism. Couldn't see the darned thing, and had to go with the strongest return signal - anything…"
Nov 27, 2017
Romeswar Seegolum replied to DAVID C. GARCELON's discussion THE LONGEST SIGHT.
"the longest sight with a single prism I've ever measured was 1.2 km. However you can barely see the prism only the rod is visible due to shimmering.  "
Nov 27, 2017
Romeswar Seegolum favorited DAVID C. GARCELON's discussion THE LONGEST SIGHT.
Nov 27, 2017
DAVID C. GARCELON and Benjamin J Everett are now friends
Nov 26, 2017
Benjamin J Everett favorited DAVID C. GARCELON's profile
Nov 26, 2017

Profile Information

I am here because I am a.
Professional Land Surveyor
Surveyor Bio:
I now lecture and consult re: surveying, antique surveying instruments and surveying history...feel I can not only learn from others but also can help to mentor younger surveyors.
I have been involved with such projects as the Central Artery/Third Harbor Tunnel in Boston, the Seabrook Nuclear Station in Seabrook, NH, the Vernon Nuclear Station in Vernon, VT., the 10,000 acre Mount Washington Hotel/Bretton Woods Ski Area in the White Mountains of New Hampshire. I have been the Chief Surveyor for several firms in the Boston area, as well as owned and operated my own Surveying/Engineerin business in Colebrook, NH for 12 years. I have the strong opinion that many surveyors have become so enarmored with modern technology that they forget that there were millions of boundaries established before they were born; those boundaries cannot be re-established by us. They can only be redefined. Defining a boundary to the nearest 1/100th of a foot and 1 second of arc can give us an unwarranted confidence in our work, especially if we have moved the original boundary. We must learn Boundary Law and the rules of evidence at the same time we learn how to use the tools and instruments..the tools and instruments constantly change but the laws and rules regarding the locations of boundaries has changed very little since the early 1600's. New tools and instruments allow us to mathematically redefine boundaries...their use does not give us permission to change the location of a long established boundary! We older surveyors need to learn the new technology and at the same time pass on our knowledge and experience re" boundary laws and the rules of evidence.
Location for Member Map
Maine
Licenses Certifications or Awards
Have held PLS licences in NH, ME, VT and MA
I have experience with the following
GPS, cadastral, topographic, boundary surveys, construction staking, topographic surveys, control network surveys, ground movement monitoring, GIS, teaching, Expert Testimony, Retired Surveyor, I Teach Surveying, Student of Surveying, Cartography
How many years have you been surveying?
54 YEARS
Most comfortable with the following types of instrumentation
Total Stations, GPS, Surveying Software, Automatic Levels, Old school surveying, theodolite, Chain, compass

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Comment Wall (1 comment)

At 5:46am on May 3, 2013, Dumisani Mlambo said…

I would do anything, to have you teach / lecture me.

 
 
 

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