Posted by tomtirediron on July 04, 2012 at 05:10:38 from (208.123.10.208):
In Reply to: Any Surveyor's here posted by John in la on July 03, 2012 at 20:28:25:
I work as a Engineering Technician and perform highway survey, design and construction inspection. I Don't use GPS daily but am exposed to it and design off of the points provided to me by our county highway surveyor. It appears if option # 1 (if not using gps) is using a known elevation and an optical level to carry the grade to your place. Takes 2 people and more labor then GPS. If done with care from a good elevation is the most accurate. GPS if done correctly usually stays under a 1/2 inch in elevation. Option 3 should work out OK but I would allow a little elevation over and above the staked elevation to protect yourself from variation. BEST case scenario is have option 3 set up, get his gps to find it's elevation then have him shoot the highway marker 3 miles away to verify he's matching or close, then mark your grade. Insist that they provide you with a download-paper 1 page copy of the points they shot on their 1st visit for your records. Finally, don't know about LA, but do know here in Minnesota I wouldn't hire ANYONE who wasn't a licensed land surveyor or working under one to perform this work. Good Luck Tom B.
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