Depends. If you were measuring distance with a steel tape/chain then there is an equation you have to calculate based on temperature to determine stretch/shrinkage of the metal.
When shooting elevation with a transit & rod, you rock the rod to figure out the mean reading and then calculate elevation from that. Curvature of the earth wouldn't be an issue because you cannot accurately read a rod from that far of a distance.
Now days the transit and rod is used on lots, but not large surveys. You would use a total station that shoots a laser beam at a prism to shoot distance & elevation in one shot. Some of the units are robotic and the total station sits over a bench mark and one guy can walk around take all the shots he needs by himself. I believe the won't shoot more than 1/4 mile because accuracy is reduced the farther out from the base you are.
Other method is GPS, but that can be temperamental at times and it is used when you need to be a great distance from the base point since the GPS receiver with the man doesn't need a direct line of site to the base unit like the other methods mentioned.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - A Towny Goes Plowing - by Anthony West (UK). I live in an area renowned for its rural beauty. Small fields with hedgerows and trees are common place, as are small hamlets with village greens and the odd duck pond complete with swans. The center of any village once the shop is closed is the old tavern. Rustic places with cheerful names like "The Griffin" "Red Lion" or "The Plough and Harrow" are found dotted around the country lanes all over the place. The warm glow of yellowish light can be seen for quite some distance at dusk, and
... [Read Article]
Latest Ad:
For sale Farmall super A tractor is complete and has just been setting for awhile,it was running when pulled out of the barn,shouldn’t take to much to get it going asking 1100.00
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
