This discussion pertains to leveling monitoring and turning on each point or using a change plate and measuring the elevation of each point, which means breaking the elevation circuit that was started from the monument used in the survey.
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Replies
Please forgive my stupidity. I am studying ancient Chinese agriculture and the turtle is often mentioned. How does the Turtle operate?
Thank you.
The change plate or Turtle is a small round disk with three little legs welded to it. You put the base of the rod on it when you are leveling on soft ground.
I have used turtles even on flat concrete or doing double rods loops,placing the turtle in the gutter for the lower elevations turn in the double rod loop.They work great for this and also fast,even speed up the level run.I do not know who invented them,but the first time i use one i thought what a great invention.
Please see
http://surveying.com/Products/Fiberglass-Rods-and-Accessories/Turni...
or
http://www.btowstore.com/WebRoot/BT/Shops/17854/Products/DSCP1/1785...
JAC
any comments on this topic???
I would love to comment but I'm unsure of the question... turning points or change plates?
JAC
The change plate or turtle is the item that is used when you are using the digital invar rods. We use them here in Canada a lot when doing precise leveling. I have read in some survey text books that if you are leveling on solid ground then you not need to use the change plate but at our company the level crew uses the change plates all the time until they reach a monument or the monitoring point they need to level.
Getting back to precise leveling of points in a deformation leveling loop what would be better? Turning on each deformation point or measuring the point and then carry on to the next point and not turn on the point at all?