Matthew William Newsome
  • Dayton, Ohio
  • United States
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How do you measure your heights?

Started this discussion. Last reply by Dave Drahn Jun 16, 2017. 15 Replies

So my crew is in a heated debate on the correct way to measure heights to a prism on a tripod. Since there are so many techniques I was wondering if there was a general consensus among us for…Read more →

Subject Tags: control, traverse, tripod, foresight, Prism

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How do you measure your heights?

So my crew is in a heated debate on the correct way to measure heights to a prism on a tripod. Since there are so many techniques I was wondering if there was a general consensus among us for determining the height of a prism on a tripod. What do you measure to and why?See More
Jan 24
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Profile Information

I am here because I am a.
Surveyor
Surveyor Bio:
Hi All, I am a municipal surveyor for a city in Ohio. We provide mostly Topo but un a wide range of services from GPR to as-builts.
Company
City of Dayton
Licenses Certifications or Awards
Associates Degree - Civil Engineering Technology
Associates Degree Construction Management
Surveying Certificate
Advanced Surveying Certificate
Six Sigma Green Belt
Geodetic Leveling Seminar - NGS
I have experience with the following
GPS, topographic, boundary surveys, construction staking, topographic surveys, control network surveys, ground movement monitoring, GIS, Survey Office, Construction, Machine Control, Military, Student of Surveying, GPR
How many years have you been surveying?
7

Comment Wall (2 comments)

At 1:53am on June 14, 2017,
Seeking Employment
Sibgatullah ahamd najar
said…

A prism is a three-dimensional solid with two parallel bases, or faces, that are congruent. The shape of the base determines what type of prism you have, such as a rectangular or triangular prism. Because it is a 3D shape, finding the volume (space inside) of a prism is a common task; however, sometimes you will need to find the height of a prism. Finding the height is possible if you have enough information already given: either the volume, or the surface area and perimeter of the base. The formulas described in these methods can work for prisms with bases of any shape, provided you know the formula for finding the area of that shape

At 6:24pm on June 13, 2017, Grant Sutherland said…

sometimes prisms are offset horizontally from the plumb point. Yet another thing to consider as well as cant of the prism. You really need to look at the problem fundamentally instead of trying to use a generic method that may not work for your specific situation. I use Nikon prisms that are configured 30mm forward of the plumb point in order that I don't have to concern myself with prism constants in the instrument. However, and a big however it is. You need a sighting target to sight to not the centre of the prism as this is not over the plumb point if slightly oriented wrong. Generally the prism arrangement will have a pin-point on the side of its tilting axis. The measure vertically from this to the ground point. The offset from the plumb point at this level to the measurement index point is 33mm, so on a height of prism of say 1600mm, the correction to vertical from slope will be only -0.3mm (negligible)

 
 
 

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