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Matthew William Newsome
• Dayton, Ohio
• United States
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## Matthew William Newsome's Discussions

### How do you measure your heights?

Started this discussion. Last reply by Dave Drahn Jun 16.

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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# Matthew William Newsome's Profile

## Community Feed

"If you're 4" off plumb measuring a 5.50' high target, the slant measurement would be 5.51.  I go with subtracting 0.01' at the most."
Jun 16
Matthew William Newsome's discussion was featured

### 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
Jun 16
Matthew William Newsome is on spot light
Jun 16
"Amen"
Jun 14
Sibgatullah ahamd najar favorited Matthew William Newsome's profile
Jun 14
"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…"
Jun 14
"I agree with Tony. But there is another drawback you cant use such benchmarks as reflecting dianas"
Jun 14
"Hi, I understand this problem, but there is more to it than that. At our company the surveyors attempted to make the target height the same as the instrument height; measured from the tribrach. Geodimeter  was the first to supply a stub that…"
Jun 13
"Use plumbob and bullseye on tribach to level it over station. Measure from prism mount plate to station and add on measured height from prism mount plate to centre of prism."
Jun 13
"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…"
Jun 13
"WTH??!!??"
Jun 13
"Don't measure. It drives slow thinkers crazy but the best thing to do is not to measure the height. 1. screw the prism and adjusting screws 2. read whatever the prism pole says, never mind if it's 1' or 100' or anything in…"
Jun 13
Tony Cato favorited Matthew William Newsome's discussion How do you measure your heights?
Jun 13
"yup..."
Jun 13
"If it has a hook use it this way you dont have to worry about slant measurements. You want a good representation of how far from the point on the ground is from the center of the crosshairs.so if you use a ruler you have to compensate for the slant…"
Jun 13
"???  Every once in awhile there is a question on here that makes me scratch my aging head... Mr. Obvious would like to point out that no matter what your prism configuration ( single, triple or ganged ) there will always be an aiming or target…"
Jun 13

## Profile Information

I am here because I am a.
Surveyor
Introduction to other Surveyors. One or more sentence Bio about your Relationship with Surveying
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
Associates Degree - Civil Engineering Technology
Associates Degree Construction Management
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

At 1:53am on June 14, 2017, 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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