Differential Leveling Project Report
Dr.
Tobias Sando
CGN3301
Spring 2025
Group
Leader:
Hugo
Guerrero
Group
Members:
Shakim
Brash
Sydni
Jordan
Aiden
Vance
Table
of Contents
For this project leveling equipment
was used to run a closed traverse around a specific area of the UNF campus to
better familiarize ourselves with the surveying and leveling processes and
procedures. The use of the equipment in real time situations (measuring and
calculating BS, HI, FS) allowed us the opportunity for familiarity. Listed will
be images of the specific equipment used and a brief description of the use,
the points where measurements were taken, and the leveling calculations for
each point.
The microscopic level allowed for
the accurate measurement of elevation for our areas of concern. The correct
setup is imminent in the accuracy of this equipment.
The tripod is essential to the
set-up of the level. The adjustable legs allow for a more level base in the
toughest terrains, assisted by metal spikes for a more secure base.
The measuring rod was vital in
recording the height of the levels sight (HI), which in turn allowed us to
calculate the elevations at certain point (TPi). The
rod measured in imperial feet with smaller inch increments.
The sketch of the experiment was
created in ArcGIS PRO using the layout feature. The purpose of the map is to
demonstrate experimental processes in an illustrative manner. This is important
because it is easily understandable for someone with little to no experience in
differential leveling, or other surveying processes that require a layout. The
drawing contains a dotted line going to every point the tripod and level were
set up, with different symbology denoting the locations of the benchmark,
temporary points, and height of instrument points.
|
Point |
BS |
HI |
FS |
Elevation |
|
BM1 |
3.04
ft |
41.95
ft |
|
38.91
ft |
|
TP1 |
5.56
ft |
42.43
ft |
5.08
ft |
36.87
ft |
|
TP2 |
6.00
ft |
43.18
ft |
4.96
ft |
37.47
ft |
|
TP3 |
5.71
ft |
43.26
ft |
5.63
ft |
37.55
ft |
|
TP4 |
4.98
ft |
43.03
ft |
5.21
ft |
38.05
ft |
|
TP5
/ BM1 |
|
|
4.54
ft |
38.49
ft |
The BS, HI, FS, and elevation for
each point are shown above. HI and elevation values were found using the
following formulas:
HI = BS + elevation
Elevation = HI FS
An arithmetic check was used to
determine the accuracy of the measurements.
Through the arithmetic check, it was
determined that the measurements taken are accurate to a certain degree of
error. This is because the difference of the sum of the backsides and frontsides and the change in
elevation are within a value of 1 to each other. If there was a greater
difference between the two parameters, it's possible there could have been
major error in the experimental process.
While this project was necessary to
show how challenging the physical demand of land survey is and the necessary
knowledge to do the task, it also allowed a team to work towards one common
goal. With everyone's hands on approach and open-mindedness, the task allowed
us all to become more familiar with land survey equipment, procedures and the
importance of checks and balances. In conclusion, we are grateful for the
experience and look forward to learning more.