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CE 311L Fieldwork # 14 STADIA LEVELING

Year & Section 3CE-A Date Performed October 15, 2014

Group No. 1 Time Started

Actual Site UST Grandstand Time Finished

Weather

Condition CLOUDY Date Submitted OCTOBER 21,2014

Group Members Designation

ABADO, NICOLE LOUISE, L. Chief of Party / Photographer

ABELLA, JAYDEE ANNE, C. Data and Record

ALBIS, MARJORI, M. Writer / Illustrator

ANGELES, SANTIAGO JR., V. Surveyor

AYUYAO, GIL OLIVER L. Surveyor

BAUTISTA, HEINRICH VANN, V. Rod Man / Illustrator

BERONA, CHRISTELLE MARIE, A. Data and Record

CAC, ANTHONY NATHANIEL, D. Rodman

Fieldwork No. 14

Stadia Leveling I. Objective

To determine the elevation of points using stadia method. II. Introduction

The stadia method provides a faster method of leveling in rough and hilly terrain where a high

degree of precision is not required. The process involved is very identical to that in differential leveling. The main difference is that the line of sight in stadia leveling does not have to be brought a horizontal position as in differential leveling.

III. Activities Procedure:

1. Set up and level the instrument at any convenient location along the designated survey route.

The telescope does not have to be levelled. 2. Take a backsight on the rod held at the bench mark and observe and record the upper, middle,

and lower stadia hair readings, as well as the vertical angle.

3. Establish a turning points ahead of the instrument station and along the general direction of the survey route;

4. Take a foresight on the rod held at the turning point and observe and record same variables; and

5. Transfer the instrument to a new location in advance of the turning point, and repeat the process of taking all four readings at each point being sighted. Continue the process until an observation (foresight) on the terminal point is taken.

The Pontifical and Royal

University of Santo Tomas The Catholic University of the Philippines

Faculty of Engineering Department of Civil Engineering

CE 311L: Surveying Fieldwork/Laboratory

Lab 6, Ground Floor, Roque Ruao Bldg., Espaa

Boulevard, Sampaloc, Manila, Philippines 1008

(632)406-1611 loc. 8516


IV. Formulas

VD = Ks cos sin + C sin DE = RRb VDb + VDf - RRf

VD = Kscossin

K = 101.69

S = upper lower

V. Data and Results

14.1. Reading Data

STA

OCC

STA

OBS

Backsight Foresight

Upper Middle Lower Vertical Upper Middle Lower Vertical

Angle()


Angle()

Guard House GH 2.5 2.41 2.32 3

Arch of the

Century

BM1 2.9 2.51 2.22 1 2.25 2.22 217 5

Benavidez

Monument

BM2 1.98 1.70 1.55 1 3.17 2.74 2.30 1

AMV Balcony BM3 0.72 0.57 0.43 20 0.86 0.66 0.47 15

AMV Ground

Floor

BM4 1.75 1.64 1.54 1 1.76 1.66 1.56 1

Health Service BM5 1.79 1.625 1.46 1 1.87 1.72 1.56 1

Main Building

Ground Floor

BM6 2.19 1.98 1.78 1 1.94 1.78 1.61 1

Martyrs

Monument

BM7 1.61 1.505 1.40 1 3.26 2.82 2.38 1

UST Grandstand BM8 1.66 0.47 0.30 2.25 1.40 0.89 0.57 3

Fountain of

Wisdom

BM9 2.60 2.07 1.88 1 1.89 1.67 1.47 1

Main Building

Rooftop

BM10 2.89 2.07 1.32 6.67

14.1.2. Inclined Sights

STA

OCC

STA

OBS

Backsight Foresight DE

(m)

Elevation

(m) s () VD RR s () VD RR

Guard House GH 0.18 3 0.957 2.41

Arch of the

Century

BM1 0.68 1 1.207 2.51 0.08 5 0.706 2.22 -0.061 100

Benavidez

Monument

BM2 0.38 1 0.674 1.70 0.87 1 1,545 2.74 0.107 99.939


AMV Balcony BM3 0.29 20 7.172 0.57 0.39 15 9.915 0.66 10.281 100.046

AMV Ground

Floor

BM4 0.21 1 0.373 1.64 0.20 1 0.355 1.66 -7.907 100.327

Health Service BM5 0.33 1 0.586 1.625 0.31 1 0.550 1.76 0.097 100.420

Main Building

Ground Floor

BM6 0.41 1 0.728 1.98 0.33 1 0.586 1.78 -0.155 102.517

Martyrs

Monument

BM7 0.21 1 0.373 1.505 0.88 1 1.562 2.82 -.006 102.362

UST

Grandstand

BM8 1.36 2.25 5.425 0.97 1.03 3 5.474 0.89 5.716 100.356

Fountain of

Wisdom

BM9 0.72 1 1.278 2.07 0.42 1 0.745 1.67 -5.380 108.072

Main Building

Rooftop

BM10 1.57 6.67 18.409 2.07 17.131 119.823

VI. Computations

TRANSIT: For (FS) BM1: VD = (101.69)(0.08)cos5sin5

= 0.706 FOR HI1: DE =2.41-0.957+0.706-2.22

=-0.061 Elevation for BM1:

100+(-0.061) = 99.939 VII. Drawings and Figures


VIII. Sources of Errors

In this 14th fieldwork, we latter found out that the following circumstances may bring and might have brought mistakes in our data. Since it was raining, we couldnt avoid the moistening of the lenses

of our instrument. This lead to a great mistake in the measurement. Thus it may also destroy the instrument. Because of this, we might have as well took wrong sighting of differences of elevation between points wrong measure the length of traverse lines and so are other Natural, Physical,

Instrumental errors follow and contribute.

IX. Conclusion and Remarks

In this fieldwork we were given the chance not to lock the vertical angles of the telescope thus giving us a

greater range to measure. The elevation of any object is its vertical distance above or below an established

height on the earth's surface. The group was able to determine the elevations of the different bench marks

in UST by using stadia leveling and applying our past knowledge about differential leveling. Thus, through

application of the basic knowledge in surveying done on the past fieldworks, we achieve and end on


accurate, precise measurements. Proper installation of instruments and usage is strictly advised to arrive

at an accurate data.

X. References

https://engineering.purdue.edu/~asm215/topics/difflevl.html

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