FW02 — Horizontal Distance Measurement by Taping

I — Project Details

ItemRecord
Fieldwork / ProjectFW02 — Horizontal Distance Measurement by Taping
LocationUniversity Campus — East Field and Sloping Walkway
Date / TimeSeptember 10, 2026; 1:00–4:00 PM
Group / SectionGroup 1 / CE Surveying
Survey TypeDirect taping on level and sloping ground
Survey LinesL-01 to L-02; S-01 to S-02
Weather / GroundOvercast; dry ground
Safety ConditionIntermittent pedestrian traffic

II — Survey Team and Equipment Used

A — Survey Team

MemberAssignment / DescriptionRemarks
Student AParty ChiefNone
Student BHead Tape PersonNone
Student CRear Tape PersonNone
Student DRecorderNone
Student ERanging / Station MarkerNone
Student FSafety ObserverNone

B — Equipment Used

Equipment / InstrumentID / DescriptionQuantityRemarks
Steel TapeST-04; 30 m1Serviceable
Ranging RodRR-03 and RR-072Serviceable
Plumb BobPB-021Serviceable
Automatic LevelLV-021Used for elevation-difference check
Leveling RodLR-051Metric graduations legible
PPE SetHigh-visibility vest and closed shoes6Complete

III — Project Sketch and Photo Documentation

A — Project Sketch

FW02 — Horizontal Distance Taping Field Sketch

B — Google Maps Location Points

Point / AreaMap RecordPurpose / Limitation
Level-ground lineVerified Google Maps pin or marked route required in actual reportGeographic context
Sloping-ground lineSeparate verified pin or marked route required in actual reportTerrain/setup context
L-01, L-02, S-01, S-02Field station identifiersSurvey record; map pins do not replace measured control

This illustrative report does not publish fictional WGS84 coordinates. Actual submissions must insert the group's verified location points.

C — Photo Documentation — Dedicated Page

Reserve one complete report page for the embedded original images represented by this register.

PhotoImage FileDescription
1FW02-photo-01.jpgLevel-ground line ranged between L-01 and L-02
2FW02-photo-02.jpgFull-tape placement with head and rear tape persons aligned
3FW02-photo-03.jpgHorizontal stepping and plumb transfer on the sloping line
4FW02-photo-04.jpgRecorder preserving forward and reverse readings

IV — Observations and Data

A — Level-Ground Raw Observations

RunFromToFull Tape (m)Remainder (m)Observed Distance (m)Status
ForwardL-01L-0230.00029.84259.842Raw / retained
ReverseL-02L-0130.00029.83659.836Raw / retained

B — Sloping-Ground Raw and Reduced Data

Measured elevation difference: 3.240 m.

RunRaw Slope Distance, S (m)Elevation Difference, h (m)Computed Horizontal Distance, H (m)H − S (m)
142.6803.24042.556842-0.123158
242.6763.24042.552830-0.123170

C — Computed Data and Quality-Control Record

QuantityResult
Level-line mean horizontal distance59.839 m
Level-line discrepancy0.006 m
Level-line relative precisionapproximately 1:9,970
Mean slope distance42.678 m
Mean reduced horizontal distance42.555 m
CheckResultStatus
Forward/reverse raw observations retainedYesChecked
Elevation difference independently recorded3.240 mChecked
Raw slope and reduced values separatedYesChecked
Unsupported corrections introducedNoChecked
Pedestrian crossing managed safelyYesChecked

V — Computations and Assumptions

Level-ground mean, discrepancy, and relative precision:

D‾=59.842+59.8362=59.839 m\overline{D}=\frac{59.842+59.836}{2}=59.839\text{ m} ΔD=∣59.842−59.836∣=0.006 m\Delta D=|59.842-59.836|=0.006\text{ m} Relative precision=59.8390.006=9,973.2≈1:9,970\text{Relative precision}=\frac{59.839}{0.006}=9{,}973.2\approx 1:9{,}970

Representative sloping-line reduction:

H1=42.6802−3.2402=42.556842 mH_1=\sqrt{42.680^2-3.240^2}=42.556842\text{ m} H2=42.6762−3.2402=42.552830 mH_2=\sqrt{42.676^2-3.240^2}=42.552830\text{ m} Hmean=42.556842+42.5528302=42.554836 m≈42.555 mH_{\mathrm{mean}}=\frac{42.556842+42.552830}{2}=42.554836\text{ m}\approx 42.555\text{ m}

Assumptions and conventions:

  • The measured 3.240 m elevation difference applies to both independent slope-distance runs.
  • The reduced plan distance follows H=S2−h2H=\sqrt{S^2-h^2}.
  • Forward and reverse level-ground runs are independent observations.
  • No tape standardization, temperature, tension, sag, or alignment correction is introduced without supporting field data.
  • Intermediate results retain full precision; reported distances are rounded to the nearest millimetre.

VI — Remarks and Conclusions

A — Remarks

  • Pedestrian movement was controlled before the tape crossed the walkway.
  • Alignment, tape support, point transfer, and reading of the remainder are probable error sources.
  • The sloping distance was not reported directly as plan distance.
  • The reduced horizontal distance is approximately 0.123 m shorter than the mean measured slope distance.
  • Both raw runs remain available for independent review.

B — Conclusion

The accepted level-ground horizontal distance is 59.839 m, with a 0.006 m repeat discrepancy and approximate relative precision of 1:9,970. The sloping line reduces to 42.555 m horizontal distance after accounting for the measured 3.240 m elevation difference.

Example filename: `G#1-P#2-Horizontal Distances.pdf`

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