I — Project Details

II — Survey Team and Equipment Used

A — Survey Team

B — Equipment Used

III — Project Sketch and Photo Documentation

A — Project Sketch

Enlarge

B — Google Maps Location Points

The benchmark elevation is the engineering control. The Google Maps pin is contextual and must not be treated as the elevation source.

C — Photo Documentation — Dedicated Page

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

IV — Observations and Data

A — Raw Level Notes

B — Computed and Adjusted Elevations

C — Quality-Control Data

V — Computations and Assumptions

Arithmetic check:

$$\sum BS=6.260\text{ m},\qquad \sum FS=6.254\text{ m}$$ $$\sum BS-\sum FS=+0.006\text{ m}=100.006-100.000$$

Assigned classroom tolerance:

$$|e|_{\mathrm{allow}}=12\sqrt{0.48}=8.314\text{ mm}$$

Because $6\text{ mm}<8.314\text{ mm}$, the loop is accepted for adjustment.

Correction proportional to cumulative distance $d$ over total length $L=480\text{ m}$:

$$C_d=-e\left(\frac{d}{L}\right)$$

For TP-02:

$$C_{250}=-0.006\left(\frac{250}{480}\right)=-0.003125\text{ m}$$ $$E_{\mathrm{adj,TP02}}=100.1700-0.003125=100.166875\text{ m}\approx100.1669\text{ m}$$

Assumptions and conventions:

• BM-01 elevation is fixed at 100.000 m.
• The assigned tolerance is $12\sqrt{K}$ mm with $K$ in kilometres.
• Misclosure is distributed in proportion to cumulative route length.
• Raw elevations remain unchanged and are shown separately from adjusted elevations.
• Adjusted elevations are reported to 0.0001 m in the computation table.

VI — Remarks and Conclusions

A — Remarks

• The turning-point rod remained on the same physical point while the instrument moved.
• Parallax and level condition were checked at each setup.
• Unequal sight lengths, rod plumbing, settlement of a turning point, and reading/booking errors are probable error sources.
• No raw BS or FS reading was overwritten during adjustment.

B — Conclusion

The level loop returned to BM-01 with a raw misclosure of +6 mm, within the assigned ±8.314 mm tolerance. Proportional adjustment closes the route exactly on the known benchmark, so the adjusted elevations in Section IV are adopted for subsequent work.

Example filename: `G#1-P#3-Differential Leveling.pdf`