| S.No. | Field / Checkpoint | Reference | Status |
|---|---|---|---|
| A. TRAVERSE DETAILS | |||
| A1 | Traverse name + closed / open / link traverse type Acceptance: Type identified | Per survey | OK NC NA |
| A2 | Total Station + accuracy class + calibration cert Acceptance: Per accuracy | 1-sec / 5-sec / 10-sec class | OK NC NA |
| A3 | Date + survey crew + weather Acceptance: Logged | Per field session | OK NC NA |
| B. STATIONS + READINGS | |||
| B1 | Station ID + back-sight + fore-sight + included angle Acceptance: Per accuracy class | Read to instrument precision | OK NC NA |
| B2 | Distance (slope + horizontal) + height of instrument Acceptance: Per device | EDM measurement | OK NC NA |
| B3 | Coordinates computed (X, Y, Z) per station Acceptance: Per software / manual | Forward computation | OK NC NA |
| C. CLOSURE + ADJUSTMENT | |||
| C1 | Angular closure check (sum of interior angles) Acceptance: ± 10" × √n typical | Theoretical = (n-2) × 180° | OK NC NA |
| C2 | Linear closure (start - end coords for closed traverse) Acceptance: Per accuracy class | ≤ 1:5000 to 1:10000 typical | OK NC NA |
| C3 | Bowditch / least-squares adjustment Acceptance: Adjusted coords | Distribute closing error | OK NC NA |
A traverse is a series of connected lines (bearings + distances) used to establish positions in a survey. Closed traverses (start + end at the same point) provide self-checking — the closure error reveals accuracy.
For highway / metro / large infrastructure projects, traverses establish the control network on which all detailed surveying depends. The Traverse Register is the formal record of each leg's measured bearing + distance + computed coordinates + closure verification.
Without this register, traverse data is in surveyor's notebooks; never formally reconciled; no audit trail for project's geometric integrity.
Closed traverse from known control points: 1. Set up at starting control point (known coordinates) 2. Backsight to second known point (orientation) 3. Measure forward bearing + distance to next station 4. Move to next station; backsight + forward sight 5. Continue around the loop 6. Close back to starting point or another known control 7. Compute closure error: should be < 1:5,000 for ordinary survey; < 1:10,000 for precision
Register entries per leg: - Station from + to - Measured horizontal angle + distance - Computed bearing + computed coordinates - Adjustment correction (per Bowditch or similar) - Final adjusted coordinates - Notes on field conditions + observations
Equipment: Total station + prism + tripod + RTK GPS (modern); or theodolite + chain + electronic distance meter (older).
Acceptance: closure error within tolerance; adjustment applied; final coordinates accepted into Control Point Register.
1. Insufficient closure — error > tolerance; cannot use without adjustment OR re-survey. 2. Random check missed — single occupational check only; systematic errors invisible. 3. Backsight orientation wrong — instrument set-up correct but pointing to wrong reference point. 4. No adjustment — raw measurements used directly; errors accumulate. 5. Different datum used — mixing WGS-84 and Indian grid datum; coordinates inconsistent. 6. No archival — register data not preserved; impossible to reconcile later. 7. Calibration certificate expired — instrument accuracy unknown; questionable survey results.
Companion formats: - Control Point Register (FMT-SUR-001) — coordinate baseline - Total Station Reading Sheet (FMT-SUR-003) — daily survey output - Cross Section Format (FMT-SUR-005) — cross-sections
References: - IRC SP 19:2001 — Manual on Highway Surveys - Survey of India Standards — geodetic + control survey procedures - NICMAR + IIT geomatics curricula — academic best practices - GPS surveying: WGS-84 / Indian Geodetic Datum - Indian Standards for Surveying (relevant IS codes for surveying instrumentation)