| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. BENCHMARK AND REFERENCE POINT ESTABLISHMENT | |||
| A1 | Primary benchmark location and stability Acceptance: BM located in stable area; permanent/semi-permanent structure; protected from damage | Cl. 3.1 — Reference point establishment | |
| A2 | Benchmark elevation verification Acceptance: RL tied to national/state grid BM; leveled twice; difference ≤ 5 mm; recorded in logbook | Cl. 3.2 — RL accuracy | |
| A3 | Secondary benchmarks and identification marks Acceptance: Secondary BMs established at intervals ≤ 500 m; marked with paint/chiseled marks; documented | Cl. 3.3 — Additional reference points | |
| A4 | Benchmark documentation and access Acceptance: BM description recorded; sketch with dimensions; GPS coordinates; accessible for future use | Cl. 3.4 — BM records | |
| B. SURVEY CONTROL NETWORK ESTABLISHMENT | |||
| B1 | Control point distribution and spacing Acceptance: Points distributed uniformly; spacing appropriate for project size; visible from all directions | Cl. 4.1 — Network coverage | |
| B2 | Control point stability and marking Acceptance: Points on stable ground; marked with pegs/concrete pillars; protected from disturbance | Cl. 4.2 — Point permanence | |
| B3 | Coordinate determination (East, North, RL) Acceptance: Coordinates determined by traverse/GPS; accuracy ±50 mm (XY), ±30 mm (Z); tied to grid | Cl. 4.3 — Positioning accuracy | |
| B4 | Traverse closure and accuracy verification Acceptance: Traverse closure ≤ 1:2000; angular closure within spec; coordinate closure acceptable | Cl. 4.4 — Network quality | |
| C. GPS / TOTAL STATION SURVEY VERIFICATION | |||
| C1 | Equipment calibration and certification Acceptance: GPS/Total Station calibrated; certificates current; accuracy specs met; setup tested | Cl. 5.1 — Instrument accuracy | |
| C2 | Field survey method and procedure Acceptance: Method documented; observations recorded; redundant measurements taken; data downloaded | Cl. 5.2 — Data collection standards | |
| C3 | Coordinate transformation and projection Acceptance: Transformation parameters documented; projection verified; scale factor applied if needed | Cl. 5.3 — Map projection accuracy | |
| C4 | Post-processing and data validation Acceptance: Data processed in professional software; outliers identified and checked; coordinate report generated | Cl. 5.4 — Data quality control | |