| Table A1-8. Terrain data [Excel Down] | ||||
| Area 1 | Area 2 | Area 3 | Area 4 | |
|---|---|---|---|---|
| Post spacing | 3 arc seconds | 1 arc second | 0.6 arc seconds | 0.3 arc seconds |
| Post spacing | (approx. 90 m) | (approx. 30 m) | (approx. 20 m) | (approx. 9 m) |
| Vertical accuracy | 30 m | 3 m | 0.5 m | 1 m |
| Vertical resolution | 1 m | 0.1 m | 0.01 m | 0.1 m |
| Horizontal accuracy | 50 m | 5 m | 0.5 m | 2.5 m |
| Confidence level | 0.9 | 0.9 | 0.9 | 0.9 |
| Integrity classification | routine | essential | essential | essential |
| Maintenance period | as required | as required | as required | as required |