Boundaries – Before you start
The following table represents the absolute and relative accuracy applicable to the scale at which the product was surveyed.
| Original survey scale | 99% confidence level | 95% confidence level | RMSE* |
|---|---|---|---|
| 1:1250 | |||
| Absolute Accuracy | 0.9 m | 0.8 m | 0.5 m |
| Relative Accuracy | +/- 1.1 m (up to 60 m) | +/- 0.9 m (up to 60 m) | +/- 0.5 m (up to 60 m) |
| 1:2500 | |||
| Absolute Accuracy | 2.4 m | 1.9 m | 1.1 m |
| Relative Accuracy | +/- 2.5 m (up to 100 m) | +/- 1.9 m (up to 100 m) | +/- 1.0 (up to 100 m) |
| 1:10 000 | |||
| Absolute Accuracy | 8.8 m | 7.1 m | 4.1 m |
| Relative Accuracy | +/- 10.1 m (up to 500 m) | +/- 7.7 m (up to 500 m) | +/- 4.0 m (up to 500 m) |
*RMSE (root mean squared error) is the square root of the mean of the squares of the errors between the observations.
