Criteria | Stationary test | Mobile test | Rational for selection of a HPE filter cutoff of 8 | |
---|---|---|---|---|
1 | 2 | |||
Criterion 1 | 3–15 | 3–15 | 3 | This criterion was met for stationary tests (Figure 4), but the mobile test would have required a very low HPE to attain below 1.77 m of average error as the unfiltered accuracy was lower (Figure 3). See review of the mobile test methodology in the Discussion. |
Mean ≤1.77 m | ||||
Criterion 2 | <7 | <8 | ≤15 | An HPE of 8 did not meet the criteria for stationary tests, but only 1 of 625 positions (test one) and 1 of 134 positions (test two) remained. The mobile test criteria were met. Only 2 of 45,744 positions were problematic (<0.001%) for the combined stationary tests (Figure 4). The maximum point remaining was 17.7 m error. |
Max error <15Â m | ||||
Criterion 3 | 8.5 | 6.0 | NA | The criterion was met for stationary test one, which was the longer test that covered more variable weather conditions. The HPE 8 bin only was 95% confident in an HPE of 8.25 meters for test two but the estimate was based on data calculated within each bin and few points had an HPE of >6 for test two (3% of the data), which results in a less reliable 2DRMS prediction. |
2DRMS ≤6 m | ||||
Criterion 4 | 8–10 | 3–15 | None | An HPE cutoff of 8 met the criteria for both stationary tests, and although the mobile test did not have a suitable range, the range from 5–10 was equally effective. |
Percentage incorrectly retained vs. percentage incorrectly rejected | 5–10 |