Table 1
Performance results for the enhanced vorticity and the vorticity strength method based on tests with artificial vortex flows superimposed on a “realistic” simulated flow field.
| Enhanced vorticity method | Vorticity strength method | ||||||
| D 0 | 200 km | 400 km | 1000 km | 200 km | 400 km | 1000 km | |
|
|
|||||||
| Number of detected events | 1714 | 1659 | 955 | 1802 | 1205 | 828 | |
| Detection rates [%] | 86.9 | 72.4 | 95.0 | 99.9 | 99.9 | 99.9 | |
| Vortex position | – Overall accuracy [%] | 77.5 | 53.6 | 20.2 | 96.0 | 95.5 | 98.4 |
– Mean offset ( ) [km] |
22.5 | 92.8 | 399.0 | 4.0 | 8.9 | 8.0 | |
| Vortex diameter | – Overall accuracy [%] | 69.7 | 49.8 | 31.2 | 78.2 | 65.0 | 62.6 |
– Mean error ( ) [km] |
40.4 | 2.0 | −554.3 | 33.3 | 117.0 | 366.1 | |
Notes. The following results are compared for both methods for prescribed vortex diameters of 200 km, 400 km, and 1000 km: the number of detected vortices, the detection rate (Eq. (12)), the position accuracy (Eq. (14)), the corresponding mean position offset (Eq. (13)), the accuracy of determined vortex diameters (Eq. (17)), and the mean error in returned vortex diameter (Eq. (16)).
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