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Table 1.
Comparison of nulls locations and types obtained using the trilinear and Poincaré index methods to the true locations and types, for two different grid resolutions.
| Null # | Type | x | y | z | Type | x | y | z | Type | x | y | z |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 203 | Trilinear | Poincaré | Exact (2 d.p.) | |||||||||
| 1 | B | 0.30 | −0.25 | −1.49 | − | − | − | − | Bs | 0.30 | −0.25 | −1.48 |
| 2 | A | 0.04 | −0.00 | −0.01 | As | −0.08 | −0.08 | −0.08 | As | 0.05 | 0.00 | −0.01 |
| 3 | A | 2.90 | −0.16 | −0.57 | A | 2.89 | −0.41 | −0.41 | A | 2.87 | −0.19 | −0.60 |
| 4 | 0 | 2.95 | −0.17 | 0.17 | As | 2.89 | −0.08 | −0.08 | Bs | 2.97 | −0.15 | 0.22 |
| 5 | A | 3.29 | 0.10 | 0.40 | As | 2.89 | −0.08 | 0.25 | As | 3.23 | 0.06 | 0.25 |
| 6 | B | −0.20 | 3.31 | 0.42 | − | − | − | − | Bs | −0.21 | 3.32 | 0.44 |
| 7 | B | −0.28 | 0.25 | 1.26 | Bs | −0.41 | 0.25 | 1.24 | Bs | −0.27 | 0.24 | 1.25 |
| 8 | A | 3.14 | 3.14 | −0.04 | A | 3.22 | 3.22 | −0.08 | A | 3.14 | 3.13 | −0.04 |
| 9 | A | 0.02 | −0.02 | 3.22 | As | −0.08 | −0.08 | 3.22 | As | 0.02 | −0.02 | 3.21 |
| 10 | − | − | − | − | − | − | − | − | Bs | 3.32 | 0.15 | 2.99 |
| 11 | A | −0.00 | 3.14 | 3.17 | As | −0.08 | 3.22 | 3.22 | As | −0.00 | 3.14 | 3.17 |
| 12 | − | − | − | − | − | − | − | − | As | 3.31 | 0.15 | 3.25 |
| 13 | B | 2.95 | −0.13 | 3.61 | Bs | 2.89 | −0.08 | 3.55 | Bs | 2.99 | −0.10 | 3.50 |
| 14 | B | 3.02 | 3.01 | 3.38 | B | 2.89 | 2.89 | 3.22 | Bs | 3.02 | 3.02 | 3.39 |
| − | − | − | − | − | Bs | 2.89 | −0.08 | −0.41 | − | − | − | − |
| 803 | Trilinear | Poincaré | Exact (2 d.p.) | |||||||||
| 1 | B | 0.30 | −0.25 | −1.48 | Bs | 0.30 | −0.26 | −1.45 | Bs | 0.30 | −0.25 | −1.48 |
| 2 | A | 0.05 | −0.00 | −0.01 | As | 0.06 | −0.02 | −0.02 | As | 0.05 | 0.00 | −0.01 |
| 3 | A | 2.86 | −0.19 | −0.60 | A | 2.84 | −0.18 | −0.58 | A | 2.87 | −0.19 | −0.60 |
| 4 | B | 2.98 | −0.15 | 0.23 | B | 3.00 | −0.18 | 0.22 | Bs | 2.97 | −0.15 | 0.22 |
| 5 | A | 3.23 | 0.06 | 0.25 | As | 3.24 | 0.06 | 0.22 | As | 3.23 | 0.06 | 0.25 |
| 6 | B | −0.21 | 3.32 | 0.44 | Bs | −0.18 | 3.32 | 0.46 | Bs | −0.21 | 3.32 | 0.44 |
| 7 | B | −0.27 | 0.24 | 1.25 | Bs | −0.26 | 0.22 | 1.25 | Bs | −0.27 | 0.24 | 1.25 |
| 8 | A | 3.14 | 3.13 | −0.04 | A | 3.16 | 3.16 | −0.02 | A | 3.14 | 3.13 | −0.04 |
| 9 | A | 0.02 | −0.02 | 3.21 | As | −0.02 | −0.02 | 3.24 | As | 0.02 | −0.02 | 3.21 |
| 10 | B | 3.32 | 0.15 | 3.00 | Bs | 3.32 | 0.14 | 3.00 | Bs | 3.32 | 0.15 | 2.99 |
| 11 | A | −0.00 | 3.14 | 3.17 | As | −0.02 | 3.16 | 3.16 | As | −0.00 | 3.14 | 3.17 |
| 12 | A | 3.31 | 0.15 | 3.24 | As | 3.32 | 0.14 | 3.24 | As | 3.31 | 0.15 | 3.25 |
| 13 | B | 2.99 | −0.10 | 3.51 | Bs | 3.00 | −0.10 | 3.48 | Bs | 2.99 | −0.10 | 3.50 |
| 14 | B | 3.02 | 3.02 | 3.39 | Bs | 3.00 | 3.00 | 3.40 | Bs | 3.02 | 3.02 | 3.39 |
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