Table 6 Accuracy and precision comparisons
From: High-resolution shape models of Phobos and Deimos from stereophotoclinometry
| Â | Phobos accuracy (m) | Deimos accuracy (m) |
|---|---|---|
Prediction from input images | ||
 Rule of thumb | 20–100 | 75–375 |
SPC-derived metrics | ||
 Mean maplet residual | 20 | 8 |
 Maplet formal uncertainty | 13 | 22 |
Image comparisons | ||
 Keypoint matching | 66 | 188 |
 Keypoint distance | 50 | 131 |
 Limb/terminator | 59 | 65 |
Comparison to MOLA | 21 | n/a |
Median of Accuracy Metrics | 36 | 65 |
| Â | Phobos precision (m) | Deimos precision (m) |
|---|---|---|
Prediction from input images | ||
 Rule of thumb | 5–60 | 25–300 |
SPC-derived metrics | ||
 Scaled vertex sigma | 4 | 9 |