| Survey name | Type | Altitude | Spacing | Flight line distance |
|---|---|---|---|---|
| Central New Hampshire '68 | M-Dz | 1524 m (barometer) | 0.80 km | 1,561 km |
| Central New Hampshire | M-Dz | 914.4 m (barometer) | 0.80 km | 5,132 km |
| Portland | M/R-D | 121.9 m | 8.00 km | 989 km |
| Portland Detail | M/R-D | 121.9 m above ground | 2.00 km | 643 km |