| Survey name | Type | Altitude | Spacing | Flight line distance |
|---|---|---|---|---|
| Duluth | M/R-D | 121.9 m | 9.60 km | 2,259 km |
| Northeastern surveys | M-D | 150 m above ground | 0.40 km | 100,000 km |
| East-central surveys | M-D | 150 m above ground | 0.40 km | 74,000 km |
| Northwest Wisconsin | M-D | 91 m above ground | 0.80 km | 6,316 km |