| Survey name | Type | Altitude | Spacing | Flight line distance |
|---|---|---|---|---|
| Aurora | M/R-D | 121.9 m | 9.60 km | 2,666 km |
| Davenport | M/R-D | 121.9 m | 9.60 km | 2,666 km |
| East-central Iowa | M-A | 304.8 m above ground | 1.60 km | 12,070 km |
| Northwest Illinois | M-D | 548.6 m (barometer) | 4.80 km | 2,341 km |