Key to data types Click on an icon to find out more information about this data type
Passive
| Airborne multispectral |  | Satellite multispectral |  | Airborne hyperspectral |  | Satellite hyperspectal
| Airborne photography |  | Fine pixel size |  | Medium pixel size |  | Coarse pixel size
Active
| Airborne radar |  | Airborne laser |  | Satellite radar |  | Underwater acoustics
Field based
| Boat based visual |  | Diving visual |  | Snorkelling visual |  |
Symbols
$ | Operational but costly | ? | Feasible but not operational | E | Possible if the extent is bigger than several pixels |  |
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