Subject
- Soil and civilization21
- Fuelbreaks20
- Oil storage tanks20
- Storage tanks20
- Embankments19
- Fills (Earthwork)19
- Electric lines18
- Industrial sites18
- Bridges17
- Ferries17
- Hydraulic structures17
- Pipelines16
- Refuse and refuse disposal16
- Waste disposal sites16
- Vegetation and climate15
- Vegetation mapping15
- Chimneys13
- Cooling towers13
- Windmills13
- Petroleum refineries12