Subject
- Population1
- Power generation sites1
- Power plants1
- Racetracks1
- Railroads1
- Recreation areas1
- Refuse and refuse disposal1
- Reservoirs1
- Roads1
- Sewage disposal plants1
- Sports facilities1
- Storage tanks1
- Swamps1
- Trails1
- Trees1
- Tunnels1
- Vegetation and climate1
- Vegetation classification1
- Vegetation mapping1
- Waste disposal sites1