What does above ground level mean?

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Tags

1. #respect
2. #sciences
3. #aviation
4. #broadcasting
5. #broadcast
6. #terrain
7. #surface
8. #atmospheric
9. #measured
10. #average
11. #height
12. #altitude
13. #underlying
14. #ground
15. #elevation
16. #above
17. #engineering
18. #level
19. #opposed