How are digital elevation models created?

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Tags

1. #geographic
2. #commonly
3. #earth
4. #systems
5. #information
6. #surface
7. #relief
8. #asteroid
9. #common
10. #often
11. #planet
12. #elevation
13. #digitally
14. #produced
15. #digital
16. #model
17. #representation
18. #basis
19. #created
20. #terrain