What is loop closure in surveying?

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Tags

1. #closure
2. #themselves
3. #which
4. #itself
5. #survey
6. #point
7. #connects
8. #called
9. #surveyed
10. #exact
11. #caves
12. #perfectly
13. #should
14. #loops
15. #connect
16. #passages
17. #around
18. #circle
19. #started