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What is Orientation Methods in Plane Table Surveying about?

The document discusses two methods of orienting a plane table - by magnetic needle and by back sighting. The magnetic needle method uses a compass to align the table with magnetic north, but it can be inaccurate due to local magnetic attractions. The back sighting method is more accurate, where the table is turned until the line of sight bisects a ranging rod at the first survey station. Of the two methods, back sighting provides perfect orientation and is therefore the better approach.

Author

ranga

Language

EN