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- Geoditic Point - A point at which the cordoinates are accurately on map - and the elevation is given.
- Orienting Table - All lines of the table are || [parallel] with the given lines on the earth's surface + with the Pl. t. land
- On Plth - 5 cm = 1 Km on ground
- 1 Mil subtends 1 meter on a distance of 1000 m.