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| | surveying. The Columbia Encyclopedia, Sixth Edition. 2001-05 (Site not responding. Last check: ) |
 | | Land surveying includes both geodetic surveying, used for large areas and taking into account the curvature of the earths surface (see geodesy), and plane surveying, which deals with areas sufficiently small that the earths curvature is negligible and can be disregarded. |
 | | Branches of surveying are named according to their purpose, e.g., topographic surveying, used to determine relief (see contour), route surveying, mine surveying, construction surveying; or according to the method used, e.g., transit surveying, plane-table surveying, and photogrammetic surveying (securing data by photographs). |
 | | Surveys based on photographs are especially useful in rugged or inaccessible country and for reconnaissance surveys for construction, mapping, or military purposes. |
| www.bartleby.com /65/su/surveyin.html (680 words) |
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