This search shows a scheme that improve survey fiducial point in Incheon, that is mixed survey result from various origins, by GPS survey. We built new and easily maintainable 4 survey fiducial points, produced result of new points and each origin's r...
This search shows a scheme that improve survey fiducial point in Incheon, that is mixed survey result from various origins, by GPS survey. We built new and easily maintainable 4 survey fiducial points, produced result of new points and each origin's relationship by GPS survey and made those points produce consistence results.
Most fiducial point surveys by GPS are used to coordinates conversion of unification origins area. In coordinates conversion, because some of points' relationship is applied the other points, problems that don't make consistence results in Incheon where has triangular points result from various origins are predicted. Therefore, this search applied triangular net adjustment.
Appliance of triangular net adjustment extract points that coincide with known points by free network adjustment in each origin and extract other points' coordinate by adjust these points' coordinate. In this search, 68 points are used(Gari : 17, Gyeyang : 17, Central Origin : 34). For example, in Gari origin, 12 points that are mutual coincided with are extracted in 17 points and produce results of other 56 points. In the result of analysis between new result of coordinate and known coordinate, in 80% coordinates of the result of Gari and Gyeyang origins agreed within 20㎝.
By calculation of using known and newly built points' coordinate, the result of analysis between central origin's cadastral triangulation supplement points' coordinate and topographic control points' coordinate are within tolerance of cadastral law. This result gives a hint that we can get result of survey in each origins' by using newly built points and known points. The result of this research can apply control point survey as well as unification of different surveying origins.