Coordinate register

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The term coordinate register ( coca ) was defined in a certain way in Germany by an AdV study "Coordinate register - principles and structure" from 1985. A coordinate register is implemented when all boundary points and selected building points have location coordinates with high accuracy and reliability and these coordinates are stored in a way that is suitable for data processing. This assumes that the underlying position reference system is available with a high level of absolute accuracy (local standard deviation of the point position of max. 2 cm). The accuracy of +/- 3 to 5 cm strived for in the coordinate register can only be achieved if modern measurement technology is used. Cadastral surveys, which are now carried out with the SAPOS method, automatically lead to coordinates of coca quality due to the high level of accuracy. According to the administrative regulations in North Rhine-Westphalia , z. B. for boundary and building points a local standard deviation of the point location of 3 cm can be achieved.

The coordinate register was introduced in the nineties of the twentieth century and was only made possible by the development of modern instruments. The use of electronic total stations and GPS ( RTK measurement / SAPOS ) made it possible to increase the accuracy of the recording of measurement, boundary, building and other points accordingly. Before the introduction of electronic total stations were essentially ranging poles , measuring tapes , right angle prisms and string solders used. Nowadays it is possible to record images measured with electronic total stations , e.g. B. to be connected directly to the higher-level survey point field by means of Helmert transformation or adjustment calculation. The prerequisite for the realization of the coordinate register is that the points of this superordinate survey point field (mostly recording points) have been given coordinates with very high accuracy and reliability with the help of GPS / RTK (local standard deviation of the point position of 2 cm (administrative regulation in North Rhine-Westphalia)) .

The coordinate cadastre can only be realized by local cadastral measurements for the parcels concerned. It will take decades before the coordinate register is available across the board. The coordinate register has many advantages for surveying work on properties (cadastral surveys, site plan recordings, engineering surveys ), such as simplification and acceleration of the surveying processes and greater accuracy.

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