Monitoring grid coordinates changes model as a base for dynamic digital cadastre system
Jarroush, Jad and Gilad Even-Tzur
In Legal Digital Cadastre (LDC) system the coordinates of the boundary points intend to be the main legal evidence in court. As long as the points are constant and the national grid parameters are immutable, the national grid coordinates of the boundary points remain stable relatively to the accuracy level declared by the LDC database. In countries with tectonic movements the coordinates of instability points discontinue describing its correct position after a specific period of time; this could be an obstacle for establishing LDC As an appropriate solution, the LDC system has to have a dynamic nature. Any dynamic system may need a continuous maintenance process over time. In LDC system, the maintenance process aims to keep the boundary point coordinates database continually updated. Fulfilling this maintenance successfully may be done by using such a monitoring grid coordinatees changes model MCCM. The main functions of MCCM are to describe the changes of the boundary pointts coordinates, and support its corrections in every era. Coordinates changes may be caused by crustal deformations as well as by any changes of the grid parameters definitions. Basically, Crustal deformations are the main cause of changing the cadastral boundary point's coordinates in the national grid. Geodetic monitoring of every boundary point may be needed to calculate the grid coordinates corrections. However, such process is not an economical solution at all. Thus, the MCCM uses the continuous observations of the permanent GPS control stations and periodic measurements of geodynamic control network, in order to predict the grid coordinates corrections of every boundary point in every period of time.
Event: XXIII International FIG Congress : Shaping the change
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