|Ph.D Student||Jarroush Jad|
|Subject||Geodetic Aspects of the Future Cadastre|
|Department||Department of Civil and Environmental Engineering||Supervisor||Professor Gilad Even-Tzur|
|Full Thesis text - in Hebrew|
A Cadastre is defined as a system used for registering land parcels and titles, and managing related information, such as size, boundaries, ownership and possible debts.
Many countries have recently initiated steps to go from the Analogue Cadastre system to the Legal Digital Cadastral system (LDC). Unlike the Analogue Cadastre, the main principle underlying the LDC is definition of the cadastral parcel shape and position by means of point coordinates in the national grid. In the LDC, mathematical coordinates replace the physical marking of boundary points used in the Analogue Cadastre system.
The future cadastral system would use Active Permanent GNSS Networks (APN) as the basis for the national grid. This would have has several advantages relating to greater and more homogenous accuracy, which would reveal ground surface deformations.
If there are ground deformations, such as movement between tectonic plates, the boundary point coordinates in the LDC database might no longer describe the correct field position, giving rise to cadastral problems. This research examines an example of such a situation. A simulation was carried out with the aim of reinstating the cadastral parcel boundary process, based on Israel’s APN. Israel was chosen because it is located on two tectonic plates with minor relative movement between them, and the results would therefore not only apply to places where significant surface deformations occur.
A possible solution for solving this geodetic issue, based on defining a highly accurate Legal Dynamic Digital Cadastral (LDDC) system, is proposed. The points in the database of the proposed system would be 2- or 3-dimensional grid coordinates, with time as additional dimension, the accuracy of which would be defined relative to the APN. The research also details the geodetic components required for creating the proposed LDDC system and database. Various specific implementation recommendations are made. For example, a model for monitoring grid- coordinate changes is proposed as an essential geodetic component of the system. The mathematical relationship required between the proposed model and other geodetic cadastral components in Israel’s cadastre, using cadastral task simulations, is described. Finally, the role of the national cadastral agency in implementing the proposed LDDC system and in legalizing the database based on surveyors’ regulations is pointed out.