Construction and Application of 3D Cadastre Management Model Based on LADM

Abstract

Under the three-dimensional(3D) tendency in land-use,the two-dimension(2D) cadastre management model can not reflect the land-use of the vertical space and the property.It is essential to introduce the 3D cadastre management model.The previous scholars didn't put the relation between people,right and land administrative unit into consideration.This article analyzed the core classes of LADM in ISO/TC211,including LA_Party,LA_RRR,LA_BAUnit and LA_SpatialUnit,and their relationship.LADM get a thought of constructing administration units and space units separately.This allows for a separate introduction in LADM of the legal/administrative part(the registers) and of the part(the cadastral map),e.g.first the registers,then the map.Considering the framework of LADM's core classes and the design concept of it,choosing a hybrid solution of combined 3D cadastre and 2D cadastre,the 3D cadastre concept model which is suitable for the current situation in China was proposed.In this model,the basic administrative unit consists of 2D and 3D entity of right,and the spatial unit consists of 2D space object and 3D space object,so there is a relationship of one-to-one between them.In order to meet the management need of land's spatial right,the model introduced the core class LA_SpatialUnit which covers building units,networks and other 3D cadastre forms.And based on facial model theory and the object-oriented thought,the data model of spatial unit was constructed.According to the concept model and spatial data model of the 3D cadastre,the 3D cadastre management model was designed and its prototype system was developed to verify the model's feasibility.Through the instance of the management of house property right units in Shenghe garden district and underground land parcel which locates in a commercial district,the model is confirmed to be viable in the 3D cadastre management in our country.