The Design And Validation Of Cartographic Spatial Data Model Based On Dynamic Segmentation

Nowadays,with the acceleration of information construction,maps are an indispensable and important tool for production and life,helping people to recognize and transform the world.The basis for mapping is spatial data.Spatial data is spatial data model to organize spatial data in a hierarchical manner and describe a complex real world.In the process of map mapping,symbol semantic information is rendered through the attributes in the attribute table,and then the objective physical objects are expressed.Due to the complexity of the objective entity object,only a single symbol can be rendered through the attribute,the change relation of the semantic information of the complex entity can’t be expressed,the integrity of the spatial entity information is fragmented,and the semantic information of the mapping spatial data object and the complex spatial entity object information cannot be realized.Consistency,does not meet the concept of object-oriented.the application of dynamic segmentation technology is becoming more and more extensive.It can realize the dynamic visual expression of road features and can realize the one-to-many expression of highway elements and their attributes.Therefore,in order to solve the above problems,this paper proposes constructing drawing space based on dynamic segmentation.The data model realizes the rendering of symbolic semantic information of complex entity objects,improves the efficiency of charting,and truly achieves object-oriented effects.The model can describe various complex entity objects,which makes the rendering effect of complex entity objects consistent with people’s cognition and has good practicability,standardization and sharing.Based on the cartographic spatial data model,it provides a new concept and theoretical basis for describing complex physical objects.At the same time,based on the cartographic spatial data model,it is applied to the expression of symbol semantic information in the map space and compared with the traditional spatial data model to verify the practicality and validity of the model.It not only ensures that the original spatial data remains unchanged,but also satisfies the requirement.Cartographic requirements.The research contents of this thesis are mainly from the following aspects:(1)In order to establish the spatial data model of cartography based on dynamic segmentation,it is necessary to analyze the geo-spatial entities from the aspect of dynamic segmentation technology,to study the structural characteristics of complex entity objects and the process of cartography.The characteristics and implementation conditions of linear reference and dynamic segmentation techniques,Object-Oriented idea to describe complex entity objects,and to establish conceptual model for cartographic spatial data model.(2)According to the concept model,the mathematical model of cartographic spatial data is put forward,and the logical model is constructed by using the idea of dynamic segmentation,which is used to describe the structural relationship of cartographic spatial data objects.(3)Finally,combining with the "ocean standardization mapping system" and other specific application,using file geographical database,data object storage space,complete the physical implementation of the model,based on the c# development platform,developing environment of the ArcEngine to realize the new model to all the expression,application and management of spatial data,in order to meet the requirements of the late drawings.