Research On 3D Visualization System Of Tian Jin Harbor Based On SkyLine

As for the progressive development of Tianjin Harbor in the big data era, how to confront the current situation of traditionally scattered data set and relatively backward two-dimensional display mode, and solve the problems like low quality of service, poor real-time performance, serious waste of resources, high operation and maintenance costs and so, have become an urgency. And the core of the problem could be summarized as follows: 1.how to fuse different spatial data from multi data source 2.how to integrate spatial data and non-spatial data 3.how to deal with the data interpretation after fusion. In order to address the problems above, the essay proposes a brand new data-sharing framework called GDF4 GIS to deal with harbor data and designs and implements a three-dimensional WebGIS visualization system based on GDF4 GIS. The main research work is as follows:1.a service-oriented data fusion model for heterogeneous spatial harbor dataIn order to address the first problem mentioned above, this paper proposes a spatial data fusion model by making full of GML, which, taking consideration of diversity of spatial data formats in mainstream and the independence of platform and inheriting the traditional Web service model, creatively applys data transformation in data fusion with GML. In the approach, we proposes a brand new way to construct framework with modules sharing different roles and gives a standard output interface after fusion.2.a service-oriented data fusion model for spatial data and non-spatial dataIn order to address the second problem mentioned above, this paper proposes a XML-based spatial data fusion model to fuse spatial data and non-spatial data. Quite different from traditional approach of applying format transformation in fusion, our approach, thanks to XML’s tolerance of different data formats, directly applies data packaging, merging and reconstruction instead of data transformation, thus avoiding huge cost and mul-operations of transformation.3.a distributed data interpretation modelIn order to address the third problem mentioned above, this paper proposes a distributed data interpretation model to present fused data. In our approach, we creatively apply MapReduce from big data analysis to launch Map operation after XML parsing and to process Reduce operation after distributed data procession, thus independently present different data in a unified way in the client browser.4.a service-oriented three-dimensional visualization system of Tianjin Harbor based on networkIn order to address the fourth problem mentioned above, this paper proposes a service-oriented three-dimensional visualization system of Tianjin Harbor based on network based on GDF4 GIS, which consists of data layer, service layer and application layer, where spatial data and attributive data are stored independently in distributed databases, and different business data is stored separately according to demands. In the service layer, which is the core of the system, data fusion takes place to form the 3D scene of the harbor while fused data are presented in the application layer. In the implementation of Chapter Five, we propose serveral application innovation by realizing ship dynamic tracking and other system functions through programming with SkyLine API.