Research On Online Mapping System Of Earthquake Emergency Thematic Map Based On Open Source GIS

With the development of geographic information science and the extension of Internet technology in various industries and fields,geographic information services in all walks of life to provide further application.Gi GS service is the core function of network GIS,which provides data,map display and processing service function for network GIS,and is the product of the development of map science and digital map with technology.However,in real life,due to the suddenness of various kinds of disaster accidents,the natural environment and human life have a serious impact,making emergency drawings become emergency response departments in the event of sudden disasters to obtain geographic information for command and decision-making important graphical information.Aiming at the lack of the current earthquake emergency thematic mapping platform and the insufficiency of the specification of the cartographic products,combined with the cartographic function interface of the open source geographic information system and the network geographic information system technology,the relevant cartographic theories and specifications,the mapping mode and process are studied,For the mapping mode and process design of corresponding earthquake emergency thematic maps,an online mapping system for earthquake emergency thematic maps based on the open source geographic information system has been initially developed,and the actual application and production of thematic maps has been tested.The main work of this article is as follows:(1)Analyzed the relevant technologies and theories of current online mapping,studied and analyzed the current production model of earthquake emergency maps,and proposed the technology and mapping process suitable for online mapping of earthquake emergency topics.(2)Based on the basic architecture of QGIS Desktop and QGIS Server,the earthquake emergency mapping service was designed and realized,and the interface call and data structure of the thematic map online mapping service were described in detail.(3)According to the earthquake emergency map specification,design and produce earthquake thematic map templates,and realize the template-based mapping mode.By simplifying the actual mapping process operation,a standardized and reusable mapping template library has been constructed.Provide a fast and stable emergency map production platform.(4)Realize the map service interface and system service interface on the basis of QGIS Server,complete the function call based on the cartography business,realize the function application such as loading thematic,cartographic task,printing output,content management,etc.,and visualizing the basic map data and thematic data,Verified the feasibility of online production of the thematic map of earthquake emergency in this paper through the application of examples.