Design And Implementation Of Non - Point Source Pollution Simulation Space - Time Database Management System Based On MongoDB In Dianchi Lake Basin

In view of the demand of the Non Point Source Pollution Emergency Response and Simulation of land use change in Dianchi River Basin, in-depth analysis of the characteristics of natural and human multi-dimensional spatio-tempor processes,paper studies the establishment of spatio-temporal data model. Firstly, the existing spatio-temporal data model based on the established database model has much shortcomings, at the same time, spatio-temporal data model document of type is designed based on non relational database, in order to effectively organize, storage and manage spatial data. Then designing a temporal database management system, to achieve importing and exporing different sources, formats of data, and provide efficient query and spatial data management and maintenance functions. At the same time as the other systems or models such as the Dianchi basin non-point source pollution spatial process simulation demonstration system, SWMM, SWAT, ABM, cyanobacteria bloom early warning simulation module, chlorophyll inversion simulation and provide data support and interface of emergency response.In this paper, the specific work is as follows: 1) according to the characteristics of spatial and temporal process of non point source pollution simulation in Dianchi watershed, design of spatio-temporal data model based on relation database design. 2) through the establishment of spatio-temporal data management system, reference GDAL/OGR data conversion library, the realization of the vector, raster data, sensor data, GPS data import and export of spatio-temporal database. 3) implementation of spatio-temporal data, delete, change, check the increase of common data editing function. Advanced operation of temporal data, such as aggregation and Map Reduce operation. Through the creation of index of spatio-temporal data, to improve the spatial data access and query speed. Realization of database backup and recovery function, maintenance and management of database. Study of Replica Sets 4) and Sharding chip technology, non-point source pollution simulation of temporal and spatial database using the replica set and the slice technique combined with the deployment of distributed database cluster in Dianchi River basin.To provide a good platform for the application of storage and management of spatio-temporal data, simulation and emergency response system for spatio-temporal data supporting spatial and temporal process of non point source pollution in Dianchi River Basin, the spatial and temporal spatial features and attributes, the integration of storage time characteristic, also has a certain value in the geographic information system software application level, can be fast and efficient queries and Map Reduce operations for spatio-temporal data, in order to achieve the user high concurrency, high availability requirements.