Design And Implementation Of Target Historical Data Replay System Based On GIS

In the maritime target monitoring system,multiple devices are used to monitor the trajectory and behavior of the targets.Over time,data from these devices accumulate to form huge amounts of historical data.In the historical review of the monitoring targets,the historical data of the targets need to be presented in a visual form.The existing system has achieved the storage of targets' historical data,but it's not enough for historical data playback.In the existing system,there is no visual playback of the historical multi-device monitoring data of the target,which is difficult to show the behavior information and motion state of targets during the playback period.In the existing system,there is no dynamic representation of the historical trajectory of the target.It's difficult to visualize the historical location of the target at different time during playback,unable to analyse historical behavioral trend of the target.In the existing system,there is no playback of historical data from different angles,which is can not effectively use historical data of the target to observe the overall situation of the monitoring area.In order to solve the above problems,this paper designs and implements a target history data playback system,which supports multi-mode playback,multi-dimensional information display,dynamic rendering of target track and dynamic switching between modes.Because most of the target data obtained by monitoring devices has geographical location information,this paper uses the unique advantages of GIS technology in presenting geographic information data to realize the visual presentation of target historical data.The system website is based on the lightweight Web application framework Express.The component technology is used in the system to realize multi-mode playback and multi-dimensional information display,use the characteristics of high cohesion and low coupling of components to realize dynamic switching between playback modes.In this paper,we study the method of full update and incremental update to achieve dynamic display of target track during playback,compare their performance differences and combine with actual target historical data for further optimization in order to achieve fast update of target track during playback.In this paper,in order to simulate and play back the entire course of target historical events in a vivid and intuitive way,the static target historical event data is simulated in the form of GIS animation,and the static event data is mapped into dynamic animation data through the method of data mapping.Finally,this paper conducted detailed functional tests and performance tests.The test results show that the system has availability and effectiveness.The system has been practically applied in the offshore target situation monitoring system of the laboratory.