Typhoon Simulation And Visualization Research Based On Cesium Platfor

China is one of the countries most affected by typhoons,with many landfalls and high landfall intensity,and is one of the countries most affected by typhoon landfalls and typhoon disasters worldwide.Visualisation is the presentation of information,knowledge,data etc.in the form of graphical images and other forms for easy visual understanding and analysis.The use of visualisation technology for typhoon simulation and modelling can visualise the movement,shape,internal structure and disaster warning of typhoons,providing technical support to relevant organisations and playing an important role in disaster prevention and mitigation.This paper uses the Cesium virtual earth platform to visualise the typhoon temperature field by the colour profile method,compares the effect of GRAPES＿Meso analysis data and forecast data when displaying the typhoon temperature field,visualises the temperature field of Typhoon Bavi in three dimensions,and proposes an improved histogram equalisation algorithm based on the histogram to improve the visualisation of the typhoon pressure field.The results of simulation experiments on typhoon Bavi data show that the colour profile method can achieve high texture clarity and better simulation effects in the visualisation of typhoon temperature fields,and the simulation results that match the real typhoon characteristics can be used as a reference method for the visualisation of typhoon temperature fields in the Cesium platform.The difference between GRAPES＿Meso forecast data and GRAPES＿Meso analysis data in the typhoon field is not significant at lower heights;at higher heights,the accuracy of GRAPES＿Meso forecast data in the typhoon field needs to be improved.Compared with the colour profile method,the mean run time of the improved histogram equalisation algorithm is142.26 ms lower than that of the colour profile method,with Sig.(two-tailed)less than 0.05,proving that the histogram equalisation algorithm runs faster than the colour profile method and is significant.The RGB values of the typhoon centroid for the improved histogram equalisation algorithm are(183,68,23)and the RGB values of the typhoon centroid for the colour profiling method are(155,192,52),indicating that the improved histogram equalisation algorithm has brighter pixel point values for the typhoon centroid than the colour profiling method;the number of centroid pixels for the colour profiling method is 169 and the number of centroid pixels for the improved histogram equalisation algorithm is 992,the improved algorithm has a larger range of centroids;the overall number of pixels for the typhoon is 1056 pixels for the colour profile method and 12765 pixels for the improved histogram equalisation algorithm,the improved algorithm has a larger overall number of pixels.The whole movement trajectory of the typhoon from formation to landing to extinction is simulated,and a typhoon warning information system based on the Cesium platform is built to dynamically show the forecast time,forecast information,typhoon path and instantaneous rainfall at the arrival of Typhoon Bavet by the meteorological stations in Zhejiang Province.The addition of functions such as path display,instantaneous rainfall and visualisation of warning information to the typhoon warning information system enables an overall layout and unified planning,providing some support for the construction of disaster prevention and mitigation systems and rescue work.In summary,this paper provides a feasible technical path and reference for the realistic reproduction of typhoons,the construction of typhoon warning information systems and the analysis of disaster situations.