| Although many researchers have developed three-dimensional GIS prototypesystems, made three-dimensional GIS technology resource management in manyareas, such as digital ocean applied, and traditional GIS software now comes withsome three-dimensional performance modules, but they have some disadvantagessuch as poor integration with three-dimensional modules. Additionally, GIS softwarefor three-dimensional terrain performance is mainly for marine disasters, such asbad performance of coastal waters torrent tide evolution, the evolution of the disastercan not realistically reproduce the process.Meanwhile, marine disasters, rapid data processing methods are still scarce, thetraditional processing methods such as the analysis of historical data mining disasterare mostly after the disaster. Due to such characteristics as the variability of marinedisasters and multidimensional data from multiple sources, even marine disasters inthe same area, a lot of uncertainty because of the new disaster occurs, so that theresults of the analysis of historical data generated by the new mining disastersdecision support effect becomes very limited. Furthermore, the current3D displayproblems still exist: new platform, heavy workload, the accuracy is not high, lowbandwidth environment in BS Three-dimensional display need to be loaded for a longtime, including WEB, PC, mobile phones, Tablet PC and other platforms show cannotbe achieved.To solve these problems, the paper optimized the simulation of strange tide waterlevel changing law and constructed the3D virtual scene, according to the timesequence for fast batch processing, the use of multi-objective optimal Skyline queryto filter the data in each batch which are screened serious and non-serious disasterobservation points, superimposed on the area map, even though the occurrence of the disaster still has not been completed, it is possible to in accordance with acquiringdisaster data to divide the serious disaster zone and non-serious disaster zone, tominimize the losses of property.This paper presents a maritime scene in the fifth chapter of reproductioninstances systems and optimization techniques used in massive terrain visualizationand dynamic visual field of the tide and regional disaster partitioning strategy used inmarine attribute data in this example, filtering each time batch of data which delegatethe serious disaster zone and non-serious disaster zone to overlap to the disaster areamap.The system uses Unity3d as big scene simulation platform that can be compiledinto applications on different platforms, including the Web, Android, ios and otherplatforms can be compatible, and to achieve a good visual expression of simulationresults, real-time simulation of the strange tide process, having a good effect to assistto establish the strategy of alleviating disaster. |
