为了提高露天煤矿正射影像大规模栅格数据集的处理效率,优化矿区地理信息系统底图显示效果,提出运用地图切片技术处理矿区栅格数据。对无人机正射影像的栅格数据进行网格切片,根据使用需求实现局部快速加载;同时,利用基于前台的实时影像坐标转换算法,实现不同坐标系统下的数据自动叠加。并在哈尔乌素露天煤矿应用了正射影像切片技术,结果表明:全部加载矿区65km2范围的11.8GB影像耗时约为20min,使用地图切片技术处理,根据显示位置与缩放等级局部加载,每次仅需加载7.5MB数据,单次地图缩放或平移操作的响应时间0.75s。

In order to improve the processing efficiency of orthophoto large-scale raster data set of surface mines, optimize the display effect of mining area geographic information system base map, we propose a map tile technology to process raster data of surface mines. Construct slice grid for raster data collected by unmanned aerial vehicle, slice and realize local fast loading according to requirements: at the same time, with real-time image coordinate conversion algorithm based on the foreground,data under different coordinate systems are automatically superimposed to realize multi-system fusion. Taking Haerwusu Open-pit Mine as an example, the orthophoto map tile technology was applied. The complete loading time of the 65 km2 image of the mine area is about 20 minutes, and the response time of a single map zooming or panning operation is 0. 75 seconds when loading the same image as above using map slicing.