地理信息系统软件。功能：根据shp文件，查找卫星影像在该区域的覆盖情况，如果没有覆盖，找出确实的影像编号。-Geographic information system software. : Shp file, find the satellite imagery coverage in the region, and if there is no coverage, find out the exact image number.

卫星通信网络具有全球覆盖和固有的广播能力。为终端用户提供广播数据的解决方案。(Satellite communication networks have advantages of global coverage and inherent broadcast capabilityh and offer a solution for providing broadband access to end users.)