【摘要】 采用新编《系列世界地图》成果,结合GIS和计算机网络技术,于2004年11月首次实现了我国南极考察“雪龙”船航迹的网上实时跟踪服务。本文详细论述了“实时航迹图”的投影转换原理、图幅坐标与屏幕坐标的映射、航迹线剪裁、网上建立“实时航迹图”及利用可视化组件实现网上“实时航迹图”web应用几个关键技术问题,并给出了解决这些问题的具体方法。更多还原

【Abstract】 Combining the production of ‘the Series of World Map’ with the technique of GIS and computer network, the real-time tracking service of Xuelong Ship of Antarctic Expedition are firstly realized in November, 2004. In this article a few key questions are dissertated in detail, such as the theory of projection transformation, mapping of the map coordinates and screen coordinates, clipping of track line, of real-time track map, and the building up and applying of real-time track map on the net using visual subassembly. The concrete methods are put forward to settle these issues.更多还原