关键词: 数字地球, 线型目标, 地形测量, 立体影像

Abstract:

The layered approach of linear object, such as the boundary lines for digital earth is proposed. Before linear object is divided into LOD, the intersection points of linear object and block adjacent grid at all levels need to be calculated, ether the intersection points of linear object line segment and triangle. Then how to measure terrain of Earth's surface and show is described. By calculating the rotation axis, rotation matrix and the terrain height, the calculated measure line is closed to all levels terrain triangles. Finally, the display method of red and blue stereographic images is detailed. View point focus on the left and right eye location, and GPU outputs to two texture map. GPU shader processes and outputs red and blue stereo image. The flight simulation system on digital earth, which is developed based on these technologies, provides strong support for flight training.

Key words: digital earth, linear object, terrain measure, stereographic images