Development of stereo GIS of Raster-type

例如，众所周知，立体航空照片比单幅图像包含更多的地理信息。在这个项目中，我们开发了一个具有立体绘图功能的栅格地理信息系统（GIS）。在原始地图和dem （digital Elevation Models，数字高程模型）的基础上制备了街道配对数字地图。我们把一张地图放在左眼的多扫描CRT的上半部分，另一张地图放在右眼的下半部分，垂直距离合适。然后将CRT的垂直同步频率加倍，并绘制出护目镜液晶快门的触发信号。该硬件系统在SVGA和XVGA窗口下运行良好。我们准备了来自不同来源的卫星图像和阴影地形图、气候数据、植被、地表地质、土地利用、人口密度等GIS内容。

It is well known that the stereo-scopic air photos, for example, contains more geographic information than the single image. In this project we developed a raster Geographic Information System (GIS) with stereo-graphic mapping functions on a remodeled CRT.The streo-paired digital maps were prepare from the original maps and Digital Elevation Models (DEMs).We put one map at the upper half part of a multi-scan CRT for a left eye, and another at the lower half part for a right eye with a suitable vertical distance. And then we doubled the vertical synchronus frequency of the CRT and drew the trigger signals for the liquid cristal shutter of goggles. This hardware system functioned successfully with SVGA and XVGA windows.We prepared the following contents of the GIS such as satellite images and maps of shaded relief, climatic data, vegetation, surface geology, landuse, population density and so on from variuos sources.