orthograph

1.Our experiments show that the photogrammetry with digital camera has a better precision and the large scale topographic map and orthograph can be produced with it.

试验证明利用数码相机进行摄影测量精度很，用来测制大比例尺地形图和正射影像图。

2.The formula of the curve tangent slope at some peculiar point in the orthograph on the stereoscopic surface intersecting line and the method of making tangent are given as well.

本文过可展面的微分不变量,导出可展面的率率特征,并以锥面和切面为例阐明这些特性的几何意义。