目前我国各测绘部门，在生产象片图、影象线划地形图时，一般采用防潮纸遮光进行光学锒嵌，此种方法在制作起伏较大地区的影象线划地形图时，精度虽可达到要求，但工序较多。为了减少工序，我们初步试制成一种既有遮光能力又有一定透明度，可供直接透割截面曲线的遮光薄膜来进行光学锒嵌。通过多次试验表明，此种撕膜法，可减少二道工序，操作还简便，工效及精度都有所提高。在一定条件 At present, all surveying and mapping departments in our country generally use moisture-proof paper for optics embedding in the process of producing the photogrammetry and the imaging line topographic map. Although this method is used to make the topographic image of a large area, Can meet the requirements, but the process more. In order to reduce the process, we preliminarily made an opaque film with a light-shielding ability and a certain degree of transparency to directly penetrate the cross-sectional curve of the light-shielding film. Through many tests show that this tear film method can reduce the two processes, the operation is also simple, ergonomics and accuracy have increased. Under certain conditions