前目,影像地图的成图方法主要有光学合成和制印合成两种方法。本文将简要介绍以最新的TM信息作为影像底图,编制1:20万《宝清县土地利用卫星影像地图》所采用的光学合成工艺方法。光学方法合成的影像地图,线划符号目前多用单一的留露白线或黑线,容易与影像混淆,不易分辩,且线划符号的载负量也受到限制,专题内容不突出。 Before the project, the imaging map mapping methods are two main methods of optical synthesis and printing synthesis. This article will briefly introduce the latest TM information as a base image, the preparation of 1: 200000 “Baoqing Land Use Satellite Image Map” by the optical synthesis process. Optical methods for the synthesis of image maps, line drawing symbols are currently more than a single white line or black line, easy to be confused with the image, not easy to distinguish, and the load of the line symbol is also limited, thematic content is not prominent.