为了适应面广量大且需求仍在不断增长的1:5万专题调查制图的需要,我们采用数字插值放大、优化波段组合的光机复合处理技术,探索了1:5万高质量TM影像图的制作技术。本文介绍了制作1:5万高质量TM影像图的基本工艺方案及技术关键:(1)对TM图像磁带数据进行实数倍(2.28倍)双向线性插值放大,(2)在C-4500扫描仪上用50μm光点扫描获得比例尺为1:25万的潜影图像,(3)把潜影图像经显影、定影处理,再光学放大5倍,获得1:5万TM影像图。从我们结合有关任务先后在河北省南皮县、黑龙江省穆稜县和山东省莱洲湾等地区进行的试验研究看,均取得了良好效果。

In order to suit the wide, large guantative and continiously increasing needs of 1: 50,000 survey and mapping of special topics, we use th optical-computer composite processing techniques such as digital interpolation and magnifying, and optimization of band combination, the techniques of making 1:50, 000 high quality TM image have been explored. This article introduces the main steps and key techniques of making 1: 50, 000 TM image, i.e. (1) magnifying TM CCT data by real times (2.28) using interpolation method; (2) obtaining 1: 250,000 TM latent image through 50 um light-spot scanning on C-4500 Scanner; (3) creating 1:50,000 TM image by optical processing The test studies in Nanpi County, Hebei Province; Mulin County, Heilongjiang Province; Laizhou Bay, Shandong Province have achieved good results.