地形图更新 meaning in English

revision of topographic map
revisionoftopographicmap

The experiments prove that the method of updating 3d stereo digital relief map based on digital photogrammetical mapping system is a brand new method , which has some excellent characteristics : quick working speed , shortened produce period and high accuracy
实验证明基于数字摄影测量系统的三维立体数字地形图更新，具有作业速度快、生产周期短、现势性强、精度高等优点，是一种崭新的数字地形图更新的方法。
Secondly , several methods of updating relief map are analyzed and the functionalities and characteristics of digital photogrammetrical system are introduced . combine with the task of producing 1 : 50000 basic frame map , a complete working process of updating 3d digital relief map based on " mappinstar digital mapping system " is summarized
简要介绍了数字摄影测量系统的功能和特点，结合目前1 : 5万基本框架图的生产任务，总结了一套完整的基于“ mappingstar数字测图系统”的三维立体数字地形图更新的作业方案和生产工艺流程。