Abstract
It is allegedly possible to create a topographical map on a scale of smaller than 1:2,500 if using the latest satellite. Furthermore, satellite imagery is superior in terms of cost, time, and efficiency since it allows shooting huge areas at a time compared with an aircraft; thus it is highly expected as the next-generation method for creating a topographical map to replace the existing method with the aircraft. At present, however, due to some problems and challenges, studies and researches are made merely on the level of cases and experiments both at home and abroad, not reaching the working level yet. This study aims to formulate a method for creating a three-dimensional topographical map using satellite imagery and a method for extracting update points. Specifically, a three-dimensional measuring method is formulated using different satellite images to solve the problem of recurrence periods. In addition, a method for automatically extracting update points in the topographical map by superimposing the radar satellite images in time sequence is also formulated.
