Accuracy Improvement of Terrestrial Mobile Mapping Systems Using Triangulation Adjustment

• Main Authors: Su-WeiLin, 林舒葦
• Other Authors: Rey-Jer You
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/s6nu5v

碩士 === 國立成功大學 === 測量及空間資訊學系 === 105 === Traditionally, aerial Photogrammetry is used to do large area measurements by aerial images. However, taking images from an airplane can be so easily affected by weather that the time limitation related to taking images is very serious, and aerial Photogrammetry is also expensive. The other problem by Photogrammetry is the lack of façades of houses. Therefore, to overcome these problems, Mobile Mapping Systems (MMS) have been developed. In this article, a terrestrial MMS is used for the research. If a terrestrial MMS combines GPSs and an IMU, it can perform direct geo-referencing and then a forward intersection to determine many ground coordinates of points. However, the accuracy of results using terrestrial MMS is not stable or reliable, and thus this approach may be worse than using aerial Photogrammetry. This research introduces exterior orientation obtained from a terrestrial MMS with the help of ground control points introduced into bundle block adjustment in order to improve the positioning accuracy. The positioning accuracy will be significantly improved when we set a pair of ground control points every 60m. Using an exterior orientation from a terrestrial MMS with a pair of ground control points placed every 60m and using bundle block adjustment can raise the accuracy from 2232cm to 15cm.