全球定位系統(GPS)爲全球性、全天候，24小時運作之三度空間衛星導航及定位系統，其共有24顆衛星，平均分布於6個軌道面，高度爲20200公里，呈全球3D分布，每一個時刻在任何地點至少可以接收四顆衛星訊號。自從學術界開發出載波相位干涉法測量技術之後，GPS便被大地測量及地球物理界人士，發展爲高精度點位坐標測量之新興技術。由於衛星定位技術日益精進，求出之點位坐標精度也愈來愈高，且愈來愈朝向快速定位之方向發展，不只要能定出精確之點位，更須在短時間內完成。因此決速動態測量之技術便不斷的在演進，而RTK即時動態定位測量，更成爲探討的新興主流技術。因此本研究重點乃在探討RTK即時動態定位測量技術及其應用於製作3D透視圖，藉以能完全體會出RTK即時動態定位測量在外業測量上之適用性，與內業成果的精確性，乃爲本研究之主題所在。

Global Positioning System (GPS) is the all weather, three-dimensional, 24-hour operational navigation and positioning system which is consisted of 28 satellites distributed in six orbital planes, so four satellites could be simultaneously observed to estimate the 3D position in everywhere on earth. GPS has been adopted in geodesy and geophysics researches since the interference technique generated. Over twenty years, GPS technique is towards the mature. The positioning task is more accurate and more rapid than before. Currently the real time kinematic (RTK) positioning is the most popular topic in civil and science applications. In this study, the main subject is to investigate the feasibility, effective, and efficient of RTK GPS technique in mapping project. An experimental grid was setup and RTK survey was done. The preliminary results of 3D perspective map and related evaluation were presented in this article.