CAJ | 학술논문

当今测绘领域研究较多的内容就是如何快速、高精度的测定控制点的高程。高精度的地球重力场模型被用来将GPS确定的大地高转换为正常高，以取代高劳动强度、低效率的水准测量。目前，GPS高程转换较为普遍的做法是根据已掌握的GPS控制网高程数据，应用EGM2008模型求出点位高程异常进而推算出网内各点的正常高。结合工程实例中对GPS高程控制网的试算，对上述GPS高程转换所达到的精度进行了分析，证实此方法可以达到四等水准的精度。
당금측회영역연구교다적내용취시여하쾌속、고정도적측정공제점적고정。고정도적지구중력장모형피용래장GPS학정적대지고전환위정상고，이취대고노동강도、저효솔적수준측량。목전，GPS고정전환교위보편적주법시근거이장악적GPS공제망고정수거，응용EGM2008모형구출점위고정이상진이추산출망내각점적정상고。결합공정실례중대GPS고정공제망적시산，대상술GPS고정전환소체도적정도진행료분석，증실차방법가이체도사등수준적정도。
Measuring elevation of the control points with speed and precision is the most popular research in the survery-ing field today .The high-precision earth gravitational field model is widely used in transforming geodetic heights measured by GPS to orthometric heights , in order to replace labor-intensive and inefficient differential leveling . Currently , the common practice in GPS elevation transformation is obtaining the height anomalies of the control points and then calculat-ing the orthometric heights based on EGM 2008 model by using elevation data of GPS control network .In the trial calcula-tion of GPS control network in eixsting engineering projects ,the accuracy of the GPS elevation transformation method pro-posed here was analysed .The result verifies that this method can reach the fourth grade of leveling accuracy .