Abstract
A displacement monitoring system has been developed using the Global Positioning System. It has been applied to large slopes of limestone quarries, landslide slopes to monitor the slope stability. The system can measure the three dimensional displacements continuously and automatically. The accuracy of measurements is beyond the standard one of the GPS by applying the trend model to the measurement results.
This paper focuses on two topics. One is long-term continuous monitoring and the other is monitoring under the condition of the high height difference between the measurement points. The errors and the periodic characteristics of the measurement results are discussed through case studies. And then the standard deviation is shown in the relation to the distance and the height difference between measurement points. It will be available for planning the displacement measurement using GPS.
