Fig. 5From: Stability analysis of reference station and compensation for monitoring stations in GNSS landslide monitoringCUSUM control chart. The vertical axis indicates the standard error, which is the ratio of the cumulative total to the desired standard deviation. The target means is 8.0Â mm and the target standard deviation is 3.8Â mm. The cumulative sum is highlighted when it departs from the target mean by more than five times of standard deviationBack to article page