COMPARISON BETWEEN LEAST SQUARE COLLOCATION AND ORDINARY KRIGING
Yao Daorong 1) ;Zhong Bo 2, 3) ;Wang Haihong 2, 3) ; and Wang Wei 2)
1)Logistic Support Department, Wuhan University, Wuhan 4300722)School of Geodesy and Geomatics, Wuhan University, Wuhan 4300793)Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University, Wuhan 430079
Abstract The methods of least square collocation and ordinary Kriging are introduced, and then the similarities and differences between them in the supposing condition,estimate criterion and characters of estimate value are pointed out. The performance and accuracy estimated by collocation and ordinary Kriging are compared through an example of simulated gravity anomaly data with different observation errors and data resolution. The results show that the effect of observation error on the accuracy estimated by Kriging is greater than that by collocation under the same data resolution, and the effect of data resolution on the accuracy estimated by collocation is greater than that by Kriging under the same observation error. Finally, the two prediction techniques are applied to fit the height anomaly in a local area, the result indicates that the Ordinary Kriging is also an effective method for refining the local geoid.
