| Summary: | 碩士 === 國立臺灣海洋大學 === 河海工程學系 === 97 === In this investigation we adopted the Kriging method to estimate topography in beach zone in order to save the working time and be efficiently. Before the Kriging method, we must know what kind of the data variogram model is in our interest area. Thus, we performed the variogram model and provide the results to the following Kriging procedure. As a consequence, the topography of interest area could be obtained completely. Besides, the field data was obtained by LiDAR. The LiDAR data are compared with these of estimating by Kriging method to realize the performance of Kriging method in beach topography estimation.
The results indicate that the variogram model is similar to Gaussian model. The results also show the variogram model in the direction of parallel the contours in interest area converge very well. Undoubtedly, the more accurate estimated results should be obtained in the direction mentioned above.
Furthermore, we examined the accuracy of those from Kriging method by using two indices. When 95% examining points that the discrepancies between LiDAR and Kriging data are less than ±25cm, thus we define the estimation is qualified. The results of exanimations indicate that the number of points and distribution of data would affect the estimation of Kriging method evidently. We concluded that in the beach surveying works by total station and estimating by Kriging method the spacing between surveying profiles and measured points on profiles should be less than 20m and 10m, respectively.
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