Experiment, evaluate methods of interpolation of terain surface for different types of terrain
Institute Technical Special Engineer, Military Technical Academy, Vietnam
- Keywords: Accuracy, Digital elevation model, Geographic information system, Spatial interpolation, Topography.
- Received: 15th-Feb-2020
- Revised: 16th-Mar-2020
- Accepted: 29th-Apr-2020
- Online: 28th-Apr-2020
- Section: Geomatics and Land Administration
Surface modeling is done by many classic and modern algorithms such as Polynomial Interpolation, Delaunay Triangulation, Nearest Neighbor, Natural Neighbor, Kriging, Inverse Distance Weighting (IDW), Spline Functions,... The important issue is to experiment, evaluate, and select algorithms suitable to the reality of the data and the study area. The paper used three algorithms IDW, Kriging, and Natural Neighbor to model the terrain on two map sheets representing different types of terrain. From there, compare the results and evaluate the accuracy of the methods based on random test data from the data set, which is extracted from the original map. Besides, checking the contour determined from the algorithm compared to the original contour was also carried out on the entire map sheet. Results show that: Natural Neighbor algorithm gives better results on both experimental areas, then IDW and Kriging algorithms, the root mean Square Error of 15.2922, 16.4754, and 17.9949m respectively for terrains have average high and 13.9728, 15.2466, 15.7613 meters with high mountainous terrain.
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