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Comparative study and error analysis of digital elevation model interpolations |
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| Authors: | CHEN Ji-long WU Wei and LIU Hong-bin |
| Institution: | 1. Collge of Computer and Information Science, Southwest University, Chongqing 400716, P.R.China;College of Resource and Environment,Southwest University, Chongqing 400716, P.R.China 2. Collge of Computer and Information Science, Southwest University, Chongqing 400716, P.R.China 3. College of Resource and Environment,Southwest University, Chongqing 400716, P.R.China |
| Abstract: | Researchers in P.R.China commonly create triangulate irregular networks (TINs) from contours and then convert TINs into digital elevation models (DEMs). However, the DEM produced by this method can not precisely describe and simulate key hydrological features such as rivers and drainage borders. Taking a hilly region in southwestern China as a research area and using ArcGISTM software, we analyzed the errors of different interpolations to obtain distributions of the errors and precisions of different algorithms and to provide references for DEM productions. The results show that different interpolation errors satisfy normal distributions, and large error exists near the structure line of the terrain. Furthermore, the results also show that the precision of a DEM interpolated with the Australian National University digital elevation model (ANUDEM) is higher than that interpolated with TIN. The DEM interpolated with TIN is acceptable for generating DEMs in the hilly region of southwestern China. |
| Keywords: | digital elevation model (DEM) interpolation triangulate irregular network (TIN) Australian National University digital elevation model (ANUDEM) |
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