An optimization method of DEM resolution for land type statistical model of coastal zones
JIANG Na1(), CHEN Chao2(), HAN Haifeng1
1. Shandong Provincial Institute of Land Surveying and Mapping, Ji’nan 250013, China; 2. Marine Science and Technology College, Zhejiang Ocean University, Zhoushan 316022, China
Accurate, detailed, and three-dimensional land type statistical data with an appropriate resolution is greatly significant for the natural resources monitoring, supervision, and ecological protection in coastal zones. A land type statistical model needs the support of DEM. However, there is little studies on the adaptability between the DEM resolution and the statistical model. Given this, this study proposed an optimization method of DEM resolution for land type statistical model of coastal zones. Specifically, this study systematically explored the impacts of DEM resolution on land type statistical model, selected indices and constructed an assessment model from four aspects, namely statistical accuracy, generality, information amount, and calculation efficiency. Then, this study determined the index weight using the entropy weight method and obtained the optimal DEM resolution through weighted calculation. The results are as follows. ①An increase in the DEM resolution led to the increasingly apparent negative impacts on the statistical accuracy and information amount and the increasingly significant positive effects on the generalization of the model. ②To meet the requirements of statistical accuracy, the DEM resolution should not exceed 30 m. Meanwhile, as required by the landform generalization, the DEM resolution should not be less than 10 m. ③There is a linear positive correlation between the calculation time of spatial operations and the number of DEM grids. ④Based on the comprehensive assessment using the weights calculated by the entropy weight method, the optimal DEM resolution was 10 m. The method of DEM resolution developed in this paper is universal and can be expanded in the natural resource statistics of coastal zones and in the land type statistics of other surveys and monitoring.
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