An optimization method of DEM resolution for land type statistical model of coastal zones
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摘要: 精确翔实、三维立体、尺度适宜的地类统计数据对于海岸带自然资源监测监管和生态保护具有重要意义,地类统计模型需要数字高程模型(digital elevation model,DEM)的支撑,然而当前鲜有DEM空间尺度与统计模型的适配性方面的研究。针对于此,该文提出了一种海岸带地类统计模型中DEM空间尺度优选方法,系统探讨了DEM空间尺度对地类统计模型的影响,从统计准确性、概括性、信息量和计算效率4个角度选取指标并构建评价模型,基于熵权法确定指标权重并加权计算得到DEM最优空间尺度。研究结果表明: ①DEM采样间隔越大,对统计准确性和信息量的负向影响越明显,对信息概括性正向影响越显著; ②准确性因子对DEM精细度要求高,为满足统计精度DEM分辨率不应超过30 m,而地貌概括则要求空间分辨率不能低于10 m; ③空间操作计算时间与DEM格网数量呈线性正相关; ④基于熵权法计算权重后综合评价,最优DEM空间尺度为10 m。该文形成的DEM空间尺度优选方法在海岸带自然资源及其他调查监测地类统计中具有通用性和可扩展性。Abstract: 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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Key words:
- coastal zone /
- land type statistics /
- DEM resolution /
- information entropy /
- entropy weight method
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