| 摘要: |
| 【目的】研究坡面微地形DEM最佳分辨率的选择方法。【方法】以2种不同复杂程度的坡面微地形（微地形简单的裸坡小区、微地形复杂的翻耕小区）DEM作为研究对象，分析不同微地形DEM分辨率下坡度中误差（mS）、地表糙度(Cr)和微地形DEM生成时间3个参数的变化，从而确定坡面微地形DEM的最佳分辨率。【结果】采用坡度中误差法可以快速缩小分辨率的选择范围，增强了后续研究的目的性；随着分辨率的变化，2种微地形DEM地表糙度的变化趋势相似，并与分辨率呈幂函数关系；综合考量地表糙度和DEM生成时间，可以确定2种微地形DEM的最佳分辨率，且在源数据相同的情况下，最佳分辨率与微地形复杂程度并不相关。【结论】裸坡小区和翻耕小区DEM的最佳分辨率均为4 mm，运用所建立方法选择微地形DEM的最佳分辨率是可行的。 |
| 关键词: 微地形 DEM 最佳分辨率 坡度中误差 地表糙度 |
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| 基金项目:陕西省水土保持局重点科技示范项目（20101003） |
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| Selection method for optimum DEM resolution of slope micro relief |
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REN Lei,LI Guang-lu,YANG Chen-hui,et al
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| Abstract: |
| 【Objective】This research aimed to find out the selection method for optimum DEM resolution of micro relief.【Method】Slope micro-relief with two different complexities (the bared plot with low complexity and the ploughed plot with high complexity) were selected to analyze the changes in three quantitative parameters including slope root-mean square error (mS),soil roughness (Cr) and time of generating the micro-relief DEM at different micro-relief DEM resolutions and select the optimum DEM resolution.【Result】mS could quickly reduce the selection range of resolution and enhance the purpose of follow-up study.The trends of Cr of two micro reliefs DEM were similar as the change of resolution with power function relationship.The optimum resolutions of 2 micro reliefs DEM could be selected by analyzing Cr and time of generating DEM.There was no relationship between the optimum resolution and micro relief complexity with same original data.【Conclusion】The optimum resolution of bared plot and ploughed plot was 4 mm.The selection method established in this study was feasible for selecting the optimum DEM resolution of micro relief. |
| Key words: Micro relief DEM optimum resolution RMSE slope surface roughness |
