数字地形分析中适宜分析窗口选择方法的评价

发布时间：2018-07-15 12:33

【摘要】：基于栅格DEM(digital elevation model)计算局域地形属性时,所采用的分析窗口将直接影响数字地形分析结果,因此在实际应用中应选择适宜分析窗口。由于地形条件是随空间变化的,因此随空间变化的适宜分析窗口应比通常所用的全局固定的3×3窗口更为合理。目前通过定量计算获得随空间变化适宜分析窗口的方法是多窗口局部地表形态刻画法。选用3个具有不同地形特征的研究区,在不同分辨率下分别将坡度、剖面曲率用于该方法来确定适宜分析窗口,对实验结果进行分析评价。结果表明,当利用不同地形信息时,所得的适宜分析窗口情况明显不同。进一步的实验分析发现,与传统所用的全局固定3×3窗口相比,该方法所识别出的随空间变化的适宜分析窗口结果对于实际应用结果没有明显差别。因此该方法有效性存疑,尚不能作为确定适宜分析窗口的有效方法,还需进一步开展方法研究,以设计出合理有效的方法来识别随空间变化的适宜分析窗口。
[Abstract]:When calculating local terrain properties based on grid Dem (digital elevation model), the analysis window used will directly affect the results of digital terrain analysis, so the suitable analysis window should be selected in practical application. Because terrain conditions vary with space, the suitable analysis window with spatial variation should be more reasonable than the commonly used 3 脳 3 window. At present, the multi-window local surface shape description method is obtained by quantitative calculation. Three study areas with different topographic characteristics were selected and the slope and profile curvature were used to determine the suitable analysis window at different resolutions. The experimental results were analyzed and evaluated. The results show that the suitable analysis window is obviously different when different terrain information is used. Further experimental analysis shows that compared with the traditional global fixed 3 脳 3 window, the suitable analysis window results with spatial variation are not significantly different from the practical application results. Therefore, the validity of this method is doubtful and can not be used as an effective method to determine the appropriate analysis window, and further research is needed to design a reasonable and effective method to identify the suitable analysis window with spatial variation.
【作者单位】：西安地图出版社;中国科学院地理科学与资源研究所资源与环境信息系统国家重点实验室;中国科学院大学资源与环境学院;江苏省地理信息资源开发与利用协同创新中心南京师范大学地理科学学院;
【基金】：国家自然科学基金(41422109,41431177)~~
【分类号】：P208;P217

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