| DEM坡度的尺度效应研究 |
| |
| 引用本文： | 白天路,申佳.DEM坡度的尺度效应研究[J].工程勘察,2012(1):73-76. |
| |
| 作者姓名： | 白天路 申佳 |
| |
| 作者单位： | [1]河南省电力勘测设计院,郑州450007 [2]河南省安阳市国土资源调查规划与测绘院,河南安阳455000 |
| |
| 摘 要： | DEM的坡度是地形分析中的重要地理因子，随着DEM分辨率的降低，在其上提取的坡度会不断趋于平缓，因而不能如实表现地形起伏。本文重点研究了制图综合和采样间隔两个方面对DEM坡度的影响，利用不同分辨率DEM所提取的坡度的频率和累计频率，并对其进行分级统计，作为数据分析基础。利用制图综合和采样间隔两方面的综合效应对DEM坡度...
|
| 关 键 词： | DEM坡度 坡度衰减 坡度频率 坡度累积频率 |
The study on scale effect of DEM slope |
| |
| Bai Tianlu Shen Jia.The study on scale effect of DEM slope[J].Geotechnical Investigation & Surveying,2012(1):73-76. |
| |
| Authors: | Bai Tianlu Shen Jia |
| |
| Affiliation: | Bai Tianlu Shen Jia ( 1. Henan Electric Power Survey ＆ Design Institute, Zhenzhou 450007, China ; 2. Anyang Land Resources Investigate ＆ Survey lnstutite, Henan Province, Anyang 455000, China) |
| |
| Abstract: | DEM slope decreases along with the reduction of spatial resolution. For the purpose of investigating the attenuation of DEM slope caused by cartographic generalization and changes of sampling interval, taking Xiannangou Catchment in Ansai Shaanxi as an example, the slopes of DEM generated by 1：1000, 1：5000, 1：10000 and 1：250000 topographic digital maps are compared. After statistical analysis, we find that DEM mean slope decreased by the combined effects of cartographic generalization and sampling interval, and slope frequency concentrated in the gradient of the narrower ranges. Furthermore, cartographic generalization has greater impact on DEM slope of 1：25 million map, and sampling interval has a greater effect on the DEM slopes of all scale maps generated by 1：10000 map. |
| |
| Keywords: | DEM slope slope decrease slope frequency slope cumulative frequency |
| 本文献已被 CNKI 维普 等数据库收录！ |
|
