Edge Effect Analysis on Deriving Slope from Grid DEM

SONG Jia; Tang Anguo; Wang Chun; Xiao Chenchao

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Edge Effect Analysis on Deriving Slope from Grid DEM

- Edge Effect Analysis on Deriving Slope from Grid DEM
- Bulletin of Soiland Water Conservation Vol. 25, Issue 3, Pages: 82-85(2006)
- 作者机构：
  
  1. 南京师范大学地理信息科学江苏省重点实验室,江苏,南京,210097
  2. 西北大学城市与资源学系,陕西,西安,710069
- 作者简介：
- 基金信息：
- DOI：
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- Published：2006
- 稿件说明：
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SONG Jia, Tang Anguo, Wang Chun, et al. Edge Effect Analysis on Deriving Slope from Grid DEM[J]. Bulletin of Soiland Water Conservation, 2006, 25(3): 82-85.
DOI：

SONG Jia, Tang Anguo, Wang Chun, et al. Edge Effect Analysis on Deriving Slope from Grid DEM[J]. Bulletin of Soiland Water Conservation, 2006, 25(3): 82-85. DOI：

摘要

由DEM提取地形因子时一般采取3×3窗口分析运算

导致得到的地形因子矩阵在边缘上存在明显边缘误差。以黄土高原不同地貌类型区坡度的提取为例

研究基于1∶10 000和1∶50 000比例尺DEM提取坡度时所产生的边缘效应

分析了边缘效应与DEM分辨率、区域面积及区域地貌特征之间的关系

提出了解决或改善边缘效应的方法。用2个指标量化了边缘效应:一是平均坡度的变化值；二是边缘部分坡度提取的中误差。试验结果显示:平均坡度的变化值与DEM分辨率、区域面积及区域地貌特征之间有较明显的相关关系

即分辨率越高、区域面积越大

地面起伏越小

则边缘效应对整个区域平均坡度的影响就越小；而边缘部分坡度提取的中误差与区域面积没有明显的稳定相关关系

但与DEM分辨率和区域地貌特征之间存在较明显相关关系

即分辨率越高

地面起伏越大

则边缘上坡度提取的中误差越大。

Abstract

Neighborhood analysis calculation with 3×3 window is usually adopted to derive slope f rom Grid DEM.This method produces errors on the edge of terrain factors mat rix.This paper takes slope as an example

three areas with different terrain characteristics as test areas

studies the edge effect on deriving slope from DEM with different scale

analyses the relationship between the edge effect and DEM resolution

region area and terrain characters

puts forward some methods to solve or decrease impact of the edge effect .It is important for digitalterrain analysis with high precision. There are two indexes to express edge effect:the first is the change value of mean slope;the second is root mean square error on the edge when deriving slope. The result shows that

the change value of mean slope is related to DEM resolution

region area and terrain characteristics

RMSE on the edge when deriving slope is related to DEM resolution and terrain characteristics.

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Related Institution

Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling

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