测绘通报 ›› 2018, Vol. 0 ›› Issue (5): 41-47.doi: 10.13474/j.cnki.11-2246.2018.0141

• 学术研究 • 上一篇    下一篇

Python辅助下的坡度提取不确定性分析

吴馁1,2, 李朝奎1,2, 方军1,2, 褚楠1,2, 吴柏燕1,2   

  1. 1. 湖南科技大学地理空间信息技术国家地方联合工程实验室, 湖南 湘潭 411201;
    2. 湖南科技大学地理空间信息湖南省工程实验室, 湖南 湘潭 411201
  • 收稿日期:2017-11-30 出版日期:2018-05-25 发布日期:2018-05-31
  • 通讯作者: 李朝奎。E-mail:chkl_hn@163.com E-mail:chkl_hn@163.com
  • 作者简介:吴馁(1993-),男,硕士生,主要从事GIS理论方法与应用研究。E-mail:wunei2016@163.com
  • 基金资助:

    国家自然科学基金(41271390);湖南省教育厅重点项目(16A070);湖南省自然科学基金湘潭联合基金(2017JJ4037);特殊环境道路工程湖南省重点实验室开放基金(kfj150502)

Uncertainty Analysis for Slope Extraction Based on Python

WU Nei1,2, LI Chaokui1,2, FANG Jun1,2, CHU Nan1,2, WU Baiyan1,2   

  1. 1. National-Local Joint Engineering Laboratory of Geo-Spatial Information Technology, Hunan University of Science and Technology, Xiangtan 411201, China;
    2. Hunan Province Engineering Laboratory of Geospatial Information, Hunan University of Science and Technology, Xiangtan 411201, China
  • Received:2017-11-30 Online:2018-05-25 Published:2018-05-31

摘要:

以30 m空间分辨率的DEM为试验数据源,借助Python地理建模技术深入研究坡度提取的不确定性。以平均坡度来代表坡度的一般水平,将研究区划分为7种地貌类型,将30 m分辨率的DEM数据重采样成30~120 m分辨率的10组DEM数据,使用以ArcGIS平台和Python开发语言为基础的地理建模技术,定量分析平均坡度与DEM空间分辨率、区域地貌特征的关系,研究坡度提取的不确定性。结果表明:研究区内不同地貌区域提取的平均坡度都随DEM分辨率的减小而减小,衰减速率基本不变;其回归方程的常数项与所在地貌单元的沟壑密度呈二次函数变化特征;坡度提取的精度与DEM的分辨率呈正相关的关系;基于Python的地理建模技术有效地整合了坡度提取分析方法,极大地提高了分析效率;研究结果进一步验证了现有坡度提取方法的不确定性。

关键词: DEM, 坡度提取, 不确定性, Python

Abstract:

Taking DEM with spatial resolution of 30 meters as experimental data source,the uncertainty of slope extraction is deeply studied by using Python geographic modeling technology.The general level of slope is to be represented by the average slope,and the study area is divided into 7 landscape types,the 30 m resolution of DEM data is resampled into 10 groups DEM data of 30~120 m resolution.Using ArcGIS platform and Python development language based geographic modeling technology,quantitative analysize DEM spatial resolution,mean slope and area geomorphic features,the uncertainty of slope extraction is studied.The research results show that the average slope region in different geomorphic regions are extracted with decreasing resolution of DEM decreases,the decay rate is basically unchanged.The regression equation of the constant term and the geomorphic unit is characteristic of the two gully density curve.

Key words: DEM, slope extraction, uncertainty, Python

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