四川农业大学学报 ›› 2013, Vol. 31 ›› Issue (04): 456-460.doi: 10.3969/j.issn.1000-2650.2013.04.018

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基于ARCGIS计算SRTM数据DEM坡度的最优方法探讨

黄明1, 苏巧梅1, 黄诗哲2   

  1. 1. 太原理工大学矿业工程学院, 太原 030024;
    2. 中国矿业大学力学与建筑工程学院, 江苏 徐州 221116
  • 收稿日期:2013-05-02 出版日期:2013-12-31 发布日期:2017-02-28
  • 作者简介:黄明,在读硕士研究生。
  • 基金资助:
    山西省软科学基金(2012041029-04)

Optimum Calculation Method of SRTM DEM Data Based on ARCGIS Technology

Huang Ming1, SU Qiao-mei1, HUANG Shi-zhe2   

  1. 1. Taiyuan University of Technology, Mining engineering institute, Taiyuan 030024, China;
    2. China University of Mining and Technology, Mechanics and Engineering Institute, Xuzhou 221116, Jiangsu, China
  • Received:2013-05-02 Online:2013-12-31 Published:2017-02-28
  • Contact: 苏巧梅,副教授,硕士,研究方向为区域地理,E-mail:89183786@qq.com。 E-mail:89183786@qq.com

摘要: [目的] 在对SRTM DEM数据的处理过程中,不同的地貌类型,适用的坡度算法是不一样的。本文拟根据不同的地貌类型采用不同的计算法,通过比较分析,筛选出适合于研究区的坡度计算模型。[方法] 对于丘陵、山地、高山等地貌类型,一般采用三阶反距离平方权差分算法精度最高,而对于平原、台地等地貌类型,则采用三阶不带权差分算法精度最高。本文采用太原市的SRTM DEM影像,采用3种算法计算其坡度并进行精度对比。[结果] 通过判断3种坡度栅格模型的坡度起伏度值是否在阈值范围内,按照精度评判标准进行评价,表明通过混合算法坡度精度最高,三阶不带权算法精度次之,三阶反距离平方权算法精度最低。[结论] 根据区域不同的地貌类型,选择不同的坡度计算方法,再将计算所得的各类型坡度栅格图进行镶嵌处理,才能做出最精确的坡度栅格图。本文根据研究区地形地貌特点,所筛选的混合算法是最适合于研究区地貌类型的计算方法。

关键词: DEM, 坡度, 焦点统计, 权重求和, SRTM DEM影像数据

Abstract: [Objective] For SRTM DEM data,the calculation method of slope is different for different geomorphological type.The aim of the study was to compare and select the correct algorithm of slope according to the geomorphic conditions.[Method] The precision of three-order inverse distance square weight difference algorithm was the highest for hill and mountain.However,the precision third order without weight difference algorithm was the best for plain and tableland.In this study,the SRTM DEM images of Taiyuan city was used to compare the precision among the three methods.[Results] The three methods were evaluated via judging whether the value of slope fluctuation degree obtained by different models were within the scope of threshold The precision obtained by hybrid algorithm of gradient was the highest,followed by third order without weight difference algorithm and three-order inverse distance square weight difference algorithm.[Conclusion] The different slope calculation method was used according to different geomorphic types.The most accurate slope grid graph could be obtained by carrying out the mosaic processing.Based on this principle,the hybrid algorithm is the most applicable method for the Taiyuan city in Shanxi province.

Key words: DEM, slope, focus of statistics, weighted sum, SRTM DEM data

中图分类号: 

  • P237