地理科学进展 ›› 2005, Vol. 24 ›› Issue (6): 88-92.doi: 10.11820/dlkxjz.2005.06.010

• 地球信息科学 • 上一篇    下一篇

中国区域SRTM90m数字高程数据空值 区域的填补方法比较

游松财1, 孙朝阳1,2   

  1. 1. 中国科学院地理科学与资源研究所, 北京 100101|
    2. 中国科学院研究生院, 北京 100049
  • 收稿日期:2005-06-01 修回日期:2005-10-01 出版日期:2005-11-25 发布日期:2005-11-25
  • 作者简介:游松财(1963-),男,副研,博士,研究方向为数据融合与共享发布技术。E-mail:yousc@igsnrr.ac.cn
  • 基金资助:

    国家基础科技条件平台建设项目-地球系统科学数据共享网(2005DKA32300)。

Comparison of Patching Methods of SRTM 90m DEM Voids in China

YOU Songcai1, SUN Chaoyang1,2   

  1. 1. Institute of Geographical Sciences and Natural Resources Research, Beijing, 100101|
    2. Graduate School of the Chinese Academy of Sciences, Beijing 100049
  • Received:2005-06-01 Revised:2005-10-01 Online:2005-11-25 Published:2005-11-25

摘要:

本文对中国地区SRTM90m分辨率的数字高程数据的空值区域做了提取和分析,在此基础上尝试了4种内插填补的方法,并对各种处理方法的过程及结果做了比较,从而确定先从SRTM90m数据中直接提取等高线,再内插生成DEM,用内插出来的值填补原始数据的方法在目前较为适用。此外本文还提出了一些后期处理方法以完善数据。

关键词: SRTM, 等高线, 空值区域, 内插

Abstract:

SRTM90m digital elevation data contains no-data voids. Based on the analysis after retrieving the voids in the region of China, several processing methods are used to fill in them. Those methods are: (1) patching the void area with DEM data interpolated from contour line from paper map at scale of 1:1 000 000; (2) adding contour line from paper map at scale of 1: 1 000 000 to the void at SRTM90m data and then interpolating the patched data,; (3) patching the void by directly interpolating SRTM90m, and (4) retrieving and interpolating contour line from SRTM90m data. It is verified that the most operable method to fill in no data area is to interpolate the contour line which is retrieved directly from the original SRTM90m, but this method is effect to patch the small no data area; when no data area is big, it is better to use contour line from paper map with large scale, however, the quality of current paper map with large scale is not high enough, furthermore, the acquisition and publishing contour line from paper map with large scale (e.g. large than 1:1 000 000) is limited by related state security regulations. Further processing steps such as to add water body region are provided for better application of the data.

Key words: contour, interpolation, SRTM, voids