Producing of 1：250000 Map Scaled DEM in Different Terrain Roughness

ZHAO Bang yuan; TANG Guo an; MA An li; YU Quan gang; GUO Yu tao

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Producing of 1：250000 Map Scaled DEM in Different Terrain Roughness

- Producing of 1：250000 Map Scaled DEM in Different Terrain Roughness
- Bulletin of Soiland Water Conservation Vol. 21, Issue 2, Pages: 45-48(2002)
- 作者机构：
  
  1. 黄河水利委员会黄河上中游管理局,陕西,西安,710043
  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：2002
- 稿件说明：
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ZHAO Bang yuan, TANG Guo an, MA An li, et al. Producing of 1：250000 Map Scaled DEM in Different Terrain Roughness[J]. Bulletin of Soiland Water Conservation, 2002, 21(2): 45-48.
DOI：

ZHAO Bang yuan, TANG Guo an, MA An li, et al. Producing of 1：250000 Map Scaled DEM in Different Terrain Roughness[J]. Bulletin of Soiland Water Conservation, 2002, 21(2): 45-48. DOI：

摘要

以在3个不同地貌类型区的试验为例证，研究探讨建立栅格化DEM的技术要点和技术方法，并对所建立DEM的精度进行评价。研究结果表明，在平原区可以直接利用Terlk层及水系要素建立DEM；在山区，则首先需要进行构造地形结构线的预处理，而在黄土丘陵沟壑区，不仅需要构造地形结构线，而且需借用大比例尺的高程数据进行高程加密处理，以最大限度地减少地貌特征信息的损失，为区域水土流失的动态监测基础地理数据库的建立提供重要的技术方法。

Abstract

Grid based DEM is a critical basic geo spatial data base in the analysis of regional topography feature. 1:250000 map scaled DEM is regarded as an important basis for the middle scaled investigation of soil erosion characteristics. Taking three areas of different terrain roughness as test areas

the effective procedures and methodology for the producing of DEM are probed into. In addition

by means of comparative method

the DEM accuracy were investigated

which can be regarded as possessing critical importance for the setting up DEMs

as well as evaluate their practicability and applicability in the field of regional soil erosion research in these corresponding areas.

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