Determining DEMs' Resolution with Digital Photogrammetric Data

WANG Lei; YANG Qin-ke; LONG Yong-qin; WANG Chun-mei; GUO Wei-ling

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Determining DEMs' Resolution with Digital Photogrammetric Data

- Determining DEMs' Resolution with Digital Photogrammetric Data
- Bulletin of Soiland Water Conservation Vol. 32, Issue 5, Pages: 152-155(2013)
- 作者机构：
  
  1. 中国科学院水利部水土保持研究所陕西杨凌,712100
  2. 西北大学城市与环境学院,陕西,西安,710127
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2013
- 稿件说明：
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WANG Lei, YANG Qin-ke, LONG Yong-qin, et al. Determining DEMs' Resolution with Digital Photogrammetric Data[J]. Bulletin of Soiland Water Conservation, 2013, 32(5): 152-155.
DOI：

WANG Lei, YANG Qin-ke, LONG Yong-qin, et al. Determining DEMs' Resolution with Digital Photogrammetric Data[J]. Bulletin of Soiland Water Conservation, 2013, 32(5): 152-155. DOI：

摘要

分辨率是栅格DEM的基本参数之一，其大小直接影响到DEM的数据质量和地形分析的精度。采用多大的分辨率是建立和应用DEM时需解决的基本问题。利用全数字航空摄影测量方法，获取了位于陕北丘陵沟壑区的实验样区的高精度地形特征点、线数据，在此基础上，生成了9种不同数据密度的点数据集。然后利用ANUDEM和TIN方法，建立具有不同格网尺寸的2种DEM数据系列，并提取坡度均方差，平均坡度和高程中误差。根据坡度均方差、平均坡度和高程中误差随格网尺寸变化的规律，确定了建立DEM时合适的分辨率大小。研究结果表明，在利用全数字摄影测量方法建立1:10000比例尺的DEM时，应采用的分辨率约为2.5m。

Abstract

As one of basic parameters of gridded DEMs

resolution influences the quality of DEMs and t1 precision of terrain analysis.Choice of a suitable resolution is the basic problem to solve in generating at using DEMs.Based on the terrain features data with high precision of study area in northern Shaanxi Proince

which are extracted by the full digital photogrammetrv

9 source data with different data densities create DEMs are obtained.Two types of DEMs

i.e.

ANUDEM and TIN-DEM with different grid size are generated using the source data

and RMS slope

average slope and RMSE of elevation are extracted from the DEMs.According to the relationship between the grid size and RMS slope

average slope and RMSE elevation

a suitable resolution is achieved.Results show that the suitable resolution for building DEM 1 the full digital photogrammetrv is about 2.5 m in scale 1:10000.

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