Analysis of the Expression Accuracy about Topographical Factors in Multi-sources DEM Data

doi:10.13474/j.cnki.11-2246.2018.0276

Abstract

Abstract: In this paper,under the different grouping conditions,DEMs constructed by ZY-3 stereo images,containing SRTM and ASTER GDEM,compare their slope and slope length to the reference DEM which is constructed by 1:10 000 digital topographic maps. The results show that the 10 mresolution DEM constructed by ZY-3 data shows the highest quality. Increasing the number of control points and the resolution of DEM production don't improve the quality of the data. The 30 m resolution SRTM and the ASTER GDEM_v2 show the absolute advantages at altitudes of 1000~1100 m,but the 10 m resolution DEM constructed by ZY-3 data does well at altitudes of 1100~1300 m and in different land use groups. Established the similarity evaluation index——SI which is based on multiple sets of sample data. SI could evaluate the similarity quantitatively between the reference sample data and the experimental sample data by synthesize the Mean and SD. SI is an important indicator that quantitatively reflects the similarity between data sets.

Key words: ZY-3, SRTM, ASTER GDEM, topographical factor, accuracy evaluation

CLC Number:

P237

WANG Ning, LIU Wanqing, YAO Zhihong, LIU Chunchun. Analysis of the Expression Accuracy about Topographical Factors in Multi-sources DEM Data[J]. 测绘通报, 2018, 0(9): 39-44.

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