Research on Terrain Significance Index and Its Quantification Model based on Grid-DEMs

TitleResearch on Terrain Significance Index and Its Quantification Model based on Grid-DEMs
Publication TypeConference Paper
Year of Publication2013
AuthorsYoufu, Dong
Conference NameGeomorphometry 2013
Date Published2013
Conference LocationNanjing, China
AbstractRepresenting DEM cell’s significance in modeling the true terrain surface, Terrain Significance Index (TSI) which refers to the terrain information capacity for a grid point is presented and discussed in this paper by introducing quantitative model, extracting method and applications. On the basis of hierarchical cognitive models of the information theory, a comprehensive quantitative model of TSI is established by measuring local syntactic and global semantic terrain information contents. Choosing a 70km2 area in the loess gully region as test area and 5m-resolution DEM as test data, the paper discussed a series of TSI extraction scheme based on DEMs. In addition, a TSI based application in multi-scale terrain generalization is proposed. Experimental results show that the TSI measurement model proposed is feasible and TSI based multi-scale DEMs construction method is not only easy in implementing but also effective in reducing the terrain distortion. It proves that the multi-scale DEMs constructed by controlling TSI values could meet the demands in different levels of digital terrain modeling. Therefore, the research should be hopeful in deepening our understanding on DEM terrain information characteristics and in building a theoretical foundation and methodological support for multi-scale digital terrain modeling.
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