On the quality of DCW hypsographic data: A study for Taiwan

Tian-Yuan Shih*, Young Chyi Chiu, Hong Yang Shih

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The objective of this study is to investigate the quality of DCW hypsographic data. During the investigation, grid DEMs were generated for Taiwan. The results were graphically evaluated, and five numerical indices are also presented. These indices provide information about the maximum error, the 90 percent ranking error, the root mean squares error, the mean absolute error, and the mean error. The spot heights from DCW were used as check points. For the 30″ × 30″ grid DEM generated with the constrained TIN-linear model, the root mean square error was 176.836 m and the 90 percent ranking error was 213.149 m, with the bias removed.

Original languageEnglish
Pages (from-to)27-35
Number of pages9
JournalSurveying and Land Information Science
Issue number1
StatePublished - 1 Mar 2003


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