Universiti Teknologi Malaysia Institutional Repository

Comparative analysis of ASTER DEM, ASTER GDEM, and SRTM DEM based on ground-truth GPS data

Rokni, Komeil and Ahmad, Anuar and Hazini, Sharifeh (2015) Comparative analysis of ASTER DEM, ASTER GDEM, and SRTM DEM based on ground-truth GPS data. Jurnal Teknologi, 76 (1). pp. 97-102. ISSN 1279-696

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Official URL: http://www.jurnalteknologi.utm.my/index.php/jurnal...

Abstract

This study aims to compare the accuracies of ASTER DEM, ASTER GDEM, and SRTM DEM for the area of Universiti Teknologi Malaysia (UTM) and surrounding. In doing so, a number of Ground Control Points (GCPs) were collected using GPS technology and used to generate an absolute DEM using the ASTER stereo imagery. Moreover, two well-known DEMs including ASTER GDEM and SRTM DEM were obtained for the same area with ASTER image. Subsequently, several high accuracy ground-truth points were established around UTM using dual frequency GPS and used to assess the accuracies of the obtained DEMs. The results indicate that an elevation Root Mean Square Error (RMSE) of ±14.86m is achieved for the generated ASTER DEM, which is less than the 15m pixel size of ASTER image. The results further show that the elevation RMSEs of the ASTER GDEM and SRTM DEM are respectively ±4.52m and ±4.14m for the study area. The results illustrate although the resolution of SRTM DEM is much lower than ASTER GDEM, it could provide higher elevation accuracy. Finally, although the accuracy of the ASTER DEM in this study is not high in comparison with the accuracies of ASTER GDEM and SRTM DEM, based on the selected number of check points and resolution of ASTER image, it could be useful for various geoinformation applications.

Item Type:Article
Subjects:A General Works
ID Code:58091
Deposited By: Haliza Zainal
Deposited On:04 Dec 2016 12:07
Last Modified:01 Nov 2017 12:17

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