Figure 6. Q-Q plot of Kasserine region showing error distribution for (a) SRTM and (b) ASTER. Solid red line represents theoretical normal distribution.

Figure 7. GPS, ASTER and SRTM elevation profiles.

The SRTM good accuracy compared to ASTER in the study area may probably be explained by the absence of a vegetation cover.

Acknowledgements

Author is thankful to Adel Zafouri for improving the English language of the paper and also is thankful to Tunisian Office of Topography and Cadastre for providing GPS measurement.

Cite this paper

AliChaieb,NoamenRebai,SamirBouaziz, (2016) Vertical Accuracy Assessment of SRTM Ver 4.1 and ASTER GDEM Ver 2 Using GPS Measurements in Central West of Tunisia. Journal of Geographic Information System,08,57-64. doi: 10.4236/jgis.2016.81006

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NOTES

*Corresponding author.

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