TITLE:
Vertical Accuracy Assessment of SRTM Ver 4.1 and ASTER GDEM Ver 2 Using GPS Measurements in Central West of Tunisia
AUTHORS:
Ali Chaieb, Noamen Rebai, Samir Bouaziz
KEYWORDS:
Vertical Accuracy, Tunisia, DTM, GPS, SRTM, ASTER
JOURNAL NAME:
Journal of Geographic Information System,
Vol.8 No.1,
February
19,
2016
ABSTRACT: This paper focuses on the
quality of the vertical accuracy of two Digital Elevation Models, corresponding
to Kasserine region, central west Tunisia. The vertical accuracy assessment is
based on 23 GPS ground control points belonging to the study area. We applied a
statistic analysis approach and established 3 elevation profiles corresponding
to GPS, ASTER and SRTM. The erected statistical analysis reveals that the Root
Mean Squared Error (RMSE) was 8.88 and 10.13 respectively for SRTM and ASTER
DTMs. 2D elevation profiles constructed for GPS measurements, ASTER and SRTM,
highlight that both DTMs underestimate the true elevation and that SRTM DTM is
quite closer to the GPS elevation profile. Relying on this investigation, we
think that both DTMs are significant for the vertical accuracy assessment and
we urge that SRTM DTM might scheme the Kasserine area features better than
ASTER DTM.