TITLE:
Assessment of Remotely Sensed Digital Elevation Models (DEMs) Compared with DGPS Elevation Data and Its Influence on Topographic Attributes
AUTHORS:
Moawad Badawy Moawad, Ahmed Omar Abd El Aziz
KEYWORDS:
SRTM, ASTER GDEM, RTK System, Error Assessment, Topographic Attributes
JOURNAL NAME:
Advances in Remote Sensing,
Vol.7 No.2,
June
29,
2018
ABSTRACT: Accuracy
and quality of DEM are of a great interest for a wide range of applications. In
this study, quality of ASTER GDEM and SRTM DEMs were assessed in comparison
with DGPS measurements. Impact of DEM resolution upon the accuracy of terrain
representation and topographic attributes was also discussed. The study deduced
that vertical error has a strong effect on error propagation and this highly
obvious in higher elevations as the absolute standard error (SE) ranges between
is ±0 - 2.5 and ±0 - 2.4 m for ASTER GDEM and SRTM respectively. This is
reflected on slope and aspect as the vertical errors increase and uncertainty
is relatively high in flat and low areas. Error propagation in low lands
influenced drainage extraction and resulted in isolated and truncated water
courses.