The study conducted aimed to examine the accuracy of Digital Elevation Models (DEMs) in Egypt, specifically the
TanDEM-X mission’s 30 m and 12 m resolution DEMs and the SRTM DEM with a 30 m resolution. The accuracy of
DEMs is essential for various civil engineering and surveying applications, especially in geoscience applications.
To ensure the comparison’s accuracy, the study used ellipsoidal heights instead of orthometric heights, preventing
errors
caused
by
global
geopotential
models
in
the
conversion
process.
The
evaluation
of
the
three
DEMs
was
carried
out
using
352
GNSS
points.
The
findings
indicate
that
both
TanDEM-X
DEMs
with
30
m
and
12
m
resolutions
outperform
the
SRTM
30
m
in
terms
of
vertical
accuracy,
making
them
ideal
for
geomatic
applications
that
require
higher-resolution
DEMs.
The
TanDEM-X
30
m
generates
a
standard
deviation
(STD)
and
a
Root
Mean
Square
Error
(RMSE)
of
approximately
3.03
m
and
3.45
m,
respectively.
On
the
other
hand,
the
TanDEM-X
12
m
generates
an
STD
and
RMSE
of
approximately
2.86
m
and
3.18
m,
respectively.
Comparatively,
the
SRTM
30
m
produces
an
STD
and
RMSE
of
approximately
4.67
m
and
5.35
m,
respectively.
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