DEM

SD Before Removing Outlier

SD After Removing Outliers

Improvement%

SRTM 1

±6.8

±6.5

4.4%

SRTM 3

±5.2

±5.1

1.9%

EarthEnv-DEM90

±5.0

±4.7

6.0%

GTOPO30

±21.9

±18.6

15.1%

GMTED2010

±4.9

±4.6

6.1%

ASTER

±9.9

±9.4

5.1%

GLOBE

±21.8

±12.6

42.2%

AW3D30

±6.8

±6.5

4.4%