DEM Resolution Impact on the Estimation of the Physical Characteristics of Watersheds by Using SWAT

Table 1

Detail of DEM sourses.

Items	LDD DEM	ASTER DEM	SRTM3 DEM
Distribution	LDD	ASTER	NASA/USGS
Release year	2004	2009	2003
Posting interval	5 m	30 m	90 m
DEM accuracy (standard deviation)	2–4 m	7–14 m	10 m
DEM coverage	Thailand	83°N–83°S	60°N–56°S