Shuttle Radar Topographic Mission (SRTM) has created datasets of global
elevations that is freely available for modeling and environmental applications. The
global availability (almost 80% of the Earth surface) of SRTM data provides
baseline information for geospatial applications such as mapping, hydrology,
navigation, GIS applications, and reconnaissance. Assessment of the accuracy of
SRTM requires regional studies involving points with known elevations at higher
level of precision than the SRTM, usually measured with Global Positioning
System (GPS).
This study based on datasets collected with a differential GPS system in different
locations in Iraq. These measurements were corrected with differential methods to
reach to sub – centimeter accuracy. Statistical analysis included estimation of
absolute errors by Root Mean Square Error (RMSE), Standard Deviation (SD).
RMSE was found as (5.15m) for Iraq and the SD was (3.93). This is higher than
the standard SRTM-DEM accuracy which is (16m)