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KEYWORDS: Sh 
ABSTRACT 
Continental-scale to; 
(SLA) experiment ai 
approximately 1 km. 
mean and standard 
America, and Austre 
vertical datum discre 
confirms that raster ¢ 
Digital Elevation M 
land topography at ; 
recently become ava 
distributed by Unite 
the Geological Surv 
Atmospheric and C 
great utility in regic 
topographic data ans 
available global top 
accuracy of these co 
because the elevatio 
numerous topograp 
quality. Significant 
disparate and poo: 
datums; thus, the DI 
representation of the 
Profiling laser altii 
provide the opportt 
vertical accuracy in 
(Harding et al., 19 
suited to measuring 
altimeters, because 
have no difficulty ra 
the optical backsc: 
surface height dis 
differentiate feature 
canopy layers and 
altimeter data lack : 
DEM's with spatia. 
utilising orbital st 
However, they do | 
the accuracy and