[gdal-dev] geographic vs projected coordinate system

[adi_khan]

Hi all, 
I am a novice to geospatialrelated terminology...and going through some
literature to understand better.. 
Could someone please tell difference btwn geographic and projected
coordinate system... 
I mean, I am not able to imagine how I can  see an (satellite) image on
screen ( flat surface) and say it is in geographic cordinate system (GCS)... 
as GCS means lat/long and I see it on a flat screen, so should it not be 
projected if I am seeing it on a flat screen? And if it is projected, then
how can it be in GCS ? 

My doubt, perhaps , may sound very trivial for all the experts out there but
I will really appreciate anything that will aid my understanding. 

Thanks. 



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