[Proj] Difference between same projections types

Mustafa646 noorcs22 at gmail.com
Tue Feb 14 12:50:22 EST 2012

Below are the strings of same projection WGS1984

1.  (+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs )


3. EPSG: 4326

I know that above 3 represent same projection type. But Can anybody explain
me why we use these different strings for the same projection? And when to
use what? And what is the difference between these 3 types.

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