[Proj] cs2cs's +towgs84 usage

[Jan Hartmann]

On 04/23/10 21:02, Clifford J Mugnier wrote:
> Interesting to note that the "European" convention is left-handed in 
> geodetic 7-parameter transformations just as it is left-handed in 
> their photogrammetric transformations and also was with their old 
> European opto-mechanical stereoplotters.
> The "American' convention is right-handed in geodetic 7-parameter 
> transformations just as it is right-handed in their photogrammetric 
> transformations and also was with their old American opto-mechanical 
> stereoplotters.
> Both sides of the Atlantic have been pretty consistent for over a 
> century ... that's not arbitrary to me.
>
It's all because of the longer history we have here in Europe. See:

http://www.amphicars.com/acleft.htm
http://www.straightdope.com/columns/read/634/why-do-the-british-drive-on-the-left

and a few others if you search Google :-)

Jan
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