[postgis-users] ST_MaxDistance

[basille at ase-research.org]

Not weird for me: the max distance is between (1,1) and (-1,-1), which is 
sqrt(2^2 + 2^2) = 2.828427
At least, that's what Pythagoras told me once :)

Mathieu.


Le 28/09/2012 23:58, George Silva a écrit :
> Hey guys, weird results here...
>
> Check this:
>
> SELECT ST_MaxDistance(
> ST_MakeLine(ST_MakePoint(0,0),ST_MakePoint(1,1)),
> ST_MakeLine(ST_MakePoint(0,0),ST_MakePoint(-1,-1)));
> -- 2.82842712474619 (this corresponds to 2x sqrt(2)?)
>
> For me the max distance between these polylines is 2.
>
> Or am I expecting something diferent for this function?
>
> Thanks
>
> --
> George R. C. Silva
>
> Desenvolvimento em GIS
> http://geoprocessamento.net
> http://blog.geoprocessamento.net
>
>
>
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-- 

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Mathieu Basille, Post-Doc

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Laboratoire d'Écologie Comportementale et de Conservation de la Faune
+ Centre d'Étude de la Forêt
Département de Biologie
Université Laval, Québec

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