# [postgis-users] ST_MaxDistance

George Silva georger.silva at gmail.com
Fri Sep 28 21:31:44 PDT 2012

```OMG, I'm sorry,

I've confused the whole thing. I'm awake for a long long time. Way too long.

Mathieu, sorry for the trouble.

On Sat, Sep 29, 2012 at 1:28 AM, <basille at ase-research.org> wrote:

> 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 <http://blog.geoprocessamento.net>
>>
>>
>>
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>>
>
> --
>
> ~\$ whoami
> Mathieu Basille, Post-Doc
>
> ~\$ locate
> Laboratoire d'Écologie Comportementale et de Conservation de la Faune
> + Centre d'Étude de la Forêt
> Département de Biologie
> Université Laval, Québec
>
> ~\$ info
> http://ase-research.org/**basille <http://ase-research.org/basille>
>
> ~\$ fortune
> ``If you can't win by reason, go for volume.''
> Calvin, by Bill Watterson.
>

--
George R. C. Silva

Desenvolvimento em GIS
http://geoprocessamento.net
http://blog.geoprocessamento.net
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