[postgis-users] st_distance meter/degree

[franco base]

Yes thanks a lot I understand.
I did't see it first to write the question to the list.
:(

2017-04-13 13:24 GMT+02:00 Olivier Leprêtre <o.lepretre at gmail.com>:

>
>
> *De :* postgis-users [mailto:postgis-users-bounces at lists.osgeo.org] *De
> la part de* franco base
> *Envoyé :* jeudi 13 avril 2017 13:08
> *À :* PostGIS Users Discussion
> *Objet :* Re: [postgis-users] st_distance meter/degree
>
>
>
> Sorry.
>
> I don't see the 10-5at the end
>
> very sorry
>
>
>
> 2017-04-13 13:05 GMT+02:00 Jorge Gustavo Rocha <jgr at di.uminho.pt>:
>
> Hi Franco,
>
> I did not understood your question.
>
> Postgis calculates the distance/area according to the CRS unit. It the
> CRS unit is degrees, the results is in degrees. If the CRS unit is
> meter, the result is in meter.
>
> For example, if you transform the geometry, like:
> SELECT ST_Distance(ST_Transform(geometry, 25829)) ...
> the result will be in meter.
>
> Regards,
>
> Jorge
>
> Às 11:54 de 13-04-2017, franco base escreveu:
> > Thanks Jorge but it isn't the matter.
> > I'd know why postgis have a different way to calculate the distance
> > with the same sql query.
> >
> > 2017-04-13 12:37 GMT+02:00 Jorge Gustavo Rocha <jgr at di.uminho.pt
> > <mailto:jgr at di.uminho.pt>>:
> >
> >     Hi Franco,
> >
> >     You can use the usual control statements IF THEN ELSE [1] to make it
> >     exactly like you want.
> >
> >     [1]
> >     https://www.postgresql.org/docs/current/static/plpgsql-
> control-structures.html
> >     <https://www.postgresql.org/docs/current/static/plpgsql-
> control-structures.html>
> >
> >     Regards,
> >
> >     Jorge
> >
> >     Às 10:57 de 13-04-2017, franco base escreveu:
> >     > Hi all.
> >     > Is it possible that st_distance between point return meter
> distance if
> >     > point are very close and degrees otherwise?
> >     >
> >     > SELECT ST_distance ( ST_SetSRID
> >     > (ST_MakePoint(45.4553804010375,9.11292550791171) ,4326),
> ST_SetSRID
> >     > (ST_MakePoint(45.4553855607023,9.11291318106981) ,4326))
> >     >
> >     > return 1.3 ( meter distance)
> >     >
> >     >
> >     > SELECT ST_distance ( ST_SetSRID
> >     > (ST_MakePoint(45.4553804010375,9.11292550791171) ,4326),
> ST_SetSRID
> >     > (ST_MakePoint(45.4560699405679,9.1164832309759) ,4326))
> >     >
> >     > return 0.003 (degrees distance)
> >     >
> >     >
> >     > Thanks
> >     > fb
> >     >
> >     >
> >     >
> >     >
> >     >
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> >     >
> >
> >     J. Gustavo
> >     --
> >     Jorge Gustavo Rocha
> >     Departamento de Informática
> >     Universidade do Minho
> >     4710-057 Braga
> >     Tel: +351 253604480 <tel:%2B351%20253604480 <%2B351%20253604480>>
> >     Fax: +351 253604471 <tel:%2B351%20253604471 <%2B351%20253604471>>
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> >
> >
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> >
>
> J. Gustavo
> --
> Jorge Gustavo Rocha
> Departamento de Informática
> Universidade do Minho
> 4710-057 Braga
> Tel: +351 253604480
> Fax: +351 253604471
> Móvel: +351 910333888
> skype: nabocudnosor
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