Re: [Geojson] Question regarding position definition in RFC 7946 vs. ISO 6709 / RFC 5870

Florian Wolff <Flori@nWolff.de> Mon, 04 May 2020 14:12 UTC

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To: Martin Daly <Martin.Daly@cadcorp.com>
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From: Florian Wolff <Flori@nWolff.de>
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Date: Mon, 04 May 2020 16:11:58 +0200
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Subject: Re: [Geojson] Question regarding position definition in RFC 7946 vs. ISO 6709 / RFC 5870
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Hi Martin,

thank you very much for guessing and answering my question. This was 
exactly what I was looking for - the "good old philosophical" 
discussions if a point should be expressed as x,y or y,x (which in turn 
translates into y=lat/x=long).

Florian.

Am 01.05.2020 um 10:28 schrieb Martin Daly:
> Hi Florian,
> 
> Assuming that your question is “why does GeoJSON coordinate order 
> contradict ISO 6709 coordinate order?”, then the answer is: because it does.
> 
> The decision was taken in full possession of the facts, not lightly, or 
> without regard to the consequences. There are **extensive** email 
> exchanges on lists.geojson.org, if you like that kind of thing. This 
> response, from Howard, is more or less definitive (albeit replying to 
> slightly different questions):
> 
> http://lists.geojson.org/pipermail/geojson-geojson.org/2013-April/000707.html
> 
> Martin
> 
> *From:*GeoJSON [mailto:geojson-bounces@ietf.org] *On Behalf Of *Florian 
> Wolff
> *Sent:* 30 April 2020 16:52
> *To:* geojson@ietf.org
> *Subject:* [Geojson] Question regarding position definition in RFC 7946 
> vs. ISO 6709 / RFC 5870
> 
> I stumbled across this definitions years after publication, however 
> please excuse the following question as GeoJSON specifies
> 
>     A position is an array of numbers.  There MUST be two or more||
> 
>     elements.  The first two elements are longitude and latitude, or||
> 
>     easting and northing, precisely in that order and using decimal||
> 
>     numbers.
> 
> while according to ISO 6709 Standard representation of geographic point 
> location by coordinate and RFC 5870 the order of coordinates is
> 
>  1. First horizontal coordinate (y), such as latitude (negative number
>     south of equator and positive north of equator)
>  2. Second horizontal coordinate (x), such as longitude (negative values
>     west of Prime Meridian and positive values east of Prime Meridian)
> 
> With best regards,
> 
> Florian.
>