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Re: [Geojson] RFC 7946 - composing geometry objects with "mixed" positions

Erik Wilde <erik.wilde@dret.net> Wed, 26 April 2017 15:59 UTC

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To: Udo Schochtert <u.schochtert@gmail.com>, geojson@ietf.org
References: <CAENDquxrvzBNRa_doW2TprbE=OQfu9RJRs7RpT29zSLtye9_jg@mail.gmail.com>
From: Erik Wilde <erik.wilde@dret.net>
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Date: Wed, 26 Apr 2017 17:59:35 +0200
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Archived-At: <https://mailarchive.ietf.org/arch/msg/geojson/zbm8BBOWMQKK6_N1GP9SKF3nPUw>
Subject: Re: [Geojson] RFC 7946 - composing geometry objects with "mixed" positions
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hello udo.

On 2017-04-25 14:31, Udo Schochtert wrote:
> my question is if the following MultiPoint (composed by"mixed"
> positions) would be valid as well
>
> {
>   "type": "MultiPoint",
>   "coordinates": [
>     [100.0, 0.0],
>     [101.0, 1.0, 1.0]
>   ]
> }
>
> that would also apply to other geometries composed by"mixed" positions
> as well (e.g. LineString, Polygon, etc.). correct?

that's a good question. afaict, there is nothing in the spec language 
that keeps you from doing this. however, the semantics are unspecified. 
it is not clear if positions without elevations should have elevation 
zero or "inherit" the elevation of the last elevation-labeled position. 
my suggestion would be to not use this "mixed model", but that's just my 
personal opinion.

cheers,

dret.

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erik wilde | mailto:erik.wilde@dret.net |
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