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RE: How can I declare that the coordinates I publish are only approximations?

From: John Goodwin <John.Goodwin@ordnancesurvey.co.uk>
Date: Mon, 30 Sep 2013 12:08:19 +0000
To: "public-geosemweb@w3.org" <public-geosemweb@w3.org>
Message-ID: <30BB6C643AA06A429A22F4F40CCD13D40DE4A1A6@WP112.ordsvy.gov.uk>
Hi,

That’s a fair point. I did ask a colleague who is more of a GML expert than me if there was a way to express significant figures in GML. She wasn’t aware of a way.

Regards,

John

Dr John Goodwin
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From: Frans Knibbe | Geodan [mailto:frans.knibbe@geodan.nl]
Sent: 27 September 2013 09:12
To: public-geosemweb@w3.org
Subject: Re: How can I declare that the coordinates I publish are only approximations?

Hello Lars,

Aren't all coordinates in geographical data sets approximations?

I think the right thing to do is to use the appropriate amount of significant digits<http://en.wikipedia.org/wiki/Significant_figures> for the coordinates. Is it possible for you to quantify the amount of approximation?

Regards,
Frans

On 12-9-2013 13:16, Svensson, Lars wrote:

All,



A few months ago I asked for advice on how to represent coordinates for maps and got very valuable insights. Now I have a related question: When libraries and archives digitise historic maps they also create metadata for them, including a best-effort attempt to determine the map's geographic coverage. It goes without saying that the determined coordinates are mere approximations. When we publish that data in RDF, is there a way to express in geosparql (or WKT) that the specified coordinates are only approximations? I looked in the geosparql vocabulary and WKT but could not find any information.



Thanks in advance,



Lars

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Received on Monday, 30 September 2013 12:08:43 UTC

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