RE: Spatial context

Ø  … 'Feature': “..equivalent to GFI_Feature defined in ISO 19156:2011”. Unfortunately GFI_Feature as defined in ISO 19156:2011 is not a web resource and ISO 19156:2011 is not an open standard (because you have to pay for it). But it's a start...

ISO 19156:2011 is jointly published by OGC as Topic 20 of their Abstract Spec, and available freely here: http://www.opengeospatial.org/standards/om or directly from www.opengis.net/doc/om<http://www.opengis.net/doc/om>

(Side question: does payment=”not open”? On that basis almost the entire academic literature is “closed”, since you can only read it if you have a subscription! Ditto most books. I agree that the ISO business model is tedious, and does not meet modern expectations for web standards, but an argument can easily be made that ISO standards are indeed “open” as there is no limitation on access to the document other than buying it, and then there is no limitation on use. )



From: Frans (Geodan) [mailto:frans.knibbe@geodan.nl]
Sent: Friday, 20 February 2015 12:14 AM
To: public-sdw-wg@w3.org
Subject: Re: Spatial context


I think that the question whether data are spatial data largely depends on the data publisher. The designation “Greater London” could be published as a text label, in which case it is not spatial data. It could also be published as a toponym, in which it is spatial data.

This discussion seems to point at an important requirement for our work, which may or may not be derived from use cases, but still is important: We need clear and universal semantics.

What makes a thing spatial? Does it have to have geometry? Does it have to have three dimensions? Does it need to be a terrestial object? Does it need to be non-fictional? All these things are debatable, but rather than debate them it would be good to have agreed upon semantics.

At the moment, there are some definitions out there on the semantic web. For example, the Location Core Vocabulary<http://www.w3.org/ns/locn> defines the concept 'location'. Unfortunately the definition is self-referencing: “any location, irrespective of size or other restriction”. In other words, it is very open to interpretation. Is “Paris” a location (knowing that there are multiple locations with that name)? Is Atlantis (fictional) a location? Is Olympus Mons (on Mars) a location?

GeoSPARQL<%28http:/www.opengis.net/ont/geosparql> has definitions for the concept 'SpatialObject': “..everything that can have a spatial representation” (unfortunately the 'spatial representation' part is undefined) and 'Feature': “..equivalent to GFI_Feature defined in ISO 19156:2011”. Unfortunately GFI_Feature as defined in ISO 19156:2011 is not a web resource and ISO 19156:2011 is not an open standard (because you have to pay for it). But it's a start...

Greetings,
Frans


On 2015-02-19 11:50, Ed Parsons wrote:
This is a great discussion and I think it is central to the potentially difficult overlap between the two community perspectives.

I'm sure Josh will chip in but I do think we need to recognise that we need to include spatial information for which it is not possible to define a geometry or have linked to as an attribute - This I think is what Josh means by context, I am writing this email from a location within "Central London" although there is not a canonical geometry that represents the shape of central London.

This is an example of what Mike Goodchild calls a Platial Problem !

This must be in scope, does the current wording around spatial information accommodate it ?

Ed


On Thu Feb 19 2015 at 10:26:55 Andrea Perego <andrea.perego@jrc.ec.europa.eu<mailto:andrea.perego@jrc.ec.europa.eu>> wrote:
Andreas's mail gives me the opportunity to explain the objection I
raised during the call [1] about the proposal of adding "spatial
context" into scope question #1 [2].

My main concern is that the use of "spatial context" in the scoping
question may be confusing, and probably unnecessary.

In my understanding, spatial context is specified through spatial data
- i.e., it denotes one of their possible uses. So, "spatial data"
should be inclusive enough - it would cover spatial data as a whole,
irrespective of their use.

Thanks!

Andrea

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[1]http://www.w3.org/2015/02/18-sdw-minutes.html

[2]http://www.w3.org/2015/spatial/wiki/Scope_questions_and_Requirements


On Wed, Feb 18, 2015 at 10:10 PM, Andreas Harth <harth@kit.edu<mailto:harth@kit.edu>> wrote:
> Hi,
>
> the issue I had with the term "spatial context" is that I did not know
> what the "context" part was supposed to mean.
>
> If I understood Josh correctly, he mentioned that a geometry,
> a place description or a spatial feature should be referenceable
> in data.
>
> If "spatial context" does mean that, I'm fine with the phrasing of
> the scoping question.
>
> Cheers,
> Andreas.
>



--
Andrea Perego, Ph.D.
Scientific / Technical Project Officer
European Commission DG JRC
Institute for Environment & Sustainability
Unit H06 - Digital Earth & Reference Data
Via E. Fermi, 2749 - TP 262
21027 Ispra VA, Italy

https://ec.europa.eu/jrc/


----
The views expressed are purely those of the writer and may
not in any circumstances be regarded as stating an official
position of the European Commission.


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