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Re: Georeferenced sensor and coverage data

From: Frans Knibbe <frans.knibbe@geodan.nl>
Date: Mon, 1 Jun 2015 16:23:50 +0200
Message-ID: <CAFVDz42VdY2hMd3iT99d8oGdVtM7zDqChNkdQ+GuWZFGE55F=Q@mail.gmail.com>
To: Peter Baumann <p.baumann@jacobs-university.de>
Cc: Alejandro Llaves <allaves@fi.upm.es>, SDW WG Public List <public-sdw-wg@w3.org>
2015-05-29 13:25 GMT+02:00 Peter Baumann <p.baumann@jacobs-university.de>:

>  Hi Frans,
>
> On 05/29/15 13:21, Frans Knibbe wrote:
>
> Hello Alejandro, Peter,
>
>  I am not clear on this yet. If we can relate a thing like a coverage or
> a sensor observation to a geometry (e.g. a point, a bounding box or a
> polygon), isn't the thing georeferenced? In my mind, the linkability
> requirement covers georeferencing in general.
>
>
> not necessarily. Example: a satellite image has an extent of several km2.
> Linking to it just links to its footprint, but not to a specific coordinate
> point.
>

But it is possible to link to the image in many different ways, isn't it?
The image could be linked to a bounding box, an extent, a centre point, one
of its corner points ... Why would linking to it l only apply to its
footprint? Or is that a feature of ISO-19123?

But if we take ISO 19123 as the starting point for this requirement, isn't
the current phrasing funny because it is already possible to georeference
coverage data?

Regards,
Frans

A sensor observation, OTOH, which is a single point measurement could be
> used as a proxy (!) for a specific coordinate.
>
> my 2 cents,
> Peter
>
>
>
>
>  Regards,
> Frans
>
>
>
> 2015-05-29 12:32 GMT+02:00 Alejandro Llaves <allaves@fi.upm.es>:
>
>> +1 to Peter
>>
>>  We could merge the reqs. for georeferencing sensor and coverage data,
>> but I would not say they are covered by the linkability req.
>>
>>  Cheers,
>> Alejandro
>>
>>
>> On 28 May 2015 at 19:46, Peter Baumann <p.baumann@jacobs-university.de>
>> wrote:
>>
>>>  Hi Frans,
>>>
>>> not sure, but I understand that "spatial data" has its georeference
>>> built in (through particular technical means, eg, in the coverage model)
>>> whereas the linkability text just demands that any data can be connected to
>>> such georeferenced data:
>>>
>>> *"Spatial data on the Web should be linkable (by explicit relationships
>>> between different facts in different data sets), to other spatial data and
>>> to or from other types of data."*
>>>
>>> best,
>>> Peter
>>>
>>>
>>>
>>> On 05/28/15 18:54, Frans Knibbe wrote:
>>>
>>> Hello Alejandro,
>>>
>>>  I wonder if there should be separate requirements for Georeferenced
>>> coverage data
>>> <http://w3c.github.io/sdw/UseCases/SDWUseCasesAndRequirements.html#GeoreferencedCoverageData>
>>> and  Georeferenced sensor data
>>> <http://w3c.github.io/sdw/UseCases/SDWUseCasesAndRequirements.html#GeoreferencedSensorData>.
>>> Aren't those requirements covered by the Linkability requirement
>>> <http://w3c.github.io/sdw/UseCases/SDWUseCasesAndRequirements.html#Linkability>?
>>> If this requirement is met, anything can be georeferenced.
>>>
>>>  Regards,
>>> Frans
>>>
>>>  --
>>>  Frans Knibbe
>>>  Geodan
>>> President Kennedylaan 1
>>> 1079 MB Amsterdam (NL)
>>>
>>>  T +31 (0)20 - 5711 347 <%2B31%20%280%2920%20-%205711%20347>
>>> E frans.knibbe@geodan.nl
>>> www.geodan.nl
>>> disclaimer <http://www.geodan.nl/disclaimer>
>>>
>>>
>>>   --
>>> Dr. Peter Baumann
>>>  - Professor of Computer Science, Jacobs University Bremen
>>>    www.faculty.jacobs-university.de/pbaumann
>>>    mail: p.baumann@jacobs-university.de
>>>    tel: +49-421-200-3178, fax: +49-421-200-493178
>>>  - Executive Director, rasdaman GmbH Bremen (HRB 26793)
>>>    www.rasdaman.com, mail: baumann@rasdaman.com
>>>    tel: 0800-rasdaman, fax: 0800-rasdafax, mobile: +49-173-5837882
>>> "Si forte in alienas manus oberraverit hec peregrina epistola incertis ventis dimissa, sed Deo commendata, precamur ut ei reddatur cui soli destinata, nec preripiat quisquam non sibi parata." (mail disclaimer, AD 1083)
>>>
>>>
>>>
>>>
>>
>>
>>   --
>>    Alejandro Llaves
>>
>> Ontology Engineering Group (OEG)
>>
>> Artificial Intelligence Department
>>
>> Universidad Politécnica de Madrid
>>
>> Avda. Montepríncipe s/n
>>
>> Boadilla del Monte, 28660 Madrid, Spain
>>
>>
>>  http://www.oeg-upm.net/index.php/phd/325-allaves
>>
>>
>>  allaves@fi.upm.es
>>
>
>
>
>  --
>  Frans Knibbe
>  Geodan
> President Kennedylaan 1
> 1079 MB Amsterdam (NL)
>
>  T +31 (0)20 - 5711 347
> E frans.knibbe@geodan.nl
> www.geodan.nl
> disclaimer <http://www.geodan.nl/disclaimer>
>
>
> --
> Dr. Peter Baumann
>  - Professor of Computer Science, Jacobs University Bremen
>    www.faculty.jacobs-university.de/pbaumann
>    mail: p.baumann@jacobs-university.de
>    tel: +49-421-200-3178, fax: +49-421-200-493178
>  - Executive Director, rasdaman GmbH Bremen (HRB 26793)
>    www.rasdaman.com, mail: baumann@rasdaman.com
>    tel: 0800-rasdaman, fax: 0800-rasdafax, mobile: +49-173-5837882
> "Si forte in alienas manus oberraverit hec peregrina epistola incertis ventis dimissa, sed Deo commendata, precamur ut ei reddatur cui soli destinata, nec preripiat quisquam non sibi parata." (mail disclaimer, AD 1083)
>
>
>
>


-- 
Frans Knibbe
Geodan
President Kennedylaan 1
1079 MB Amsterdam (NL)

T +31 (0)20 - 5711 347
E frans.knibbe@geodan.nl
www.geodan.nl
disclaimer <http://www.geodan.nl/disclaimer>
Received on Monday, 1 June 2015 14:24:18 UTC

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