W3C home > Mailing lists > Public > public-sdw-wg@w3.org > June 2015

Re: The "Resolution global grid" requirement [SEC=UNCLASSIFIED]

From: Bruce Bannerman <B.Bannerman@bom.gov.au>
Date: Mon, 1 Jun 2015 23:21:18 +0000
To: Peter Baumann <p.baumann@jacobs-university.de>, Alejandro Llaves <allaves@fi.upm.es>, Frans Knibbe <frans.knibbe@geodan.nl>
CC: SDW WG Public List <public-sdw-wg@w3.org>
Message-ID: <D19325AB.1F4AE%B.Bannerman@bom.gov.au>
I can't see the original requirement at the URL below.

It may possibly refer to the concept described at [1], ISO/TC 211 NWIP N 4037: TheMap Code Standard:

"The Mapcode system defines a set of grids on the surface of the earth, a unique code for each grid cell, and algorithms to convert the code of a grid cell into the lattitude and longitude of the center point of that grid cell; determine, for any lattitude and longitude, the code of the grid cell(s) that contain the coordinate. The system was designed tot provide a very short, unique, easy to remember, easy to communicate code for any location on earth, in essence matching the capabilities of the lattitude/longitude system, with the provision that it intended to be accurate only on the "human scale". "

It may also refer to the concept of a geodesic grid [2].


[1] https://portal.opengeospatial.org/files/?artifact_id=63668

[2] http://en.wikipedia.org/wiki/Geodesic_grid

From: Peter Baumann <p.baumann@jacobs-university.de<mailto:p.baumann@jacobs-university.de>>
Organization: Jacobs University Bremen
Date: Monday, 1 June 2015 20:53
To: Alejandro Llaves <allaves@fi.upm.es<mailto:allaves@fi.upm.es>>, Frans Knibbe <frans.knibbe@geodan.nl<mailto:frans.knibbe@geodan.nl>>
Cc: SDW WG Public List <public-sdw-wg@w3.org<mailto:public-sdw-wg@w3.org>>
Subject: Re: The "Resolution global grid" requirement
Resent-From: <public-sdw-wg@w3.org<mailto:public-sdw-wg@w3.org>>
Resent-Date: Monday, 1 June 2015 20:53

Hi Alejandro, Frans,

admittedly I also cannot imagine what's behind this requirement.

Should "represent" mean "can be served by W3C interfaces"? From a logical perspective, a [-180:+180] extent is just a special case (it seems not under consideration by this requirement what happens beyond that).

Should it mean that a coverage must be able to span the planet? This is not an interface question (which is the level I believe is discussed by W3C) but a matter of scalable implementation (which is individual to the tools out there). Desirable resolution, OTOH, is highly case dependent - 90m may or may not be adequate.

Bottom line: don't see the contribution of this requirement.


On 06/01/15 11:33, Alejandro Llaves wrote:
In this case, I directly copied the input from the spreadsheet (generated at the F2F meeting in Barcelona), so I would appreciate some help from people in the group with expertise in coverage data.


On 29 May 2015 at 15:06, Frans Knibbe <frans.knibbe@geodan.nl<mailto:frans.knibbe@geodan.nl>> wrote:
Hola Alejandro,

The Resolution global grid<http://w3c.github.io/sdw/UseCases/SDWUseCasesAndRequirements.html#ResolutionGlobalGrid> requirement is not clear to me. It reads "It should be possible to represent a medium resolution global grid, e.g. 90m raster data across the globe."

  *   What is meant by 'represent'?
  *   Why only a medium resolution grid? Is it already possible to represent high and low resolution global grids?


Frans Knibbe
President Kennedylaan 1
1079 MB Amsterdam (NL)

T +31 (0)20 - 5711 347<tel:%2B31%20%280%2920%20-%205711%20347>
E frans.knibbe@geodan.nl<mailto:frans.knibbe@geodan.nl>

Alejandro Llaves

Ontology Engineering Group (OEG)

Artificial Intelligence Department

Universidad Politécnica de Madrid

Avda. Montepríncipe s/n

Boadilla del Monte, 28660 Madrid, Spain



Dr. Peter Baumann
 - Professor of Computer Science, Jacobs University Bremen
   mail: p.baumann@jacobs-university.de<mailto: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<http://www.rasdaman.com>, mail: baumann@rasdaman.com<mailto: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)
Received on Monday, 1 June 2015 23:21:53 UTC

This archive was generated by hypermail 2.4.0 : Thursday, 24 March 2022 20:31:17 UTC