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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].


Bruce

[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.

-Peter



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.

Cheers,
Alejandro

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?

Saludos,
Frans

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Received on Monday, 1 June 2015 23:21:53 UTC

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