- From: Peter Baumann <p.baumann@jacobs-university.de>
- Date: Tue, 28 Apr 2015 17:54:16 +0200
- To: "Mcgibbney, Lewis J (398M)" <Lewis.J.Mcgibbney@jpl.nasa.gov>, "Little, Chris" <chris.little@metoffice.gov.uk>, "thiago.avila@ic.ufal.br" <thiago.avila@ic.ufal.br>, "Kerry.Taylor@csiro.au" <Kerry.Taylor@csiro.au>
- CC: "public-sdw-wg@w3.org" <public-sdw-wg@w3.org>
- Message-ID: <553FAD28.8050405@jacobs-university.de>
Hi Lewis,
WCS [1] defines subsetting in space and time, differentiating between
- trimming: just pick an interval along any axis; retains number of dimensions
- slicing: extract hyperslab at a particular point along any axis; reduces
dimensionality
WCS has large and growing implementation list, such as rasdaman (ref impl),
GeoServer, EOxServer, MapServer, GDAL, Pyxis, ESRI ArcGIS.
WCPS (Web Coverage Processing Service) [2] embeds this into a spatio-temporal
geo raster processing language.
WCPS is front end to 130+ TB space/time datacubes at European Space Agency
(ESA), and single queries have been split over 1,000+ cloud nodes. Currently we
are leaving harbour for crossing the PB frontier.
Both are based on CRSs which integrate space _and_ time through an ad-hoc
combination mechanism defined over URIs which the OGC CRS resolver understands.
For a small demo of 1D through 5D use cases see http://standards.rasdaman.com/
cheers,
Peter
Refs:
[1] http://en.wikipedia.org/wiki/Web_Coverage_Service
[2] http://en.wikipedia.org/wiki/Web_Coverage_Processing_Service
On 04/23/15 18:27, Mcgibbney, Lewis J (398M) wrote:
> Hi Chris,
> Can you show us a concrete example if one exists? Are slices of the data
> available anywhere? I am intrigued.
> In JPL’s PO.DAAC (Physical Oceanographic Data Active Archive Centre) there are
> a number of solutions aimed at improving/lowering the barrier to data access
> http://podaac.jpl.nasa.gov/dataaccess
>
> In the use case you mention, I would imagine it would be possible to reference
> and hence locate then extract geo-referenced granules for some given parameter(s).
> We do that in PO.DAAC in a number of ways
> http://podaac.jpl.nasa.gov/ws/
>
> Example usage for extracting granules
>
> *Example 1:* Extract granule with Dataset ID = PODAAC-QSX25-L2B02, shortName
> of QSCAT_LEVEL_2B_V2, granuleName QS_S2B54295.20093261514, offset the region
> contained within -135.0 W, 30.0 N, -120.0 W, 40.0 N, have it save as netcdf.
>
> http://podaac.jpl.nasa.gov/ws/extract/granule?shortName=ASCATA-L2-25km&granuleName=ascat_20130719_230600_metopa_35024_eps_o_250_2200_ovw.l2.nc&bbox=-180,-90,180,90&format=netcdf
>
> If this is totally off, then excuse me. If it contributes to conversation then
> I would be glad to hear more about your Meteorology use case here as I have
> little to do with data from this domain.
> Lewis
>
> Dr. Lewis John McGibbney Ph.D., B.Sc., MAGU
> Engineering Applications Software Engineer Level 2
> Computer Science for Data Intensive Systems Group 398M
> Jet Propulsion Laboratory
> California Institute of Technology
> 4800 Oak Grove Drive
> Pasadena, California 91109-8099
> Mail Stop : 158-256C
> Tel: (+1) (818)-393-7402
> Cell: (+1) (626)-487-3476
> Fax: (+1) (818)-393-1190
> Email: lewis.j.mcgibbney@jpl.nasa.gov
>
>
>
> Dare Mighty Things
>
> From: <Little>, Chris <chris.little@metoffice.gov.uk
> <mailto:chris.little@metoffice.gov.uk>>
> Date: Thursday, April 23, 2015 at 1:31 AM
> To: "thiago.avila@ic.ufal.br <mailto:thiago.avila@ic.ufal.br>"
> <thiago.avila@ic.ufal.br <mailto:thiago.avila@ic.ufal.br>>,
> "Kerry.Taylor@csiro.au <mailto:Kerry.Taylor@csiro.au>" <Kerry.Taylor@csiro.au
> <mailto:Kerry.Taylor@csiro.au>>
> Cc: "public-sdw-wg@w3.org <mailto:public-sdw-wg@w3.org>" <public-sdw-wg@w3.org
> <mailto:public-sdw-wg@w3.org>>
> Subject: RE: Princples...
> Resent-From: <public-sdw-wg@w3.org <mailto:public-sdw-wg@w3.org>>
> Resent-Date: Thursday, April 23, 2015 at 1:31 AM
>
> Thiago, Kerry
>
>
>
> Meteorology has use cases where linked data/RDF/triple stores/etc are not
> appropriate. Take a large (~1TByte) 5 dimensional data cube identified by
> only one URI/link, of one parameter, say the vector wind speed and
> direction, and it is replaced every 6 hours. The data is all
> geo-referenced, and users wish to extract much more manageable subsets.
>
>
>
> At this stage, I am not sure whether *all*practices of W3C Best Practices
> for Publishing Linked Data <http://www.w3.org/TR/ld-bp/>
>
> are helpful.
>
>
>
> Chris
>
>
>
> *From:*Kerry.Taylor@csiro.au <mailto:Kerry.Taylor@csiro.au>
> [mailto:Kerry.Taylor@csiro.au]
> *Sent:* Thursday, April 23, 2015 8:01 AM
> *To:* thiago.avila@ic.ufal.br <mailto:thiago.avila@ic.ufal.br>;
> public-sdw-wg@w3.org <mailto:public-sdw-wg@w3.org>
> *Subject:* RE: Princples...
>
>
>
> Thiago,
>
> I do not think we should be reiterating those practices – that is not our
> job. It would be unfortunate if we were contradictory, though.
>
>
>
> In our case, it is not obvious to what extent this group is focusing on
> linked data, or not, and I think our views in the group may be divergent.
>
>
>
> The UCR document should be “A document setting out the range of problems
> that the working groups are trying to solve.” So in that context I
> thought to bring up the question ( deliberately phrased in the form that
> reflects my point of view!).
>
>
>
> Kerry
>
>
>
> *From:*Thiago José Tavares Ávila [mailto:thiago.avila@ic.ufal.br]
> *Sent:* Thursday, 23 April 2015 10:32 AM
> *To:* public-sdw-wg@w3.org <mailto:public-sdw-wg@w3.org>
> *Subject:* Re: Princples...
>
>
>
> Hello Kerry,
>
>
>
> For 5th principle, Does geospatial data must follow all practices of W3C
> Best Practices for Publishing Linked Data <http://www.w3.org/TR/ld-bp/> ?
>
>
>
> Regards. Thiago
>
>
>
> 2015-04-19 23:26 GMT-03:00 <Kerry.Taylor@csiro.au
> <mailto:Kerry.Taylor@csiro.au>>:
>
> Here's 2 suggestions ( that may need improvement).
>
>
>
> No 5. That community good practice for 5 star linked data be followed,
> including the use of so-called cool uris and ontology annotations (
> references need to be attached)
>
>
>
> No 6. That ontologies conform (" are valid" ? check) to the language of
> owl2 dl.
>
> (The latter is important for spatial and temporal reasoning.)
>
>
>
> No 7. ( perhaps number 0) That these principles are aimed specifically at
> data published in RDF but where appropriate may also apply to other
> spatial data published on the web.
>
>
> Kerry
>
>
>
> On 20 Apr 2015, at 8:17 am, "John Machin" <john.machin@abs.gov.au
> <mailto:john.machin@abs.gov.au>> wrote:
>
> Hi Ed, Andreas,
>
> I like the proposed principles so far.
>
> Based on some of the comments in the last call, I wonder if we have to
> have a principle related to keeping the practices up to date?
>
> I realise that this might over-commitment from a WG with a specified
> lifespan but if maintaining currency is a principle then the two
> sponsor organisations may be encouraged to reconvene WGs to review and
> update the Best Practices periodically.
>
> Cheers,
> *--
> John Machin*
>
> <graycol.gif>Andreas Harth ---18/04/2015 05:57:59 AM---Hi Ed, On
> 2015-04-16 14:10, Ed Parsons wrote:
>
> From: Andreas Harth <harth@kit.edu <mailto:harth@kit.edu>>
> To: <public-sdw-wg@w3.org <mailto:public-sdw-wg@w3.org>>,
> Date: 18/04/2015 05:57 AM
> Subject: Re: Princples...
>
> --------------------------------------------------------------------------------
>
>
>
>
> Hi Ed,
>
> On 2015-04-16 14:10, Ed Parsons wrote:
> > So to start the ball rolling....
> >
> > Princple No.1 : The linkabilty of Geospatial Information published on
> > the web should be improved.
> >
> [...]
> >
> > Princple No.2 : We will not reinvent
> >
> [...]
> >
> > Feel free to add to these, develop more ... when we reach a level of
> > agreement I will transfer them over to the wiki
>
> How about the following?
>
> Principle No.3 : Best Practices have to be visible.
>
> We will link to at least one (or two, three?) publicly available
> example(s) of a non-toy dataset that follows the best practice.
>
> Cheers,
> Andreas.
>
>
>
--
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)
Received on Tuesday, 28 April 2015 15:54:52 UTC