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Re: URI's for Geogrid like Resource

From: Peter DeVries <pete.devries@gmail.com>
Date: Mon, 14 Jun 2010 15:30:54 -0500
Message-ID: <AANLkTinxqfughqsSuzKPQNjNqRZ5ZCbGCY7CVNIePxeN@mail.gmail.com>
To: Søren Roug <Soren.Roug@eea.europa.eu>
Cc: "public-lod@w3.org" <public-lod@w3.org>
Hi Søren,

People will correct me if I am wrong but I think that rdf:Bag causes
problems with SPARQL queries, but I like what you are suggesting and it may
be that there is some other way to get this goal
achieved. In the RDF example, I think I have the geonames URI for the
Country "US". This then tags this geogrid as being in the US.

The difference between this an other approaches is that each box is "square"
and has the same area. Solutions that create grids that are based on degrees
will get more rectangular the farther that you get from the equator. The
nearly equal area of this approach will be helpful for species or
individuals / area.

I kind of like the idea of keeping the extent in the URI. If you start
making geogrids of 1km x 1km as regular resources you will need a lot of RDF
just to cover the planet. It would seem to be a big
RAM commitment for your triple store. Having the extent included in the URI
means that supporting triple stores would know how to interpret all of them.
This way I just need to make statements about
the geogrids for which I have records, not the entire surface of the planet.

- Pete

On Mon, Jun 14, 2010 at 7:30 AM, Søren Roug <Soren.Roug@eea.europa.eu>wrote:

>  I doubt that encoding the geospatial extent into the URI is a good idea.
> It would be preferable to add a bounding box property to existing resources.
> If you go to Wisconsin in GeoNames (
> http://linkeddata.uriburner.com/about/html/http/sws.geonames.org/5279468/)
> you'll see a "geo:geometry" property. It has the limitation that it can only
> handle points. But you could have an x:boundedBy property that takes four
> values. West, South, East, North.
>
>
>
> Now, this matches your need for a geogrid URI, and it is quite easy to
> convert to KML. But as soon as you try to put a bounding box around USA, you
> run into problems with Hawaii and Alaska. My proposal allows you to have
> several bounding boxes inside an <rdf:Bag> or by just repeating the
> property.
>
>
>
> Best regards,
>
> Søren Roug
>
>
>
>
>
>
>
> *From:* public-lod-request@w3.org [mailto:public-lod-request@w3.org] *On
> Behalf Of *Peter DeVries
> *Sent:* 11 June 2010 17:20
> *To:* public-lod@w3.org
> *Subject:* URI's for Geogrid like Resource
>
>
>
> Hi LOD'ers,
>
>
>
> In the GeoSpecies data set I have a predicate isExpectedIn.
>
>
>
> This is used to state that a given species is expected in a geographical
> area.
>
>
>
> Most of the time I use the geonames features as the object
>
>
>
> So <
> http://linkeddata.uriburner.com/about/html/http/lod.geospecies.org/ses/mCcSp>
>
> http://lod.geospecies.org/ses/mCcSp<http://linkeddata.uriburner.com/about/html/http/lod.geospecies.org/ses/mCcSp>
>
> geospecies:isExpectedIn<http://linkeddata.uriburner.com/about/html/http/rdf.geospecies.org/ont/geospecies%01isExpectedIn>
>
> §  http://sws.geonames.org/6255149/<http://linkeddata.uriburner.com/about/html/http/sws.geonames.org/6255149/>
>
> §  http://sws.geonames.org/5279468/<http://linkeddata.uriburner.com/about/html/http/sws.geonames.org/5279468/>
>
> §  http://sws.geonames.org/4862182/<http://linkeddata.uriburner.com/about/html/http/sws.geonames.org/4862182/>
>
> §  http://sws.geonames.org/5037779/<http://linkeddata.uriburner.com/about/html/http/sws.geonames.org/5037779/>
>
> §  http://sws.geonames.org/5001836/<http://linkeddata.uriburner.com/about/html/http/sws.geonames.org/5001836/>
>
> I also do the reverse link so you can query what species are in what
> geonames feature
>
>
>
>
>
> <!-- Wisconsin State Link Out -->
>
>   <geospecies:State rdf:about="http://sws.geonames.org/5279468/">
>
>     <geospecies:hasExpectationOf rdf:resource="http://lod.geospecies.org/ses/mCcSp"/>
>
>   </geospecies:State>
>
>  At present this just get's me to county, and I have always wanted to get
> something that was more uniform and global.
>
>
>
> This would need URI's that are of a grid equally sized polygons that are
> either equal in X, Y by either decimal degrees or meters.
>
>
>
> I marked up this example, that is a one tenth decimal degree by 1 tenth
> decimal degree. It is rectangular in actual distance (meters/kilometers)
>
>
>
> http://lod.taxonconcept.org/examples/geogrid/10/N93d0_37d1_W93d0_37d1.html
>
>
>
> http://lod.taxonconcept.org/examples/geogrid/10/N93d0_37d1_W93d0_37d1.rdf
>
>
>
> What I am wondering is, is there already an existing set of URI's that do
> the same sort of thing?
>
>
>
> Has anyone been able to create valid RDFa that also works with GoogleMaps?
>
>
>
> Thanks!
>
>
>
> - Pete
>
>
>
>
>
>
> ----------------------------------------------------------------
> Pete DeVries
> Department of Entomology
> University of Wisconsin - Madison
> 445 Russell Laboratories
> 1630 Linden Drive
> Madison, WI 53706
> GeoSpecies Knowledge Base
> About the GeoSpecies Knowledge Base
> ------------------------------------------------------------
>



-- 
----------------------------------------------------------------
Pete DeVries
Department of Entomology
University of Wisconsin - Madison
445 Russell Laboratories
1630 Linden Drive
Madison, WI 53706
GeoSpecies Knowledge Base
About the GeoSpecies Knowledge Base
------------------------------------------------------------
Received on Monday, 14 June 2010 20:31:28 UTC

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