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RE: URI's for Geogrid like Resource

From: Søren Roug <Soren.Roug@eea.europa.eu>
Date: Mon, 14 Jun 2010 14:30:59 +0200
To: Peter DeVries <pete.devries@gmail.com>, "public-lod@w3.org" <public-lod@w3.org>
Message-ID: <ECDBB484CB145E429AAB0661F935E4E3026B10A08F0E@SLOTHMAIL.eea.eu.int>
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



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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
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Received on Monday, 14 June 2010 12:31:33 UTC

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