This is a nice way of creating cross-examples, though: http://openlayers.org/dev/examples/vector-formats.html
On Jun 22, 2012, at 3:35 PM, Joshua Lieberman wrote: > Good question. There used to be a nice set of examples on georss.org. I'll > have to track them down and get back to you with them. > > On Jun 22, 2012, at 3:25 PM, Dan Brickley wrote: > >> On 22 June 2012 21:22, Joshua Lieberman <[email protected]> wrote: >>> Dan, >>> >>> The coincident first and last positions in a polygon coordinate list are in >>> GeoRSS because they are specified that way in both OGC and ISO standards >>> and therefore implemented that way in most every piece of geospatial >>> software. It is hard to track down all of the reasons for this, but >>> technically the polygon boundary is defined by linear interpolation between >>> adjacent coordinate tuples, so it helps with consistency. The order of the >>> coordinate positions usually has topological significance as well. Pretty >>> much every polygon coordinate string in the world is constructed this way >>> (including the example in >>> (http://dev.iptc.org/rNews-10-The-Geo-Coordinates-Class , mangled a bit), >>> so it's an interoperability issue as far as reusing geodata. >>> >>> There are OWL / RDF representations defined for GeoRSS >>> (http://www.w3.org/2005/Incubator/geo/XGR-geo-20071023/W3C_XGR_Geo_files/geo_2007.owl) >>> and WKT or well-known-text (http://schemas.opengis.net/geosparql/) which >>> might also be useful for defining geo-schemas. >> >> Thanks! Very helpful :) Are there any 'classic' samples / test cases / >> examples for which we might usefully provide a schema.org version >> alongside GeoRSS / KML / etc versions of the same structure? >> >>> Cheers, >>> >>> Josh >>> >>> On Jun 22, 2012, at 10:57 AM, Dan Brickley wrote: >>> >>>> Hi folks >>>> >>>> Can I ask for some help with http://schema.org/GeoShape ? >>>> >>>> I'm working on http://schema.org/, and it's come to my attention that >>>> we have some half-baked geo stuff in there which I'd like to get >>>> fixed. See #geo logs below. Basically there are a bunch of structures >>>> derived from fairly similar stuff from IPTC's rNews 1.0, which itself >>>> seems based on GeoRSS. I'd like to fix up our docs to have plausible >>>> examples, as well link appropriately to GeoRSS and other related >>>> specs. >>>> >>>> There are more details in >>>> http://lists.w3.org/Archives/Public/public-vocabs/2012Jun/0116.html >>>> >>>> Thanks for any advice, >>>> >>>> Dan >>>> >>>> 14:36 danbri: ahem, >>>> http://stackoverflow.com/questions/10297279/what-are-the-appropriate-formats-for-the-properties-of-http-schema-org-geoshap/10466686 >>>> 14:36 danbri: seems like we've some geo- cleanup to do in >>>> http://schema.org/GeoShape ... advice welcomed >>>> 14:36 danbri: details >>>> http://lists.w3.org/Archives/Public/public-vocabs/2012Jun/0116.html >>>> 14:46 danbri: apparently schema.org geo is based on rNews is based on >>>> geoRss >>>> 14:47 danbri: and I'm told ... >>>> 14:47 danbri: 'In the GeoRSS spec, you'll see that the first and last >>>> actually are the same, 45.256 -110.45, <georss:polygon> 45.256 >>>> -110.45 46.46 -109.48 43.84 -109.86 45.256 -110.45 ' >>>> 14:47 danbri: in the rNews examples we don't have the repetition; I >>>> took it to be implicit and redundant. Thoughts? >>>> 14:49 danbri looks at http://www.georss.org/simple#Polygon >>>> 14:50 danbri: "A polygon contains a space separated list of >>>> latitude-longitude pairs, with each pair separated by whitespace. >>>> There must be at least four pairs, with the last being identical to >>>> the first (so a polygon has a minimum of three actual points)." >>>> 14:50 danbri: is the final one acting like a check? >>>> >>>> _______________________________________________ >>>> Geowanking mailing list >>>> [email protected] >>>> http://geowanking.org/mailman/listinfo/geowanking_geowanking.org >>> > > > _______________________________________________ > Geowanking mailing list > [email protected] > http://geowanking.org/mailman/listinfo/geowanking_geowanking.org _______________________________________________ Geowanking mailing list [email protected] http://geowanking.org/mailman/listinfo/geowanking_geowanking.org
