CityLookup

A GeoInfo use case...

weather underground is a great source of data;

cityLookup is a start at N3 rules for mapping city names to lat/long. by DanConnolly, 2003/03/10.

The input data should look like this:

<r:RDF
  xmlns:r="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
  xmlns:k="http://opencyc.sourceforge.net/daml/cyc.daml#"
  xmlns:usps="http://www.w3.org/2000/10/swap/pim/usps#"
  xmlns:map="http://www.w3.org/2000/10/swap/pim/earthMap#"
>
  <r:Description r:about="#austin">
        <map:cityName>Austin</map:cityName>
         <k:inRegion>
          <r:Description>
            <usps:stateAbbr>TX</usps:stateAbbr>
          </r:Description>
        </k:inRegion>
  </r:Description>
</r:RDF>

Then (see CwmTips if you don't have cwm running yet) you run cwm like this...

$ python cwm.py --chatty=15 --rdf input.rdf \
    --n3 http://www.w3.org/2000/10/swap/pim/cityLookup --think \
    --purge-rules >,out.rdf

The --chatty=15 flag produces some diagnostics like this...

Reading getForecast?query=Austin%2CTX
Concluding definitively CITY->austin  PG->getForecast?query=Austin%2CTX  LON->"-97.7505"  LAT->"30.30587"  _g24->0_work

and the output looks like this:

<r:RDF
    xmlns:cityl="file:/home/connolly/w3ccvs/WWW/2000/10/swap/pim/cityLookup#"
    xmlns:geo="http://www.w3.org/2003/01/geo/wgs84_pos#"
    xmlns:k="http://opencyc.sourceforge.net/daml/cyc.daml#"
    xmlns:map="http://www.w3.org/2000/10/swap/pim/earthMap#"
    xmlns:r="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
    xmlns:usps="http://www.w3.org/2000/10/swap/pim/usps#">
 
    <r:Description r:about=",aus.rdf#austin">
        <cityl:formVal>Austin%2CTX</cityl:formVal>
        <cityl:weatherPage r:resource="http://www.wunderground.com/cgi-bin/findweather/getForecast?query=Austin%2CTX"/>
        <k:inRegion r:parseType="Resource">
            <usps:stateAbbr>TX</usps:stateAbbr>
        </k:inRegion>
        <map:cityName>Austin</map:cityName>
        <geo:lat>30.30587959</geo:lat>
        <geo:long>-97.75051880</geo:long>
    </r:Description>
</r:RDF>

For a more complex example, see Dan Connolly's travel schedule in RDF scraped from his homepage and munged ala the above. Details are in the Makefile.