Latest posts for the topic "Retrieve Wikipedia information by URL"

Retrieve Wikipedia information by URL

bradamant — GMT

I'm processing some data where I will have the title (and thus, once it's encoded, the URL) of some Wikipedia articles that I want the coordinates for. I can't find an example of doing this using the Java APi, though it seems to work fine on the web (http://api.geonames.org/wikipediaSearch?title=Philadelphia&maxRows=1&username=demo). Naively, I want something like this: Code:

 myPlace.setWikipediaUrl("http://en.wikipedia.org/wiki/Philadelphia"); //OR
myPlace.setTitle("Philadelphia"); //and then...
Double lat = myPlace.getLatitude();
Double lon = myPlace.getLongitude();

But that doesn't actually search anything. However, Webservice.wikipediaSearch doesn't look like it allows you specify the title or URL. Doing this would make my app much more efficient; if I know the article is talking about [[Philadelphia]] I can get the coordinates for the exact place that is meant, whereas a simple search of Geonames for "philadelphia" has 2000+ results!

Re:Retrieve Wikipedia information by URL

marc — GMT

di you try the method Webservice.wikipediaSearchForTitle(title,language) ? Marc

Re:Retrieve Wikipedia information by URL

bradamant — GMT

Yes, I tried that last week as well. Code:

WebService.setUserName("myUsername");
List wikiResults = WebService.wikipediaSearchForTitle(
                                "Philadelphia","en");
for (WikipediaArticle r : wikiResults) {
     System.out.println(r.getLatitude());
}

Errors start with: Code:

Exception in thread "main" java.lang.NoClassDefFoundError: org/jdom/input/SAXBuilder
	at org.geonames.WebService.wikipediaSearchForTitle(Unknown Source)
	at parsetextandurls.ParseTextAndURLs.main(ParseTextAndURLs.java:100)
Caused by: java.lang.ClassNotFoundException: org.jdom.input.SAXBuilder
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
	... 2 more

It seems like a jdom error, which doesn't appear to be required (if I "import org.jdom.input.SAXBuilder;" it gets marked as unused, too). I tried adding jdom-1.1 to the classpath and still get the same result.

Re:Retrieve Wikipedia information by URL

marc — GMT

jdom is used by the library not directly by your code. You don't have to import it in your code, but it needs to be on the classpath. I suspect there is something wrong with your classpath. Best Marc

Re:Retrieve Wikipedia information by URL

bradamant — GMT

Thanks, once I knew I was on the right track I was able to solve the classpath problem. But now that the function's working, I don't think it does quite what I need. For example, if I search for Louisiana, the first result is Shreveport, Louisiana (latitude 32.4681) whereas I want just Louisiana (latitude 31.0139). (For some other searches like Philadelphia, the first result *is* the desired one.) I already have a function that does a non-exact search of toponym names in GeoNames if it encounters one in free text; I was hoping that if I knew with 100% certainty that a specific Wikipedia article was meant (because it's [[linked]]), I could retrieve just that one location using this alternate method. Is there any way to do that?

Re:Retrieve Wikipedia information by URL

marc — GMT

You can iterate over the result list and get the one with the same name/url. Best Regards Marc