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[DL-Learner SVN] SF.net SVN: dl-learner:[1719] trunk
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From: <jen...@us...> - 2009-04-20 15:12:17
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Revision: 1719
http://dl-learner.svn.sourceforge.net/dl-learner/?rev=1719&view=rev
Author: jenslehmann
Date: 2009-04-20 15:12:11 +0000 (Mon, 20 Apr 2009)
Log Message:
-----------
method to find all geo-locations in DBpedia and write them to an N-Triple file
Modified Paths:
--------------
trunk/README
trunk/src/dl-learner/org/dllearner/kb/sparql/SparqlEndpoint.java
trunk/src/dl-learner/org/dllearner/scripts/matching/DBpediaLinkedGeoData.java
Added Paths:
-----------
trunk/src/dl-learner/org/dllearner/scripts/matching/DBpediaPoint.java
Modified: trunk/README
===================================================================
--- trunk/README 2009-04-20 12:14:59 UTC (rev 1718)
+++ trunk/README 2009-04-20 15:12:11 UTC (rev 1719)
@@ -14,4 +14,5 @@
DL-Learner is Open Source and licenced unter the GNU General Public License.
Documentation for DL-Learner (e.g. various configuration options) can be found
-in the "doc" directory and at http://dl-learner.org.
+in the "doc" directory and at http://dl-learner.org. We recommend to read
+doc/manual.pdf to get started.
Modified: trunk/src/dl-learner/org/dllearner/kb/sparql/SparqlEndpoint.java
===================================================================
--- trunk/src/dl-learner/org/dllearner/kb/sparql/SparqlEndpoint.java 2009-04-20 12:14:59 UTC (rev 1718)
+++ trunk/src/dl-learner/org/dllearner/kb/sparql/SparqlEndpoint.java 2009-04-20 15:12:11 UTC (rev 1719)
@@ -172,6 +172,18 @@
return new SparqlEndpoint(u, defaultGraphURIs, new LinkedList<String>());
}
+ public static SparqlEndpoint getEndpointLOCALGeoData() {
+ URL u = null;
+ try {
+ u = new URL("http://139.18.2.37:8890/sparql");
+ } catch (Exception e) {
+ e.printStackTrace();
+ }
+ LinkedList<String> defaultGraphURIs=new LinkedList<String>();
+ defaultGraphURIs.add("http://linkedgeodata.org");
+ return new SparqlEndpoint(u, defaultGraphURIs, new LinkedList<String>());
+ }
+
public static SparqlEndpoint getEndpointlocalJoseki() {
URL u = null;
try {
Modified: trunk/src/dl-learner/org/dllearner/scripts/matching/DBpediaLinkedGeoData.java
===================================================================
--- trunk/src/dl-learner/org/dllearner/scripts/matching/DBpediaLinkedGeoData.java 2009-04-20 12:14:59 UTC (rev 1718)
+++ trunk/src/dl-learner/org/dllearner/scripts/matching/DBpediaLinkedGeoData.java 2009-04-20 15:12:11 UTC (rev 1719)
@@ -20,6 +20,8 @@
package org.dllearner.scripts.matching;
import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URI;
@@ -28,6 +30,7 @@
import org.dllearner.kb.sparql.SPARQLTasks;
import org.dllearner.kb.sparql.SparqlEndpoint;
+import org.dllearner.kb.sparql.SparqlQuery;
import com.hp.hpl.jena.query.QuerySolution;
import com.hp.hpl.jena.query.ResultSet;
@@ -41,8 +44,24 @@
*/
public class DBpediaLinkedGeoData {
+ private static File dbpediaFile = new File("log/DBpedia_POIs.nt");
+ private static boolean regenerateFile = false;
+
+ private static SparqlEndpoint dbpediaEndpoint = SparqlEndpoint.getEndpointLOCALDBpedia();
+ private static SparqlEndpoint geoDataEndpoint = SparqlEndpoint.getEndpointLOCALGeoData();
+
public static void main(String[] args) throws IOException {
+ // download all objects having geo-coordinates from DBpedia if necessary
+ if(!dbpediaFile.exists() || regenerateFile) {
+ createDBpediaFile();
+ }
+
+ // read file point by point
+ // for each point: call match method
+
+ System.exit(0);
+
// we start from the DBpedia URI and try to find the corresponding
// OSM URI (assuming that each location having coordinates in Wikipedia also
// exists in OSM)
@@ -90,4 +109,58 @@
}
+ // downloads information about DBpedia into a separate file
+ private static void createDBpediaFile() throws IOException {
+
+ // use this to set the "chunk size" for getting DBpedia points
+ int limit = 1000;
+ int offset = 0;
+
+ int counter = 0;
+ FileOutputStream fos = new FileOutputStream(dbpediaFile, true);
+
+ do {
+ counter = 0;
+
+ // query DBpedia for all objects having geo-coordinates
+ String queryStr = "SELECT ?object, ?lat, ?long, ?label WHERE {";
+ queryStr += "?object <http://www.w3.org/2003/01/geo/wgs84_pos#lat> ?lat .";
+ queryStr += "?object <http://www.w3.org/2003/01/geo/wgs84_pos#long> ?long .";
+ queryStr += "?object rdfs:label ?label . }";
+ queryStr += "LIMIT " + limit + " OFFSET " + offset;
+
+ SparqlQuery query = new SparqlQuery(queryStr, dbpediaEndpoint);
+ ResultSet rs = query.send();
+
+ while(rs.hasNext()) {
+ QuerySolution qs = rs.nextSolution();
+
+ String object = qs.get("object").toString();
+ String geoLat = qs.getLiteral("lat").getString();
+ String geoLong = qs.getLiteral("long").getString();
+ String label = qs.getLiteral("label").getString();
+
+ String content = "<" + object + ">" + " <http://www.w3.org/2000/01/rdf-schema#label> \"" + label + "\" .\n";
+ content += "<" + object + ">" + " <http://www.w3.org/2003/01/geo/wgs84_pos#lat> \"" + geoLat + "\"^^<http://www.w3.org/2001/XMLSchema#float> .\n";
+ content += "<" + object + ">" + " <http://www.w3.org/2003/01/geo/wgs84_pos#long> \"" + geoLong + "\"^^<http://www.w3.org/2001/XMLSchema#float> .\n";
+
+ fos.write(content.getBytes());
+
+ counter++;
+ }
+
+ offset += limit;
+ System.out.println(offset + " points queried.");
+
+ } while(counter == limit);
+
+
+ fos.close();
+
+ }
+
+ private static URI findLinkedGeoDataMatch(DBpediaPoint dbpediaPoint) {
+
+ return null;
+ }
}
Added: trunk/src/dl-learner/org/dllearner/scripts/matching/DBpediaPoint.java
===================================================================
--- trunk/src/dl-learner/org/dllearner/scripts/matching/DBpediaPoint.java (rev 0)
+++ trunk/src/dl-learner/org/dllearner/scripts/matching/DBpediaPoint.java 2009-04-20 15:12:11 UTC (rev 1719)
@@ -0,0 +1,28 @@
+/**
+ * Copyright (C) 2007-2009, Jens Lehmann
+ *
+ * This file is part of DL-Learner.
+ *
+ * DL-Learner is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * DL-Learner is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+package org.dllearner.scripts.matching;
+
+/**
+ * @author Jens Lehmann
+ *
+ */
+public class DBpediaPoint {
+
+}
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