/**
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException {
ZoneCollection zones = new ZoneCollection();
String data =
new String(
Files.readAllBytes(Paths.get("/home/johannes/gsv/gis/nuts/de.nuts3.gk3.geojson")));
zones.addAll(ZoneGeoJsonIO.parseFeatureCollection(data));
data = null;
zones.setPrimaryKey("gsvId");
Map<String, Set<Zone>> aggZones = new HashMap<>();
for (Zone zone : zones.getZones()) {
String code = zone.getAttribute("nuts2_code");
Set<Zone> set = aggZones.get(code);
if (set == null) {
set = new HashSet<>();
aggZones.put(code, set);
}
set.add(zone);
}
Set<Zone> newZones = new HashSet<>();
for (Entry<String, Set<Zone>> entry : aggZones.entrySet()) {
Set<Zone> set = entry.getValue();
Geometry refGeo = null;
for (Zone zone : set) {
if (refGeo != null) {
Geometry geo2 = zone.getGeometry();
refGeo = refGeo.union(geo2);
} else {
refGeo = zone.getGeometry();
}
}
Zone zone = new Zone(refGeo);
zone.setAttribute("nuts2_code", entry.getKey());
newZones.add(zone);
}
data = ZoneGeoJsonIO.toJson(newZones);
Files.write(
Paths.get("/home/johannes/gsv/gis/nuts/de.nuts2.gk3.geojson"),
data.getBytes(),
StandardOpenOption.CREATE);
}
