我有一个LineString序列，例如lineString1和lineString2
其中lineString1.getEndPoint() == lineString2.getStartPoint()或lineString1.getStartPoint() == lineString2.getEndPoint()
我想获取将LineString和MultiLineString组合在一起的lineString1对象（不是lineString2）。
我没有找到任何好的解决方案。
最佳答案
您需要使用JTS LineMerger来实现，它返回一个Collection<LineString>，但是在您的示例中，这是一行，因为它们连接在一起（在其他情况下，只有某些行可以接触）。
import java.util.Collection;
import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.geom.LineString;
import com.vividsolutions.jts.io.ParseException;
import com.vividsolutions.jts.io.WKTReader;
import com.vividsolutions.jts.operation.linemerge.LineMerger;
public class LineJoin {
public static void main(String[] args) throws ParseException {
/*String[] WKTS = { "LINESTRING (254058.76074485347 475001.2186020431, 255351.04293761664 474966.9279243938)",
"LINESTRING (255351.04293761664 474966.9279243938, 255529.29662365236 474272.4599921228)",
"LINESTRING (255529.29662365236 474272.4599921228, 256166.05830998957 473979.44920198264)",
"LINESTRING (256166.05830998957 473979.44920198264, 256082.8878282134 472762.2531920295)",
"LINESTRING (256082.8878282134 472762.2531920295, 254245.37250651795 472802.681197444)",
"LINESTRING (254245.37250651795 472802.681197444, 254294.87550167093 473782.10435392085)",
"LINESTRING (255802.5570897992 475306.663459122, 256973.3861333156 473826.71649389854)",
"LINESTRING (256973.3861333156 473826.71649389854, 256996.781511873 472271.0759416939)",
"LINESTRING (254134.08645022905 471750.25133671844, 253091.20265363617 473772.75685744354)",
"LINESTRING (252764.19811300343 475015.97340571403, 253526.90397945273 476194.3201198712)",
"LINESTRING (253526.90397945273 476194.3201198712, 254983.29259833007 475930.5996061625)" };*/
String[] WKTS = {"LINESTRING(10 40,11 41)","LINESTRING(11 41,12 42)"};
WKTReader reader = new WKTReader();
LineMerger merger = new LineMerger();
for (String wkt : WKTS) {
Geometry geom = reader.read(wkt);
merger.add(geom);
}
Collection<LineString> collection = merger.getMergedLineStrings();
for (LineString l : collection) {
System.out.println(l);
}
}
}
对于您的测试输入，它给出：
LINESTRING (10 40, 11 41, 12 42)
对于已注释掉的WKT，您将获得：
LINESTRING (252764.19811300343 475015.97340571403, 253526.90397945273 476194.3201198712, 254983.29259833007 475930.5996061625)
LINESTRING (254134.08645022905 471750.25133671844, 253091.20265363617 473772.75685744354)
LINESTRING (254058.76074485347 475001.2186020431, 255351.04293761664 474966.9279243938, 255529.29662365236 474272.4599921228, 256166.05830998957 473979.44920198264, 256082.8878282134 472762.2531920295, 254245.37250651795 472802.681197444, 254294.87550167093 473782.10435392085)
LINESTRING (255802.5570897992 475306.663459122, 256973.3861333156 473826.71649389854, 256996.781511873 472271.0759416939)