pborissow/JTS.md

## JTS.md

      
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              JTS.md
            
          
    How to create PostGIS HEXEWKB formatted geometry

When copying geometry data into PostgreSQL using COPY FROM STDIN it is a good idea to use the PostGIS HEXEWKB format.
Here's how to create HEXEWKB using Java and JTS:
import com.vividsolutions.jts.geom.*;
import com.vividsolutions.jts.io.WKBWriter;
import com.vividsolutions.jts.io.WKTReader;
import com.vividsolutions.jts.io.ByteOrderValues;

PrecisionModel precisionModel = new PrecisionModel();
GeometryFactory geometryFactory = new GeometryFactory(precisionModel, 4326);

WKBWriter wkbWriter = new WKBWriter(2, ByteOrderValues.LITTLE_ENDIAN, true);
byte[] b = wkbWriter.write(geometryFactory.createPoint(new Coordinate(longitude, latitude)));
String hex = WKBWriter.toHex(b);
Of course, you can create a geometry using WKT like this:
WKTReader wktReader = new WKTReader(geometryFactory);
Geometry geom = wktReader.read(point);
byte[] b = wkbWriter.write(geom);
String hex = WKBWriter.toHex(b);