CODEWITHSUNDEEP
javagisgeotoolsjts
Nikhil Karanjkar
Nikhil Karanjkar

Reputation: 105

Incorrect LineString is being drawn using Geotools

I am trying to draw a line on the earth using geotools but instead of considering the shortest distance between two points while drawing a line,The drawn lineString is taking a long route around the earth and providing wrong results.When i draw the same line on google maps the resulting route is being drawn correctly.The black and white map is using geotools and other one is from google maps.Can anyone please point me where i am going wrong PS: The coordinates are in log,lat

 Coordinate[] myLineString = new Coordinate[]{
                new Coordinate( -110.0,20.0),
                new Coordinate( 143.41666666666666,41.583333333333336 ),
                new Coordinate(  140.8,41.65)
        };
    Hints hints = new Hints(Hints.CRS, DefaultGeographicCRS.WGS84);
    GeometryFactory geometryFactory = JTSFactoryFinder.getGeometryFactory(hints);
    LineString lineString = geometryFactory.createLineString(coordinates);

enter image description here

enter image description here

Upvotes: 0

Views: 213

Answers (1)

Ian Turton
Ian Turton

Reputation: 10976

The simple answer is because you are using EPSG:4326 which has a discontinuity at +/- 180 degrees. So your line is represented in the "obvious" way.

The solution is to draw your map in another projection such as PDC Mercator (EPSG:3832) which will give you a map like:

enter image description here

As you can see there are a few issues with the background map as Greenland and Antarctica cross the new break at the map's edges.

Upvotes: 1

Related Questions