Java: Convert lat/lon from EPSG:4236 to EPSG: 3857

问题:

How would I convert my lat lon to EPSG 3857 projection using geotools or another java library? I'm having trouble finding the proper methods to use. I know OpenLayers (javascript) can do it easily, but I don't see a clear path to getting these coordinates transformed.

I would like to see this transformation source lon, lat: -71.017942,  42.366662     destination lon, lat: -71 1.25820, 42 22.0932 

So I have created my CRS

final CoordinateReferenceSystem source = CRS.decode( "EPSG:4236" ); final CoordinateReferenceSystem dest = CRS.decode("EPSG:3857");  final MathTransform transform = CRS.findMathTransform(source, dest); 

But creating geometries doesn't seem straight forward with the points, as they are requiring a geometry factory or something..

I'm new to geo tools and geospatial data, thanks for any direction.

回答1:

Here's a solution for you:

CoordinateReferenceSystem sourceCRS = CRS.decode("EPSG:4326"); CoordinateReferenceSystem targetCRS = CRS.decode("EPSG:3857"); MathTransform transform = CRS.findMathTransform(sourceCRS, targetCRS, false); GeometryFactory geometryFactory = new GeometryFactory(new PrecisionModel(), 4326); Point point = geometryFactory.createPoint(new Coordinate(lon, lat)); Point targetPoint = (Point) JTS.transform(point, transform); 

文章来源: Java: Convert lat/lon from EPSG:4236 to EPSG: 3857