Java, convert lat/lon to UTM

Question

Does anyone know of a way, in Java, to convert an earth surface position from lat, lon to UTM (say in WGS84)? I'm currently looking at Geotools but unfortunately the solution is not obvious.

Answer 1

This problem is analogous to the one in this post. If you look at the solutions to it, you can easily adapt them to UTM.

Answer 2

Hi Steve - the Alberta 10 TM answer is probably overkill for what you need - this link from developer works probably has all the information you need.

Answer 3

Take a look at OpenMap specifically the com.bbn.openmap.proj.coords package in the API.

Answer 4

Steve Dutch at University of Wisconson has a pretty good write-up on the algorithm. Also includes an Excel document to help verify your numbers.

Answer 5

I was able to use Geotools 2.4 to get something that works, based on some example code.

double utmZoneCenterLongitude = ...  // Center lon of zone, example: zone 10 = -123
int zoneNumber = ...                 // zone number, example: 10
double latitude, longitude = ...     // lat, lon in degrees

MathTransformFactory mtFactory = ReferencingFactoryFinder.getMathTransformFactory(null);
ReferencingFactoryContainer factories = new ReferencingFactoryContainer(null);

GeographicCRS geoCRS = org.geotools.referencing.crs.DefaultGeographicCRS.WGS84;
CartesianCS cartCS = org.geotools.referencing.cs.DefaultCartesianCS.GENERIC_2D;

ParameterValueGroup parameters = mtFactory.getDefaultParameters("Transverse_Mercator");
parameters.parameter("central_meridian").setValue(utmZoneCenterLongitude);
parameters.parameter("latitude_of_origin").setValue(0.0);
parameters.parameter("scale_factor").setValue(0.9996);
parameters.parameter("false_easting").setValue(500000.0);
parameters.parameter("false_northing").setValue(0.0);

Map properties = Collections.singletonMap("name", "WGS 84 / UTM Zone " + zoneNumber);
ProjectedCRS projCRS = factories.createProjectedCRS(properties, geoCRS, null, parameters, cartCS);

MathTransform transform = CRS.findMathTransform(geoCRS, projCRS);

double[] dest = new double[2];
transform.transform(new double[] {longitude, latitude}, 0, dest, 0, 1);

int easting = (int)Math.round(dest[0]);
int northing = (int)Math.round(dest[1]);

Answer 6

I suggest JCoord. It allows you to convert between various cartographic coordinate schemes using a very simple API.

Iy you're feeling saucy, have a look at the source code; it's pages and pages of dense trigonometry. Splendid stuff.

There's also a javascript version called JSCoord.