Projections

Jeo utilizes the Proj4J library for projection and coordinate reference system support.

The Proj class provides convenience methods for creating coordinate reference system objects and performing transformations between them.

// canonical geopgraphic
CoordinateReferenceSystem crs1 = Proj.crs("epsg:4326");

// google mercator
CoordinateReferenceSystem crs2 = Proj.crs("+proj=merc", "+a=6378137",
 "+b=6378137", "+lat_ts=0.0", "+lon_0=0.0", "+x_0=0.0", "+y_0=0", "+k=1.0",
 "+units=m", "+nadgrids=@null", "+wktext", "+no_defs");

// re-project
Point p = Geom.point(-115, 51);
p = Proj.reproject(p, crs1, crs2);