How to transform coordinate from WGS84 to a coordinate in a projection with PROJ.4?
java, map-projections, proj, proj4js, wgs84
Solution
55 is latitude or longitude?
EDIT: it seems you should simply swap lat and long parameters.
EDIT2: i.e.
Point2D.Double testLatLng = new Point2D.Double(12.7500, 55.0000);
Problem
I have a GPS-coordinate in WGS84 that I would like to transform to a map-projection coordinate in SWEREF99 TM using PROJ.4 in Java or Proj4js in JavaScript. Its hard to find documentation for PROJ.4 and how to use it. If you have a good link, please post it as a comment. The PROJ.4 parameters for SWEREF99 TM is `+proj=utm +zone=33 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs` I have tried to use a PROJ.4 Java library for transforming `Lat: 55° 00’ N, Long: 12° 45’ E` and tried with this code: ``` String[] proj4_w = new String[] { "+proj=utm", "+zone=33", "+ellps=GRS80", "+towgs84=0,0,0,0,0,0,0", "+units=m", "+no_defs" }; Projection proj = ProjectionFactory.fromPROJ4Specification(proj4_w); Point2D.Double testLatLng = new Point2D.Double(55.0000, 12.7500); Point2D.Double testProjec = proj.transform(testLatLng, new Point2D.Double()); ``` This give me the point `Point2D.Double[5197915.86288144, 1822635.9083898761]` but I should be `N: 6097106.672, E: 356083.438` What am I doing wrong? and what method and parameters should I use instead? The correct values is taken from Lantmäteriet. I am not sure if `proj.transform(testLatLng, new Point2D.Double());` is the right method to use.