CH1903 WGS84 Conversion

Here the signatures of the single functions:

/* 
 * CH1903 <=> WGS84 Approx
 *
 * Implementation of the approximative conversion function 
 * of the federal swiss topological institute.
 * © nico waldispuehl 08
 *
 * Results are sufficiently precise on the area of switzerland. 
 */


 /*
  * Double toSexagesimalSec(Double x)
  *
  * Transforms a value from degrees to sexagesimalsecs.
  * Takes a double value as input and returns a double value.
  *
  * Is used as a helper function for the conversion functions
  */

 /*
  * Array(Double, Double) swissGridToCoords(Integer y, Integer x)
  *
  * Transforms a coordinate from the swiss grid system to
  * actual world coordinates in longitude and latitude.
  *
  * Takes two integers as input. Returns an array of doubles.
  *
  * Note that the names of the input arguments are misleading 
  * because of a inconsistency of the swiss grid with a common
  * coordinate system; y is the longitudial part (from right) and
  * x is the latitudial part (from bottom).
  *
  * Use the usual form to input the data; to convert a swiss grid
  * coordinate of let’s say 600000/200000 use the function as follows:
  *
  * var result = swissGridToCoords(600000, 200000);
  *
  * result contains now: 46.951081, 7.438637
  */

 /*
  * Array(Integer, Integer) coordsToSwissGrid(Double lat, Double lng)
  *
  * Transforms a coordinate from the world coordinate system to
  * the swiss grid coordinate system.
  *
  * Takes the doubles latitude and longitude as input and returns
  * an array of two integers as output.
  *
  * var result = coordsToSwissGrid(46.951081, 7.438637);
  *
  * result now contains 600000, 200000
  *
  */

Download: latlng_coord_approx.js