CONVERSION.WGS84toRGF93 ( LAT ; LNG )

Coordinates conversion from WGS84 to RGF93

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Julien DESBORDES - Show more from this author
PRO-SOFT
https://www.pro-soft.fr

Sample input:

CONVERSION.WGS84toRGF93 ( 48,7392191589432946 ; 1,3444190060969376 )

Sample output:

578259,1000001036293813
6850065,1029809395512251

Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

/*
Author:		www.pro-soft.fr
Date:		2022-05-07
Dependencies:	artanh function

*/

Let (
       [

         $lat = LAT;
         $lng = LNG;

         $c = 11754255,42609;
         $e = ,0818191910428158 ;
         $n = ,725607765053267;
         $xs = 700000;
         $ys = 12655612,049876;

         $lat_rad = $lat / 180 * Pi;
         $lat_iso = artanh ( Sin ( $lat_rad ) ) - $e * artanh ( $e * Sin ( $lat_rad ) );

         $x = (($c * Exp(-1 * $n * ($lat_iso))) * Sin ( $n * ($lng-3) / 180 * Pi ) + $xs );
         $y = $ys - ( $c * Exp( -1 * $n * ($lat_iso) ) ) * Cos ( $n * ( $lng - 3) / 180 * Pi)

       ];

        List ( $x; $y )
)

Coordinates conversion from WGS84 to RGF93

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CONVERSION.WGS84toRGF93 ( LAT ; LNG )

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