conv.go

package main

import (
	"fmt"
	proj "github.com/pebbe/go-proj-4/proj"
)

const (
	// Epsg = "+init=epsg:27572"
	Epsg = "+proj=lcc +lat_1=46.8 +lat_0=46.8 +lon_0=2.33722917 +k_0=0.99987742 +x_0=600000 +y_0=2200000 +a=6378249.2 +pm=paris +units=m +no_defs no_defs <>"
	// Epsg = "+proj=lcc +lat_1=46.8 +lat_0=46.8 +lon_0=0 +k_0=0.99987742 +x_0=600000 +y_0=2200000 +a=6378249.2            +pm=paris +units=m +no_defs no_defs <>"
	// Epsg = "+proj=lcc +lat_1=46.8 +lat_0=46.8 +lon_0=0 +k_0=0.99987742 +x_0=600000 +y_0=2200000 +a=6378249.2 +b=6356515 +pm=paris +units=m +no_defs no_defs <>"
)

func main() {
	// BONNE NOUVELLE
	//     lat := 48.8674451
	//     long := 2.3496033

	// Orly Ouest
	lat := 48.729664
	long := 2.360143

	l2et, _ := proj.NewProj(Epsg)
	x, y, _ := proj.Fwd(l2et, long, lat)
	fmt.Printf("x/y : %.2f %.2f\n", x, y)
}

@nono : vaut ptet mieux rajouter le param +b=6356515