proj

Overview ¶

Package proj provides an interface to what once was the Cartographic Projections Library PROJ.4 [cartography].

See: https://proj.org

This version works with the newer PROJ library, starting with version 5.

Example usage:

merc, err := proj.NewProj("+proj=merc +ellps=clrk66 +lat_ts=33")
defer merc.Close() // if omitted, this will be called on garbage collection
if err != nil {
    log.Fatal(err)
}

ll, err := proj.NewProj("+proj=latlong")
defer ll.Close()
if err != nil {
    log.Fatal(err)
}

x, y, err := proj.Transform2(ll, merc, proj.DegToRad(-16), proj.DegToRad(20.25))
if err != nil {
    log.Fatal(err)
}
fmt.Printf("%.2f %.2f", x, y)  // should print: -1495284.21 1920596.79