How do you pass in array of points to a spline mesh component

I see the error:

let Xnew = (((MapSizeUE - 1) * Scale) / MapRangeX) * (Long - Xm)
let Ynew = (((MapSizeUE - 1) * Scale) / MapRangeY) * (Lat - Ym) * -1

you have to use
let Xnew = ((((MapSizeUE - 1) * Scale) / MapRangeX) * Long) - Xm
let Ynew = ((((MapSizeUE - 1) * Scale) / MapRangeY) * Lat) - Ym) * -1