/// <summary>
/// Specify alternate zone number.
/// </summary>
/// <param name="zone">zone number for the alternate representation.</param>
/// <remarks>
/// See <see cref="ZoneSpec"/> for more information on the interpretation of zone.
/// Note that <paramref name="zone"/> == <see cref="ZoneSpec.Standard"/> (the default) use the standard UPS or UTM zone,
/// <see cref="ZoneSpec.Match"/> does nothing retaining the existing alternate representation.
/// Before this is called the alternate zone is the input zone.
/// </remarks>
public void SetAltZone(int zone = (int)ZoneSpec.Standard)
{
if (zone == (int)ZoneSpec.Match)
{
return;
}
zone = UTMUPS.StandardZone(_lat, _long, zone);
if (zone == _zone)
{
CopyToAlt();
}
else
{
(_alt_zone, _, _alt_easting, _alt_northing) = UTMUPS.Forward(_lat, _long, out _alt_gamma, out _alt_k, zone);
}
}
