Can I tell the voltage of High Power Transmission lines by its Type?
You can determine the voltage imposed on the wires.  This is done by looking at the insulators holding the wires off the tower.  The more discs, the higher the voltage.  Those look like pretty high voltage, for long distance distribution.

However, voltage has nothing to do with the electromagnetic fields.  That is determined by the current in the wires.  That's not so easy to determine.

However, since you are interested in the electromagnetic fields at your location, the power company has an EMF meter they use to measure such a thing.  I don't know the arrangements for this, but call them and ask.  They came out and did a survey at my house when I sold it, so I know the service is available.  I don't recall having to pay for it.