If you wish to measure a facing direction of a door, stand on the inside looking outwards using your compass.

Do not be confused between ‘location’ of the door and the ‘direction’ of the door. These are actually very different aspects.

For example:
A door can be located in North and face West.

Or a door can be located at the North and faces North.

Here is a door located in the South East sector, facing South.

Here is a door that is located at the West, facing South.

So, you can have a door in the South sector of your home but have it facing Southeast.