This property gives information on the position component of orientation of the Photograph's Camera Station (i.e. the position of the perspective center of the camera at the time the photo was taken).
When this property is expanded (i.e. by clicking the small + next to the property title), the position is given in the x,y,z coordinate system of the project. Note these orientation numbers are in the rotated coordinate system as defined by Scale/Rotate. Also see Orientation.
You can also see the scaled and rotated Camera Station information in the Photo Table.