Small Aircraft; Low Wing; 1 Eng; Retractable Gear
Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Commercial; Flight Crew Flight Instructor
Flight Crew Last 90 Days 117; Flight Crew Total 1934; Flight Crew Type 322
Physiological - Other; Situational Awareness; Confusion; Distraction
Deviation - Altitude Excursion From Assigned Altitude; Deviation - Track / Heading All Types; Inflight Event / Encounter CFTT / CFIT
Air Traffic Control Issued Advisory / Alert
Human Factors
After being vectored over the airport and sequenced behind multiple heavy jets; I was cleared for the visual approach to 35R at SDF. The last vector to final was a shallow intercept angle and I mistakenly identified a warehouse as being part of the [company] ramp. This led to partial spatial disorientation which allowed me to believe I was 1.5 miles from the airport instead of the actual 2.5 miles. The tower controller gave me an altitude alert and the altimeter setting; which prompted me to add power and reevaluate my location to the airport. I then reset my glide path and had a stabilized approach to landing with no further issues. I believe a contributing factor was the lengthy duty day that also included a stop at SDF about 10 hours earlier. Additionally;  I was vectored over the airport and looked down at the airport environment to identify the [company] ramps and the FBO ramp where I would be offloading/loading freight; which added to my belief that I had correctly identified part of the airport environment. To prevent this from happening; I could have switched my CDI to follow the ILS (which I had loaded). Also; since I was cleared for the visual I could have turned more to intercept final further out instead of following a shallow intercept angle.
Pilot reported losing spatial orientation which led the reporter to think they were closer to the airport than they actually were.