Part 107 UAS pilot reported accidentally flying in controlled airspace without authorization. The pilot discovered the airspace violation after the flight.

Narrative

1. What happened?While flying my drone (UAS) for a commercial mapping mission on Day 0; I inadvertently launched in Class D airspace near ZZZ. I did not have a LAANC authorization at the time of the flight. I became aware of the violation after the flight when I checked my airspace map/app more carefully and realized the location was within an actively controlled airspace boundary.2. Why did it happen?This occurred due to human factors on my part when planning a multi-site mission. I had previously reviewed the area using Aloft; but I had mistakenly confused this site with a separate site that was just outside of the ZZZ Class D Airspace. It was not my intention to violate any FAA rules; and I was unaware of the airspace classification at the time of launch.3. What actions did you take?Once I realized the airspace violation at the next site which I had confused the airspace with; I immediately researched the previous flight area and mission. Upon realizing my failure; I informed myself on the necessary means to self-report; along with a performing post-incident review of my actions and the preceding conditions. I am now filing this report in an effort to take full responsibility and contribute to overall safety awareness.4. What could have prevented this?A more thorough pre-flight planning system and check list would have prevented this incident. This was an error of organization and pre-flight double checking.5. What will you do differently in the future?I am implementing a system to identify and write down site-specific issues for flight missions prior to flight. In addition; I am committing to complete my pre-flight checklist that includes confirming airspace with FAA-authorized LAANC apps and reviewing airspace class boundaries before each flight. I also intend to keep updated on UAS regulations regularly.