This is from my recent reply on captured data:
I recall reading a biography about General Patton who, while on training maneuvers, knew his opponents used official Army maps, dating from the Civil War. Patton gained a significant edge by using up-to-date maps, published by National Geographic.
After serving 12 years in elected office in Honolulu, I am aware that the most recent maps of a city are usually stored in two government offices: Dept of Planning & Permits, and the Dept of Taxation. They have detailed maps and data, from property altitude and dimensions, to the number of urinals in each men's lavatory at every shopping mall. All the data is public-access information.
Honolulu Tax key map of the Diamond Head Crater area: (The circled numbers refer to detailed maps)
If you are looking for VERY detailed maps of your local area, local government is a great place to start.