One important part of survey aircraft selection is influenced by the system being installed. One company is limited to below 125kts for 90% of their survey work. That speed restriction is due to Lidar system requirements which all boil back to accuracy and content of data. PN68 seems to be ideal due to it's size/endurance/speed range. Next to zero ventilation makes it hard work though in summer!
Tecnam has the MMA. Not enough useful load or size in my opinion to fit in a lot of the survey systems out there + an operator + have mission endurance. Especially if you are off on tours for days/weeks.
http://www.f-air.cz/data/mma/tecnam_mma_folder.pdf
Looks neat though!