Specifications include, but are not limited to: Two (2) multi-rotor aircraft meeting the following specifications. Sufficient payload to simultaneously carry any two of the sensors specified in item 2, and to carry two professional DSLR cameras (not included in this request). Redundant battery systems with minimum 24-minute flight time; three sets of batteries included. Batteries should be sized for commercial airline transport (under current regulations). Ability to safely land with single motor/rotor failure. Capability for two downward facing gimbals capable of independent control. Gimbals selectable for gyro, synchronized control or independent control with 360-degree in horizontal plane and 180 degrees in vertical plane or capability to simulate without changing platform flight direction. Two provided remotes/controllers; capability to control all gimbals from one or two remotes (selectable). Position and orientation system (POS) with GNSS antenna/receiver (with at least GPS L1/L2/L5 channels but GLONASS and Galileo channels also preferred) and inertial measurement unit. Real-time position accuracy with SPS service of better than 3 meters. Post-processed accuracy of 5cm. IMU roll and pitch accuracy (real-time and post-processed) 0.03 degrees, heading 0.3 degrees real-time and 0.08 post-processed). Post-processing software included. System should be capable of upgrade to RTK operation (but does not need to include base station and radio link).