I am pretty sure it can, just depends on the lens that you use. It is not hard to calculate that yourself with some basic math. You know how many pixels you have in vertical and horizontal (size of the sensor), height of the flight and the lens FOV angle. Having this data you can calculate the GSD.
CHDK is only used for Canon, for A6000 you can trigger through multiport. Use a cable like this. You can make a trigger cable to Reach or to your autopilot from it. You will also need a hotshoe cable as shown here.