This DIY USB trigger allows you to control a Canon Point and Shoot camera for performing aerial mapping missions. This video shows you how to build a USB trigger cable that connects your RC receiver to your Canon P&S camera. With this set up you can utilize the remote trigger function in CHDK controlled by a switch on your RC transmitter.
Take individual pictures at specific locations or at set intervals to cover a large area with overlapping images that can be used to create orthorectified imagery and even Digital Surface Models (DSM).
The total cost of parts for this project is less than $20 and you can complete it in less than an hour. You’ll need an Eflight EFLA600, a USB cable, some electrical tape and heat shrink, and it’s best if you can solder the necessary connections.