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face tracking uses the image itself.. Tello doesn't provide anything about the image processing.So I get the point of the GPS inaccuracy. But for the "follow a face" that you implemented you use the images itself or is the face detection provided by tello itself?
Also for SLAM you will need some image processing aswell.
The image features I think are provided by librarys such as openCV I believe.
As I specified in S/W license of application history, I used Google mobile vision library for face tracking.