Interesting project and implementation. It seems you did focus on a post-processing technique to control the validity of a volunteer contribution. I suggest that you also consider UX/UI techniques so as to guide the volunteer to be in the best conditions for capturing a high quality measurement (e.g. at least display your checklist on the screen at the right moment during the interaction process). Also, as an example, you may better show to the user that the current position is not accurate. You may also consider a too high speed to reject the measure. There are probably many techniques that would be relevant in your case. User engagement is related to interface design quality. It is a challenge that has been presented by Jens Ingensand during the OGRS216, "Keys to successful scientific VGI projects".
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