Hi, lot of interesting ...

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Hi, lot of interesting answers. Yes, you can use thermal imaging, I was recently and INTERGEO 2019 and saw really impressive drones with long flying time which is necessarily to cover large areas.

However, my suggestion is to start simple and slowly build complexity - and that is to use available satellite images that are free.

Landsat 8 has thermal band with resolution of 90 meters and its revisit time is 16 days. Sentinel 2 A and B have 10 meters resolution, no thermal band, but more other spectral bands and 5 days revisit time. Images are free to use.

If you want to learn how to get those images and learn how to use them here is the online course

https://groundwater-modeling.teachable.com/p/remote-sensing-basics-with-application-to-water-resources-geology