So in TX if your flying lets say in a public park and you fly over some farmland or a neighborhood that's over a treeline while your recording, you've broken the law??
I did download the app and it is a big help with knowing whether or not you are too close to an active airfield. It is illegal to fly withing 5 miles without notifying them, usually a simple phone call will cover your butt.
My house is about 3 miles from an active field....I normally use the app to drive out of the range and keep it under 400'. As far as the farmland or neighbor hood you will need to look at the regulations.
Know Before You Fly