As far as I know, the frequency of satellite Map updates is not very high, about every six months or a year, although the frequency of updates has little impact on our daily use. But in some extreme situations, such as floods, earthquakes, and other natural disasters, these commercial mapping services are useless.
I think the gas detection module combined with unmanned aerial vehicles can be used to detect high-risk areas and transmit real-time images in real-time. I'm going to try to build a homemade probe drone. I saw a gas detector G2 on BBS. I was wondering if anyone has tried this before?