Aerial searches are not searches under the meaning of the Fourth Amendment to the Constitution of the United States as long as the police are in a lawful airspace because there is no reasonable expectation of privacy from being viewed from such places since anyone can fly a plane there.
Sense-enhancing technology constitutes a search under the Fourth Amendment if the technology is not generally available to the public and it reveals information that one would reasonably expect to be private.
According to Kyllo v. United States, taking a picture of the infrared light being emitted from someone's home is considered a search under the Fourth Amendment because it can reveal the heat being generated in various rooms of the house, which can reveal details about the interior of the home, which has the greatest expectation of privacy, and because when Kyllo v. United States was decided, infrared cameras were much more expensive than they are today.
Dogs can be used to search during a lawful traffic stop without it constituting a search under the Fourth Amendment to the Constitution of the United States because there is no reasonable expectation of privacy in the smells that one gives off.
Dogs being used within the curtilage of one's home is a search however because, even if though people generally have a license to enter premises for certain purposes like going up to the front door, bringing dogs to sniff is exceeding the police's license to enter and is therefore a trespass.