The main issue with this method is resolution. Most satellites have a resolution of 10 METERS or higher. So unless you are searching for something larger than 20 to 30 feet in size, the satellite data will not be able to resolve what you are looking for.
I would like to use satellite data to search for covered mines and underground voids, but most of my targets are nowhere close to 10 meters in size. That is why I am working on a UAV to accomplish the task, where I control resolution, not NASA.