The app launching today is a fairly simple affair. You fire it up, give it a few bits of information about your home and then begin scanning each room. You’re given the option to do a single or to zap the whole house at once and you’re turned loose to shoot what is essentially a series of panoramic shots of a room from the inside, culminating with a spin in the center.
Those shots are then uploaded to the InsideMaps cloud for some special sauce application. That consists of utilizing data captured by the gyroscope and magnetometer inside your device (which is why they have to be fairly new smartphones) to craft a model.
That model is then checked against a series of visual touchstones in the images. The heights of doorknobs, window sills, etc. While they do this, they’re also gathering data about the average sizes of openings like doors and more, so they can apply machine learning to improve the quality of the models down the road.” via TechCrunch