An application that simulates shadows at a particular location. For real estate purposes, seeing what kind of sunshine you would get in your backyard when you purchase that house with a backyard in the north.
CoreLogic was doing something like this, but line of sight from a window and then be able to possibly identify the scene / view that can be had from that window.
The geometry is just the building footprint. You could probably do some sort of estimate as to how likely the yard was to have sun, but it wouldn't enable doing anything detailed.