The satellite images will invariably be a result of a satellite in a near circular polar orbit, and at such an angle that pictures of any location are always taken nearly at local noon. That way the shadows are smallest, and there is best detail. The satellite will be orbiting and scanning an area almost directly below it, any shadows will be on the pole side of the building, as it will be imaging a scan line from directly above. Errors will only occur for objects off to the side of the scanned track, which is typically a few kilometres wide, depending on the desired image resolution it can vary from only 100km wide to over 2000km with doing wide spectrum scans. The image is not a picture per se, just a series of scan lines, aligned to look like an image when properly aligned in software. No picture sensor there in most cases, you have either a scanning spinning mirror scanning the area onto a photodetector ( or a set of them) or a line scanner looking through a mask.