The Layer Spy tool allows you to view an aerial photo background, in the shape of a circle, overlaid onto a regular street view map, as depicted in the following image.
You can use the Layer Spy tool to more clearly define boundaries, locate buildings, and clarify positions on the map. Activate Layer Spy by pressing the black-white circle on the toolbar. As of now, Layer Spy has a minimum visibility at a scale of 1:400. This is plenty close enough to identify houses, and smaller structures. Layer Spy is a ground-breaking feature by yey’maps which can enhance the way you can locate structures and other features without changing your background map.