Hover over the Marker Dots to see information about the buildings in the picture.
You can use toolbar, mouse and keyboard commands.
On the toolbar below the picture
With your mouse you can click to zoom and drag the image around.
With your computer keyboard: once you have clicked the image you can use the following commands (CAPS Lock should be off)
'a' = Zoom In,
'z' = Zoom Out
'x' = Turn Marker Dots On and Off