I bet noone checked the site with Google Maps and not one single NSA IT expert can write a software that uses the API of Google Maps to check every possible sniper or bomb position.
You have no 3D map created by e.g. open source software like Blender from neither Google Maps, sent by local law enforcement or created by Secret Service staff, and if the industry will ask for millions in Dollars, to enable the sniper team walking in a virtual map months before arriving there.
