An interesting service out of Austin, TX. The company provides Georeferenced viewshed photography for preconstruction high rise condos. They target condo projects that need preconstruction spatial visibility analysis with engineering, design, marketing/sales and unit pricing based on the view (viewshed). From the company… “We have developed one-of-a-kind camera systems with precision aerial positioning capability to photograph from specific floors and windows. Specialties involve flight operations up to 1000′ AGL in extremely dense urban areas where helicopters can not be used. All of our equipment travels nationwide as checkable luggage with our team on all airlines.” See http://www.blimpphoto.com
