Looking down from above in 2D has opened the way to rooftops &...

Looking down from above in 2D has opened the way to rooftops & ground & the people who need only this perspective have found this more than sufficient todays Solar has been on top of rooftops. Tomorrow's solar with the use of nono technology thats basically see through where solar panals will be built into glass windows on high rise buildings, Making this 3D technology a breeze to quote on a job. Just being able to view horizontals on any structure or cliff all adds value. Whatever you can think of thats vertical on buildings, bridges, Building dams, flood plains for new housing developments. Gaming is where I think nearmap would make an absolute fortune. Digitising Earth in a time machine of then & now. In 100 years will people be doing VR tours of what Sydney looked like in the year 2017
You cannot measure vertical string from above. it just looks as like a dot.
Just knowing how long that string is, is basically answering how long is a peice of string. With the applications of vertical measurement opens up a whole lot more uses like Forrest plantations could use it to track growth of trees. To finally knowing what side of your bread is buttered if it where horizontal.