Flight plan for a 3d model of a 15km x 10km site

I have to create a 3d model of an area in a city.  I have done individual sites by taking photos in a circle around the site and using CC' and a DSLR camera.  I usually shoot about 500 to 600 metres from the centre of the site and  this works well.  However the area that I am trying to model is about 15 km x 10 km and I would like fairly high resolution  Does any have a flight plan showing the photo locations for a project of this size.  A screen shot of the 3d view after AT is run would be ideal.  I will be shooting both obliques and nadir images but  I wanted to get a better idea of where and how many photos the acquire.  In know Bently has a model of the Orlando area;  the flight plan for this would be extremely helpful

Farouk Rohoman