The key factors to consider with digital aerial photography are resolution and file size. It's similar to your decision to use 50K O/S or 25K O/S or even 10K paper maps. It's a trade off between detail and area covered. How much detail do you want or expect?
There are a lot of 3D products coming on the market now that use relatively low resolution data around the 4 metre pixel range (183kb in jpg format for a 1km square) which you may find adequate. Photoscape uses 2m pixels (732kb) which is 4 times greater resolution. Mistyhill Terravisual gives you the ultimate 0.5m pixel(11.4 MB) and the main data suppliers such as Getmapping provide the commercial market with 0.125 m for selected areas.
As one would expect, you get what you pay for.
Go check out the raw data costs and see what a great deal you're really getting from all of these products.
Posted: 05/09/2004 at 16:48