Hey guys, I am pretty sure that these maps are going to be very interesting for you!
HDRI gurus at http://www.mi360.de/en/home_en.html gave me fantastic opportunity to test and review their HDRI envs and backplates. For a long time, I've been looking for aerial envs and Norse/Iceland-ish type of maps for my book https://www.facebook.com/MachinesOfAdventure. And they surely do have some great ones! Not free, but worth of every pence.
(http://www.horseville.net/resources/mi360-hdri-testing.1251.jpg)
(http://www.horseville.net/resources/mi360-hdri-testing.1254.jpg)
(http://www.horseville.net/resources/mi360-hdri-testing.1257.jpg)
Story: https://www.facebook.com/MachinesOfAdventure
Looks like you had fun too :P I especially like the ariel view
Martin