Attached Link: http://www.debevec.org/HDRShop/tutorial/tutorial4.html

Now make sure you have HDRshop installed and follow the above tutorial. Convert this cross map to a latitude/longitude projection! TADA! Repeat as necessary. Caveat: I can;t test this last step because I use a mac and HDRshop does nor run on a mac. So i can only assume it works. hdrshop: http://www.debevec.org/HDRShop/