Great work but if you have a drone there is a better software to use. Even the Photoshop can stitch photos pretty well. If you are looking for a top class software for stitching (even a 360×180° panorama - sphere) you will need to go for PtGui. There is nothing better on the market right now.

I wish I had a drone too haha but the policy here to take photo with one is really bad :(