Ignore zero degree heading in XMP data since it's used as a placeholder by some cameras that don't have a magnetometer (e.g. Ricoh Theta).
Ignore zero degree heading in XMP data since it's used as a placeholder by some cameras that don't have a magnetometer (e.g. Ricoh Theta).

psteph801/psteph801.github.io,mpetroff/pannellum,psteph801/psteph801.github.io,psteph801/psteph801.github.io,psteph801/psteph801.github.io,mpetroff/pannellum,mpetroff/pannellum,mpetroff/pannellum