Now I made a sequence of a windmill: http://www.mapillary.com/map/im/tE9rcfELY_CRMVZ0eRaaZA/photo
The windmill lies in an open field, I went in an almost perfect circle around it pointing the camera att the windmill. GPS track + heading are perfectly recorded.
But the 3D modelling process makes a mess of it anyway. @Peter is there a way to help the 3D modelling proces in these cases? It would be nice if you could tell it the headings are correct (+/- 10 degrees)