This web-based app has not yet been written!
A browser-based implementation that includes some of the concepts from PhotoMap (photo to location-accurate map), described in the paper:
Johannes Schöning, Antonio Krüger, Keith Cheverst, Michael Rohs, Markus Löchtefeld, and Faisal Taher. 2009. PhotoMap: using spontaneously taken images of public maps for pedestrian navigation tasks on mobile devices. In Proceedings of the 11th International Conference on Human-Computer Interaction with Mobile Devices and Services (MobileHCI '09). Association for Computing Machinery, New York, NY, USA, Article 14, 1-10. https://doi.org/10.1145/1613858.1613876