HellMap
Not really about this issue, but speaking in general. Mapillary is cool to check one or two things, but it's really annoying to actually do a detailed mapping for a place with no features like this one. Mainly it's very and clunky and slow to forward and rewind, which is how I mostly survey with video. It's great once you map everything from a video and later want to check something and don't have the video anymore. But the first mapping pass... I tried it and it's just not fun for me.