Martin Jambon 🌍🌎🌏

@tim_fan I suppose we could compare the Delaunay triangulations in both coordinate spaces and flag neighborhoods that are not preserved by the mapping.

@tim_fan cool. I don't have any need for it but I'm curious about dealing with bad data in practice and in theory. I.e. if one point is inconsistent with the majority, there should be a way to detect it and flag it. In practice, I suppose it depends on the application (e.g. are coordinates entered by a human who can make typos?).

@verbeeld I'll investigate

@verbeeld I'll give it a try when I'm at my desk. I'm curious about how it works:

• the wiki aspect: how are plain mistakes and vandalism undone?
• the precision and distortion aspects: what's the algorithm to map user-entered geographic coordinates to image coordinates using reference points?

Palo Alto was founded in 1894. By 1926, the modern streets and schools were already there. https://here.allmaps.org/?url=https%3A%2F%2Fannotations.allmaps.org%2Fmaps%2F410aa7f618181e9b

Here's an early map of our area in 1866. Palo Alto didn't exist yet. https://here.allmaps.org/?url=https%3A%2F%2Fannotations.allmaps.org%2Fmaps%2Fac78651595c7cc97

@verbeeld here's my location. The authors of the map didn't specify a publication date but it's ok because it's "correct". https://here.allmaps.org/?url=https%3A%2F%2Fannotations.allmaps.org%2Fmaps%2F6fe39b2f7d71ae12