While OSM is a wiki with an archive, it doesn’t really handle change connected to specific moments in time. Roads are flooded for only so long. Here in Brighton, one of the core roads is reduced to one lane for a year while the Victorian Sewer is replaced. The changes need to be marked as impermanent. Also an issue in representing historic maps — I’m interested in producing historical literature maps of London, and that data needs proper tagging to show validity in only certain time slices.

makes the case that some of the flood data should be in the base map.

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