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d4b1d73338
The flip was my mistake. Measured against the service instead of guessed: fetching a box and its northern half shows the half matching the top of the whole, so the images arrive with their first row at the north edge and the default texture coordinates were right all along. Both the base map and the orthophoto go back to them. Imagery of a given piece of ground does not change, so a fetched tile is now kept under editor/cache/orto and the next session starts from it. Until now the cache lived only in memory, which meant going back to a slow and flaky service for ground that had already been fetched once. Gaps can be fitted with a basket curve as well: the library's compound mode, with clothoids at both ends and a chain of arcs between them. Arcs can be added and removed; the closing one takes whatever deflection the earlier ones leave, so its length is not offered for editing.