Changelog fragment for #1642

changelog.d/1642-transit-floor-per-point.md

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+- Keep buses and trains off rooftops and out of bridge decks on the photoreal
+  3D tiles: the ground floor probes the rendered mesh where each vehicle is,
+  keeps each reading at the point it was taken (up to sixteen a cell) and
+  answers from the reading nearest the vehicle, instead of one probe at each
+  110 m cell's centre that lifted every vehicle in the cell onto whatever lay
+  there. Transit probes each vehicle's latest point, and grounded flights read
+  the floor at their own position (Sameh Khamis, @samehkhamis, #1642).