OSM coverage gaps over time

How many City of Guelph street and park trees still have no OpenStreetMap tree beside them, and how many matched OSM trees still lack a species or a girth — one point per weekly comparison, so a mapper can see the worklist shrink.

1 comparisons since 2026-10-09 · last 2026-10-09 · current gaps · data (JSONL)

The chart counts trees; the cell counts (empty and thin squares) are in the table below. Points in the shaded span are reconstructed after the fact from OSM's own history (an Overpass attic query for that date, compared against today's City trees); the rest were observed by the weekly build. Counts follow the City's Trees layer, so they move when the City plants, removes or re-measures trees, not only when someone maps one.

Every comparison

Date	Empty cells	Thin cells	Missing	No species	No girth	Matched	City trees	OSM trees	Source
2026-10-09	452	159	34,523	8,032	8,095	8,189	42,712	53,997	live

Built by guelph-maps/guelph-trees-layer. OSM data © OpenStreetMap contributors. Contains information licensed under the Open Government Licence – City of Guelph.