Measure area of a polygon on OpenStreetMap

Question

How can we measure the area of a polygon on a OpenStreetMap map?

It can be either:

It seems the standard OpenStreetMap viewer doesn't has this feature in the toolbar.

This is similar to Adding a ruler to the OpenStreetMap site? but about areas instead of distances.

Example @Taras, the surface area at ground level of this random building: openstreetmap.org/way/54989463 — Basj, Commented May 17 at 11:45
You need to be very careful doing any distance measurements with data displayed in Web Mercator (EPSG:3857) or WGS84 (EPSG:4326)., since neither is suitable to Cartersian measurement. — Vince, Commented May 17 at 11:46
@Vince I'm looking for areas if < 1000 square meter, so the differences will probably be negligible. — Basj, Commented May 17 at 11:50
Unless you plan to map the Equator, the differences will NOT be "negligible" -- 3857 error approaches infinity near the poles. — Vince, Commented May 17 at 13:25

Mapperz · Accepted Answer · 2024-05-17 12:31:17Z

1

There are a few websites that do this

This site does use ads to generate revenue to pay for the servers.

answered May 17 at 12:31

Mapperz♦

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Thanks ! But I see two problems in the UI/UX: 1) you can't zoom on a building, the maximum zoom level is not enough (I think this is already present on OSM) 2) you cannot pan / move on the map, but only zoom. Would you do another website that does not suffer from this problem ?
– Basj
Commented May 17 at 12:42
use the control on the left side to pan and zoom in out. The satellite basemap has more zoom levels.
– Mapperz ♦
Commented May 17 at 12:47

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