Introduction

Welcome to The #questionable-edits OSM Iceberg!

Over the past 5 months I have been collating some of the strangest, funniest and most excruciating examples of vandalism, mistakes and creative mapping. This Iceberg takes its name from the #questionable-edits channel on the OSM World Discord where we share the weird, wild and wonderful things we’ve seen while mapping. It should be made clear, the intent of #questionable-edits (and my Iceberg) is not to mock, demean or dissuade novice mappers, but to educate about common mapping pitfalls and share some of the entertaining things that have been found. I myself am guilty of a number of things listed below! I’ve included over 80 items in my Iceberg, ranging from the well-known to the downright unhinged. This Iceberg is also available on the OSM forums.

It shouldn’t have to be said, but please do not harass or otherwise antagonise any users whose edits may be visible in these examples. The screenshots and changesets linked below are intended as illustrative examples, and aren’t intended to target individual mappers.

Happy April Fools everybody! (Yes I might be a day late, but I was last year too). Enjoy!

The Iceberg

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A collection/showcase of the different buildings and areas that I have mapped in 3D (through much trial and error). Each location has a link to view on OSM where you can see what building parts and tagging I’ve used to represent these buildings. The heights I have tagged on building parts are mainly calculated by working out the ratio of a building’s height and width in a photo (I used paint.net to measure these dimensions in pixels) and applying this to the width that can be measured from aerial imagery.

Automobile Club de Monaco Pavilion, Monaco 🇲🇨

Mapped 8 June 2026 - location on ohm.org / view in 3D This is the ACM pavilion, a temporary structure set up for the duration of the Monaco Grand Prix, so it had to be my first foray into 3D mapping in OpenHistoricalMap.

Binley Mega Chippy, Coventry 🇬🇧

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