Duplicated addresses in Trinidad & Tobago

Hello everybody,

I was looking at duplicated notes and came across some in Trinidad. That’s how I noticed that there are an unbelievable number of duplicated address nodes over the whole country. Zoom in at any place and you will see the housenumbers in multiples.

For example, the same housenumber 109 has been added at least seven times with two changesets:
Changeset: 8456180 | OpenStreetMap
Changeset: 8457691 | OpenStreetMap
These imports seem to have all been done by @pdunn who last edited 4 years ago

All of the import changesets that I could find, in chronological order (it’s very possible that I have missed some):
Changeset: 8390578 | OpenStreetMap
Changeset: 8393223 | OpenStreetMap
Changeset: 8393233 | OpenStreetMap
Changeset: 8393357 | OpenStreetMap
Changeset: 8393538 | OpenStreetMap
Changeset: 8393554 | OpenStreetMap
Changeset: 8393556 | OpenStreetMap
Changeset: 8393560 | OpenStreetMap
Changeset: 8393562 | OpenStreetMap
Changeset: 8393673 | OpenStreetMap
Changeset: 8393676 | OpenStreetMap
Changeset: 8393678 | OpenStreetMap
Changeset: 8393685 | OpenStreetMap
Changeset: 8393690 | OpenStreetMap

Changeset: 8456163 | OpenStreetMap
Changeset: 8456170 | OpenStreetMap
Changeset: 8456180 | OpenStreetMap
Changeset: 8456184 | OpenStreetMap
Changeset: 8456193 | OpenStreetMap
Changeset: 8456199 | OpenStreetMap
Changeset: 8456204 | OpenStreetMap
Changeset: 8456210 | OpenStreetMap
Changeset: 8456220 | OpenStreetMap
Changeset: 8456238 | OpenStreetMap
Changeset: 8456259 | OpenStreetMap
Changeset: 8456295 | OpenStreetMap
Changeset: 8456330 | OpenStreetMap
Changeset: 8457514 | OpenStreetMap
Changeset: 8457521 | OpenStreetMap
Changeset: 8457524 | OpenStreetMap
Changeset: 8457536 | OpenStreetMap
Changeset: 8457547 | OpenStreetMap
Changeset: 8457602 | OpenStreetMap
Changeset: 8457633 | OpenStreetMap
Changeset: 8457691 | OpenStreetMap

It looks like the changes were done in only 3 days in June 2011 with a few days of break in between. The first changeset alone has 24947 nodes :dizzy_face:

There are no sources given for the address data.

What should we do with all of that?

Is there a real mapping community in Trinidad and Tobago?
It does not look like there are many active mappers there: OsmStats for Trinidad and Tobago

In my opinion, the multi-plicates are at least very annoying. I don’t know if the addresses are even accurate enough to be of some use for navigation.
Would removing all of them be worse than the current situation, given that nobody seems to be on the ground to add new address data? Could we merge duplicates in an automated way? (probably not a good idea!)

Seeing this area Node History: 1327467563 | OpenStreetMap I really think removing all of that data would make the map better. There are at least nine nodes with addr:housenumber=14 in that 20m radius, but they have different street names and even different city names. In addition, there are about 30 nodes in the same view with different addr:city and addr:street names that don’t have a addr:housenumber :scream:

Of course, it’s also very possible that the data is not compatible with our licence – but how could one find out after so many years? There does not seem to be anything about the imports on the wiki.

Reverting the changes would be a challenge. Most of the nodes have been changed at least once by xybot, or some other mechanical edits. Some seem to have been fixed by locals. Is there a tool that lets you revert all nodes that have only been changed by certain users or changesets?

(PS) I did send a message to pdunn asking them to join, hoping they still can read their OSM emails.

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Ce sujet de discussion accompagne la publication sur https://community.openstreetmap.org/t/duplicated-addresses-in-trinidad-tobago/100763