Place nodes missing if there is nearby place node with identical name

[Timmy-Tesseract]

Describe the issue OM appears to filter out certain place nodes during map generation if there is a nearby place node with identical name. Affected place nodes will not be rendered and will not show up in search results. This happens despite place nodes having a number of attributes clearly marking them as distinct entities, in some cases even if value of place tag is different.

Example 1 2x place=village distance between place nodes 2.1 km located in different admin_level=6 entities https://www.openstreetmap.org/node/6917101102 (exists in OM) https://www.openstreetmap.org/node/6910742180 (missing in OM)

Example 2 place=village and place=hamlet distance between place nodes 848 m located in different admin_level=4 entities https://www.openstreetmap.org/node/5249604308 (exists in OM) https://www.openstreetmap.org/node/6787296079 (missing in OM)

Example 3 2x place village distance between place nodes 2.4 km located in different admin_level=3 entities https://www.openstreetmap.org/node/4462800161 (exists in OM) https://www.openstreetmap.org/node/8791290763 (missing in OM)

Limits to reproducibility

• Issue only seems to occur if proximity is under a certain threshold. For above mentioned example 1 there is a third village with identical name 17 km away which is not ommited in OM.
• Issue appears to not affect all close proximity place nodes with identical names. In OM screenshot for example 1 there are 2 place=neighbourhood with name "Purok 4" displayed correctly despite distance of only 820 m which is less than the missing place nodes in all three examples.

[biodranik]

@Timmy-Tesseract what does it mean physically, two different villages with the same name?

[Timmy-Tesseract]

Yes there are two distinct settlements both with their own government offices, schools, health facilities, etc.

Historical background is usually that a sparsely populated area was already named before administrative boundaries were delineated. Then once territorry was divided by a municipal boundary both municipalities established their own village using the already existing name.

[pastk]

FYI @vng

[vng]

Yes, we do filter similar neighbor OSM places because of often mapping duplicates (Node, Way, Relation, and sometimes several of them) that logically define one place.

What can we do here? Probably enhance the similarity heuristic or add exceptions somehow ..

See generator/place_processor.cpp, the logic is very heuristic there :)

[biodranik]

@vng is it possible to generate a dump of all such close, filtered features from our generator, to manually take a look on them, and maybe add exceptions based on their ids?

[muralito]

Example 3 2x place village distance between place nodes 2.4 km located in different admin_level=3 entities https://www.openstreetmap.org/node/4462800161 (exists in OM) https://www.openstreetmap.org/node/8791290763 (missing in OM)

This two nodes has different value in tag is_in:municipality. This data could be used to feed the heuristic, and also to display it in the text list result, so the user can differentiate between them.