Tagged parts of POI's way are mistakenly marked as separate POIs

[nachanon]

While I was checking for nearby local libraries in OpenPoiMap, I encountered an oddity on how it treated specially-tagged node which is a part of "way"-type POI. Namely, if the "way" matches the current POI search criteria, each of these specially-tagged nodes would also sprang up as duplicate POIs, depsite the fact that these nodes' tags are not matching current POI criteria by themselves. Non-tagged nodes of the way seems not to be affected by this problem.

Exact steps to reproduce:

• Start a web browser with JavaScript enabled.
• Go to OpenPoiMap home page.
• Go to latitude 13.77206 longitude 100.50475 on zoom level 17.
• You would see that near center of the map will be a place with book icon labeled "หอสมุดแห่งชาติ". (Screenshot)
• Enable "Amenity" on the left toolbar.
• Check "Library" overlay checkbox on the right panel.
• You would see that instead of the expected single POI marker, three of them shown up. (Screenshot below)

The actual POI in question is "หอสมุดแห่งชาติ" ("National Library") of type "way", marked with amenity=library tag, which is rightly flagged by OpenPoiMap. But the rest two are incorrectly flagged: these are "nodes" (1) (2) marked solely with barrier=gate tag; which are entrance gates to the library ground. Clicking these incorrectly-marked nodes will make the main "way" show its information dialog (screenshot).

For the record: At the time of writing, the latest change to the affected "nodes" is changeset 53062603, and latest change for the main "way" is changeset 54263885; both are authored by me through OpenStreetMap.org's online Potlatch2 editor.

Browser: Pale Moon 25.8.1 (GNU/Linux) OpenPoiMap: 1.28 (openpoimap.org)

[marczoutendijk]

Dear Nutchanon,

You wrote:

While I was checking for nearby local libraries in OpenPoiMap, I encountered an oddity on how it treated specially-tagged node which is a part of "way"-type POI. Namely, if the "way" matches the current POI search criteria, each of these specially-tagged nodes would also sprang up as duplicate POIs, depsite the fact that these nodes' tags are not matching current POI criteria by themselves. Non-tagged nodes of the way seems not to be affected by this problem.

That behaviour is known and specifically mentioned in the wilk (accessible with the question mark in after the title):

https://wiki.openstreetmap.org/wiki/OpenPoiMap#Quirks_and_remarks

It is the result of the library that is used to put markers that belong to buildings inside the building (and not somewhere outside those buildings), but the side effect is what you just noticed.

We are waiting for someone to fix that library…

Thanks for using OpenPoiMap!

kind regards,

Marc Zoutendijk.