Slovakia: re-test the ZBGIS MapServer /query endpoint — it blocks every layer except mask and cover #226

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opened 2026-08-24 17:07:16 +00:00 by art-bot · 0 comments

art-bot commented

2026-08-24 17:07:16 +00:00

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Gated on #213. This is an investigation issue and a blocker for most of Slovakia, so it
is worth doing before any Slovak layer issue is picked up.

The situation

https://zbgis.skgeodesy.sk/zbgis/rest/services/ZBGIS/MapServer?f=json returns HTTP 200
with 92 layers, Query advertised, maxRecordCount = 1000. That 92-layer list is
Slovakia's R6 full published class list and it maps cleanly onto almost every ismap layer:
22 Cesta (with RTN route number, RDT, RST), 37 Železnica,
35 Vodný tok (NAM), 73 Vodná plocha (NAM), 10 Prameň,
19 Vodopád, 41 Budova, 62 Plocha letiska, 100 Štandardizovaný názov
(NAM + CAT).

But every …/MapServer/<id>/query?… call returned HTTP 503, twice, about twenty
minutes apart, serving the cadastre portal's Slovak load-shedding page ("if the system does
not respond immediately, it is due to a large number of queries").

Why this is not yet a verdict

Layer metadata returns 200 throughout, the host has an A record, and the box's missing
IPv6 route is not involved. This is the server shedding query load, not an unreachable
source — and per the Greece lesson, a source ruled out on a transport-layer symptom never
gets re-examined. So: re-test, at a different time of day, before anyone concludes anything.

What this issue should produce

A verdict on whether /query is reliably usable.
If it is: a note on the paging cost. At maxRecordCount = 1000, Cesta or
Budova nationally is tens of thousands of paged requests against an endpoint that is
already shedding. That is an import-design risk regardless of whether it works once.
If it is not: find ÚGKK's bulk-download route ("na stiahnutie" on geoportal.sk), or
fall back to CDB RoadLink (132 181 links, anonymous, but INSPIRE-stripped of
classes) plus a class join from somewhere else.
Either way, resolve where tram and station geometry live — neither appears in the
92, and Lanovka, vlek mixes cable cars with ski tows.

Gated on #213. This is an investigation issue and a **blocker for most of Slovakia**, so it is worth doing before any Slovak layer issue is picked up. ## The situation `https://zbgis.skgeodesy.sk/zbgis/rest/services/ZBGIS/MapServer?f=json` returns HTTP 200 with **92 layers**, `Query` advertised, `maxRecordCount = 1000`. That 92-layer list is Slovakia's R6 full published class list and it maps cleanly onto almost every ismap layer: 22 `Cesta` (with **`RTN`** route number, `RDT`, `RST`), 37 `Železnica`, 35 `Vodný tok` (**`NAM`**), 73 `Vodná plocha` (**`NAM`**), 10 `Prameň`, 19 `Vodopád`, 41 `Budova`, 62 `Plocha letiska`, 100 `Štandardizovaný názov` (**`NAM`** + **`CAT`**). **But every `…/MapServer/<id>/query?…` call returned HTTP 503**, twice, about twenty minutes apart, serving the cadastre portal's Slovak load-shedding page ("if the system does not respond immediately, it is due to a large number of queries"). ## Why this is not yet a verdict Layer *metadata* returns 200 throughout, the host has an A record, and the box's missing IPv6 route is not involved. This is the server shedding query load, not an unreachable source — and per the Greece lesson, a source ruled out on a transport-layer symptom never gets re-examined. So: re-test, at a different time of day, before anyone concludes anything. ## What this issue should produce 1. A verdict on whether `/query` is reliably usable. 2. If it is: a note on the **paging cost**. At `maxRecordCount = 1000`, `Cesta` or `Budova` nationally is tens of thousands of paged requests against an endpoint that is already shedding. That is an import-design risk regardless of whether it works once. 3. If it is not: find ÚGKK's bulk-download route ("na stiahnutie" on geoportal.sk), or fall back to **CDB `RoadLink`** (132 181 links, anonymous, but INSPIRE-stripped of classes) plus a class join from somewhere else. 4. Either way, resolve where **tram** and **station** geometry live — neither appears in the 92, and `Lanovka, vlek` mixes cable cars with ski tows.

art-bot self-assigned this

2026-08-24 17:07:16 +00:00

art-bot referenced this issue

2026-08-24 17:10:21 +00:00

Slovakia roads and railways: ZBGIS Cesta/Železnica, or CDB geometry with a class join #235

art-bot referenced this issue

2026-08-24 17:10:21 +00:00

Slovakia water, water_points and places: ZBGIS NAM/CAT behind the throttled endpoint #236

art-bot referenced this issue

2026-08-24 17:10:21 +00:00

Slovakia: buildings, airports, and the transit/stations/ferries questions #237

art-bot referenced this issue from a commit