Document EA hydrology live demo verification

Author: Sam-Bolling

docs/research/new-publisher-source-planning/Environment_Agency_Hydrology_Live_Demo_Verification_2026-05-26.md

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+# Environment Agency Hydrology Live Demo Verification
+
+Date: 2026-05-26
+
+## Purpose
+
+Verify that the Environment Agency Hydrology publisher and Explorer UI updates are visible in the production CSAPI Explorer live demo experience.
+
+## Deployment State
+
+Explorer repository:
+
+```text
+OS4CSAPI/ogc-csapi-explorer main
+8712d11 Show hydrology latest readings on map cards
+```
+
+Publisher/documentation repository:
+
+```text
+OS4CSAPI/OSHConnect-Python main
+a6acc37 Add Environment Agency hydrology publisher
+```
+
+The production Pages route served a new built JavaScript asset:
+
+```text
+https://ogc-csapi-explorer.pages.dev/assets/index-BWlscW-4.js
+```
+
+The production asset contains the expected update strings:
+
+- `Latest readings`
+- `Groundwater level`
+- `popup-latest-readings`
+- `environment agency`
+- `SFGPEWRH-------`
+
+## Correct Live Demo Preset
+
+The Environment Agency Hydrology resources are on the Explorer preset:
+
+```text
+OSH (OS4CSAPI)
+https://129-80-248-53.sslip.io/sensorhub/api
+```
+
+They are not on the default `CSAPI-Go v2` preset:
+
+```text
+https://129-80-248-53.sslip.io/csapi-go-v2/
+```
+
+This distinction matters for live-demo validation. A user connected to `CSAPI-Go v2` will not see the Environment Agency Hydrology stations even though the live Explorer bundle is updated.
+
+## Backend Observation Check
+
+The live OSH backend returned latest observations for the curated Environment Agency datastreams:
+
+| Datastream | Reading |
+| --- | --- |
+| `05ig` | River flow `0.219 m3/s`, `Unchecked`, phenomenon time `2026-05-26T08:30:00Z` |
+| `05i0` | River level `0.181 m`, `Unchecked`, phenomenon time `2026-05-26T08:45:00Z` |
+| `05j0` | Rainfall `0.0 mm`, `Unchecked`, phenomenon time `2026-05-26T08:45:00Z` |
+| `05jg` | Groundwater level `53.8 mAOD`, `Unchecked`, stale phenomenon time `2026-04-20T07:00:00Z` |
+| `05k0` | River flow `0.291 m3/s`, `Unchecked`, phenomenon time `2026-05-26T08:45:00Z` |
+
+## Production Browser Verification
+
+Production URL:
+
+```text
+https://ogc-csapi-explorer.pages.dev/map
+```
+
+Connection preset:
+
+```text
+OSH (OS4CSAPI)
+```
+
+Map load result:
+
+```text
+605+ FEATURES
+```
+
+Selected deployment:
+
+```text
+EA Hydrology Beggearn Huish
+```
+
+Verified UI behavior:
+
+- The deployed-system card renders an image-backed STANAG symbol element instead of the old blank fallback rectangle.
+- The card includes a `Latest readings` section.
+- The card shows both Beggearn Huish readings:
+  - River flow `0.219 m3/s`
+  - River level `0.181 m`
+- The card shows relative source observation age and quality:
+  - `1h ago`
+  - `recent`
+  - `Unchecked`
+- The map popup DOM includes `.popup-latest-readings` and compact rows:
+  - River flow `0.219 m3/s`
+  - River level `0.181 m`
+  - `Latest 1h ago · Unchecked`
+
+The browser viewport available during verification was narrow/mobile-sized, so the popup element existed in the DOM while the deployed-system detail sheet was the visible primary interaction surface. The popup latest-reading content was still present and populated.
+
+## Remaining Warnings
+
+The OSH endpoint still returns multiple HTTP 400 responses for some relationship-query paths during map loading. The Explorer recovers enough to load the map and render the Environment Agency station card. These warnings are consistent with earlier Explorer/server compatibility notes and did not block live-demo validation.
+
+## Outcome
+
+Live demo verification passed for Environment Agency Hydrology on the `OSH (OS4CSAPI)` preset.
+
+Confirmed live-demo features:
+
+- production bundle updated,
+- correct OSH preset connected,
+- EA hydrology resources visible on map,
+- STANAG symbol no longer blank fallback,
+- deployed-system side card latest readings visible,
+- map popup latest-reading content populated,
+- backend latest observations available.