Web App

Simple Leaflet frontend for the Demscore MapServer WMS layer.

Features

• Select dataset (qog, repdem, v_dem)
• Select variable per dataset
• Select year and hex size
• Switch between multiple baselayers
• Overlay dynamic WMS hex layer from MapServer
• Read UI config from web-backend API endpoints
• Configure variable polarity (positive/negative) in config/variable_polarity.json (served through web-backend)

Polarity Configuration

config/variable_polarity.json is served by web-backend and controls whether higher values map to blue (positive) or red (negative).

• defaults.polarity: global fallback
• dataset_defaults: fallback per dataset
• variable_overrides: explicit per-major-variable settings
• rules (optional): regex-based overrides for variable ids

Backend API

• Webapp config is fetched from split endpoints on http://127.0.0.1:8091:
  • /api/config/variables
  • /api/config/legend-semantics
  • /api/config/variable-polarity
  • /api/config/variable-metadata/:dataset (lightweight summary, loaded on demand per dataset)
  • /api/config/variable-metadata/:dataset/:variable (full metadata, loaded only when opening Variable Information)
• Map tiles/imagery are still fetched directly from MapServer (:8088 or cached :8089).

URL

http://127.0.0.1:8090

Optional cached WMS mode

• Toggle cache in repo .env:
  • DEMSCORE_ENABLE_MAPCACHE=0 disables cache (default)
  • DEMSCORE_ENABLE_MAPCACHE=1 enables cache
• Start services for local dev: ./scripts/dev_up.sh
• Open app in cached mode: http://127.0.0.1:8090/?cache=1
• Override WMS base manually: ?wmsBase=http://127.0.0.1:8089/?map=/etc/mapserver/mapserver.map