CashlessConsumer/chennaidss-gis-layers

UngalSoththu release — an AI-native transit & public-assets desk run on Zo Computer · ungalsoththu.github.io. Not a CashlessConsumer project.

Chennai Flood DSS — GIS layers pack (GeoParquet), 2026-09-29

181 GeoParquet layers extracted from the Chennai Flood Monitoring & Decision Support System (CFM-DSS) GeoServer at chennaifloodmonitor.tn.gov.in (WFS 2.0, public endpoint) on 2026-09-29.

Source namespace: ChennaiDSS. Original format: GeoJSON (EPSG:4326). This pack preserves original geometry and properties; one .parquet per layer, grouped in category folders (boundaries, drainage, flood_history, forecasts, misc, stations, wards_crowd_alerts, water).

Provenance

• Pulled via WFS GetFeature with pagination (count=10000&startIndex=); per-layer feature counts verified against the server capabilities census (344 layers; 343 readable).
• The Dec-2023 Cyclone Michaung-era archive (287 layers) is on Hugging Face as CashlessConsumer/chennai-rain-gauges (GeoJSON, as-scraped).
• Layer catalog diff (2023 archive vs 2026 live): layer_diff.json.

Known gaps

• 5 layers failed at source during the 2026-09-29 pull (server returned OWS exception XML): keylocations_bulletin, keylocations_obsbulletin, keylocations_districtmap, ecmwf_control_ensemble, dgps_cfms.
• aws_new errors server-side (census). giswardmesh returns 0 features.
• Model-forecast ensembles reflect the last published run (Dec 2025); they are overwritten per run, not versioned, by the system.

Privacy

Crowdsourced flood reports (crowdsourced) are limited to public report content (level, note, timestamp, location); submitter usernames and photo filenames are removed. No other layer contains personal data. Station registries in the transactions dataset (companion repo chennai-flood-monitor-transactions) have officer/SIM/mobile columns dropped.

Use

Read with DuckDB: SELECT * FROM 'wards_crowd_alerts/ward_waterdepth_minmax.parquet'; or GeoPandas: gpd.read_parquet('flood_history/nrsc_flood_extent_2015.parquet').

Collected for research, journalism, and public-interest analysis (CashlessConsumer / UngalSoththu). Not affiliated with TNSMART/TN-DSS or the Government of Tamil Nadu.