Build a CityJSON Urban Flood Inundation Assessor

Assess coastal and riverine flood vulnerabilities using CityJSON 3D terrain and building footprints. Identify ground-floor habitable spaces below projected sea level rises to plan flood defenses.

Urban Resilience and Infrastructure Planner

Load a municipal CityJSON model containing Building and WaterBody objects.

Parse geographicalExtent bounding boxes and base elevation coordinates.

Simulate projected water surge levels against building ground finished elevations.

Generate a structured vulnerability report identifying high-risk municipal assets.

Interactive floodplain map displaying water level contours, affected building polygons, and flood mitigation priority tables.

Download open CityJSON 2.0 city models from European municipal open geodata repositories. Starter examples below are synthetic. They are not downloaded records.

CityJSON Reads geographicalExtent [minx, miny, minz, maxx, maxy, maxz] and WaterBody city objects from CityJSON.

langgraph, fastapi, pydantic. LangGraph choreographs the multi-stage evaluation pipeline between elevation extraction, surge comparison, and risk ranking. General instruction API model to synthesize resilience recommendations from geospatial flood impact data.

Submit runnable source, pinned dependencies, setup commands, a working interface, example outputs, and a recorded end-to-end demo. Include tests and an action log.

Extracts minz ground elevation from CityJSON building bounding boxes.

Flags buildings where minz is lower than the projected surge height.

Outputs risk classifications based on flood inundation depth.

```json [ { "input": { "surge_scenario_name": "100-Year Surge Event", "projected_flood_elevation_m": 4.2, "building": { "id": "Docklands_Warehouse_04", "type": "Building", "geographicalExtent": [ 85200, 447100, 3.1, 85250, 447160, 15 ], "attributes": { "owner": "Port Authority", "occupancy": "Storage" } } }, "expected_output": { "building_id": "Docklands_Warehouse_04", "ground_elevation_m": 3.1, "flood_level_m": 4.2, "inundation_depth_m": 1.1, "risk_category": "CRITICAL", "mitigation_recommended": "Install deployable flood barriers and elevate ground-level electrical switchgear." } }, { "input": { "surge_scenario_name": "100-Year Surge Event", "projected_flood_elevation_m": 4.2, "building": { "id": "Upland_Apartments_12", "type": "Building", "geographicalExtent": [ 86000, 448000, 8.5, 86040, 448050, 24 ], "attributes": { "owner": "Civic Housing", "occupancy": "Residential" } } }, "expected_output": { "building_id": "Upland_Apartments_12", "ground_elevation_m": 8.5, "flood_level_m": 4.2, "inundation_depth_m": 0, "risk_category": "SAFE", "mitigation_recommended": "No structural floodproofing required." } } ] ```

Surge calculations represent macro-level planning simulations. Emergency flood management must follow official civic emergency protocols. Use mock external writes. Require human review before any real deployment.