CC BY 4.0 · 2018-07-24
SGC · Cumbal volcanic hazard
Five official geometries clipped to the demonstration extent.
Open source ↗← Back to the MapGIS alternative
OPERATIONAL CASE · GEOHAZARD · CUMBAL
Volcanic hazard and buildings in Cumbal, in one view
This case combines three public sources to answer one question: which loaded buildings cartographically intersect each hazard level. It is reproducible screening, not an alert or an individual risk assessment.
This workflow demonstrates one GeoSAT OpenGIS capability. It does not prove universal equivalence with MapGIS or a specific installation: validation is performed workflow by workflow.
5
Hazard zones
SGC in the extent
450
Buildings
public IGAC sample
2
Movements
historical SGC inventory
433 / 17
Medium / low overlap
geometric classification
Verifiable snapshot · Retrieved 2026-07-17
What the loaded sample answers
The versioned snapshot contains five hazard zones, 450 buildings and two historical mass movements. The geometric overlay classifies 433 buildings in medium hazard and 17 in low hazard within the selected extent. The overlap can prioritize review; it does not establish vulnerability, risk, evacuation or structural condition.
GeoSAT OpenGIS
From official data to a verifiable query
The workflow preserves provenance and separates GeoSAT calculations from facts published by each authority.
- 01
Load allowlisted sources
The server queries only predefined SGC and IGAC services; the browser never supplies an upstream URL.
- 02
Normalize and bound
Geometry is clipped to the case extent, unnecessary identifiers are removed and the public response is capped at 500 features.
- 03
Overlay geometry
Building–hazard coincidence is calculated as a cartographic intersection and labelled as GeoSAT analysis, not an official SGC or IGAC attribute.
- 04
Inspect and export
Users can filter levels, select geometry, measure and export the selection with license, date and attribution.
Demonstrated in this viewer
- Combined hazard polygons, buildings and point events.
- Indicators recalculated from visible filters.
- Map and HTML-list inspection, measurement and GeoJSON export.
- Live or versioned fallback mode identified in the interface.
What this map cannot establish
- It is not an official alert, evacuation map or geotechnical study.
- Hazard is not risk: complete exposure, vulnerability and field validation are absent.
- Mass movements are historical records and do not describe current activity.
- The 450-building sample is bounded by the public demo response.
Sources, licenses and cutoffs
Every layer has an explicit origin, reuse license, data cutoff and attribution.
CC BY 4.0 · 2020-03-10
SGC · Mass-movement inventory
Two published historical events inside the loaded extent.
Open source ↗CC BY-SA 4.0 · 2026-01-31
IGAC · Public cadastral buildings
A bounded 450-building sample, normalized without unnecessary identifiers.
Open source ↗Questions about this case
Does the viewer show official volcanic risk for each building?
No. It shows cartographic coincidence between public layers. Risk assessment requires vulnerability, complete exposure, scenarios and competent validation.
What happens when an upstream source fails?
The interface identifies fallback mode and uses a versioned snapshot of the same sources. It does not replace Cumbal with another municipality.