Data sources

Everything on the map is traceable to the publishers below. The monitor shows model output and volunteered geographic data — it carries no official flood warning data. For official advisories, always consult PAGASA.

Open-Meteo Forecast API

Best-match numerical weather-model output from national weather services. Drives the model rainfall, temperature, wind, and humidity readings.

Documentation: https://open-meteo.com/en/docs
Endpoint: https://api.open-meteo.com/v1/forecast

DOST-PAGASA Automated Rain Gauges

Station-specific hourly rain-gauge observations published by PAGASA. Shown as the official PAGASA rain-gauge observation.

Published at: https://bagong.pagasa.dost.gov.ph/automated-rain-gauge

Philippine Statistics Authority PSGC

Official names and codes for Albay's cities, municipalities, and barangays.

Snapshot: 2023-10-24
Coverage re-verified: 2026-06-30
Reference: https://psa.gov.ph/classification/psgc/citimuni/0500500000

NAMRIA-derived administrative boundaries

Boundary polygons used to scope rainfall coverage to the selected area.

Snapshot: 2023-11-06
Release: v2026.4.13.0
Reference: https://github.com/bendlikeabamboo/barangay-boundaries-repository/releases/tag/v2026.4.13.0

NASA GPM IMERG via GIBS

Satellite-estimated surface precipitation rate from the Global Precipitation Measurement mission, published half-hourly with roughly 4 hours of latency. Drawn on the map as the “Satellite rain” overlay for comparison against the modeled rainfall and PAGASA gauge readings.

Tile endpoint: https://gibs.earthdata.nasa.gov/wmts/epsg3857/best/IMERG_Precipitation_Rate
Documentation: NASA GIBS API documentation

NASA MODIS Flood Detection via GIBS

Near-real-time surface water and flood detection (MCDWD) from the Terra and Aqua satellites, composited over the past 3 days at 250 m resolution. Drawn on the map as the “Satellite flood extent” overlay to corroborate community flood reports. Optical sensors cannot see through clouds, so heavy overcast can hide flooding.

Tile endpoint: https://gibs.earthdata.nasa.gov/wmts/epsg3857/best/MODIS_Combined_Flood_3-Day
Documentation: NASA MCDWD product documentation

NASA SRTM via Terrain Tiles on AWS Open Data

Global elevation rasters derived primarily from the NASA Shuttle Radar Topography Mission, used to shade low-lying flood-susceptible ground. Drawn on the map as the “Low-lying terrain” overlay; elevation is decoded from terrarium-encoded tiles directly on the GPU. Elevation alone is an approximation of flood susceptibility — drainage and local defenses are not modeled.

Tile endpoint: https://s3.amazonaws.com/elevation-tiles-prod/terrarium
Documentation: AWS Open Data registry entry

Mapbox Standard Satellite and Terrain DEM

Satellite imagery, 3D terrain elevation, and place labels behind every layer.

Documentation: https://docs.mapbox.com/mapbox-gl-js/guides/

Verified Albay coverage

Administrative names and boundaries were cross-checked against the PSGC listing as of 2026-06-30.

Barangays: 720
Municipalities: 15
Cities: 3
Local government units: 18

No official warning data. This monitor is a situational-awareness tool, not a substitute for advisories from PAGASA or your local disaster risk reduction office.