Heimdallr

⚖ BSL 1.1 License

Real-time natural hazard monitoring

Choose which modules to activate

Interact with the map Click any marker for event details. Right-click or long-press for coordinates, nearest event, and reverse geocoding.

Map Legend Tap the info button on the map controls for a colour-coded legend of all active layers and markers.

Module Hub Open with the grid button or Ctrl+K to enable, disable, or pin modules to the top bar.

Controls & Settings Each module panel has tabs for events, source/filter controls, and per-module settings including notification thresholds.

Activity Feed Real-time stream of events from all modules. Filter by domain in the modules.

Global Settings Language, default map centre and zoom, layer order, and foreground service.

Keyboard Shortcuts

Ctrl+KModule Hub

Ctrl+RRefresh all

AActivity Feed

SSettings

?All shortcuts

EscClose panel

Aggregates severe weather alerts from ~190 national meteorological services via the WMO, plus animated weather overlays for precipitation, temperature, wind, and pressure. Tap the weather chip in the topbar to open the panel.

How to use:

Map

Alert polygons coloured by severity — red (Extreme), orange (Severe), yellow (Moderate), blue (Minor), light blue (Unknown)
Geometry loads progressively in 3 tiers: severe + extreme first, then moderate, then minor — a pulsing indicator shows progress
Click an alert in the list to load and highlight its individual polygon, even before bulk geometry finishes
Observation station markers with type-specific icons —
METAREA boundary lines (dashed + solid) toggled from the Maritime section in the Events tab
Click any alert polygon for a popup with event name, severity, area, member, effective/expiry dates, and source link

Controls tab

Source

WMO SWIC — CAP alerts from ~190 national services worldwide, updated via a single snapshot endpoint
Tap next to the source to reload it

Filters

Severity level — Unknown, Minor, Moderate, Severe, or Extreme (minimum threshold)
Show marine alerts — toggle to include or exclude maritime weather warnings
Hide expired — toggle to remove alerts past their expiration time

Observations

Four station types: thunderstorms, heavy rain, fog, and gale
Each type has time-period checkboxes to show or hide reports from different intervals
Toggle individual types on or off to control which observations appear on the map

Auto-refresh

Set frequency (30 s – 10 min) or disable
Per-source pill toggle / enables or disables WMO SWIC auto-update

Events tab

Two menu sections at the top: CAP Warnings and Maritime
CAP Warnings uses a 3-level drill-down: overview → member/country → alert detail
Main Page — region and member dropdowns to filter, severity pills showing alert counts, scrollable list of WMO members sorted by alert count
Member Events — tap a member to see its alerts as cards with severity border, event name, area, urgency, certainty, and relative time
Event Details — tap More Details on a card for full alert info: headline, effective/expiry dates, severity/urgency/certainty badges, source, and Show on Map button
Click any alert card to fly to its location and load its polygon geometry on the map
Maritime section shows METAREA boundary toggle and marine-flagged warnings

Weather Overlays

Animated satellite layers: precipitation, temperature, wind, and pressure — powered by MapTiler Weather SDK
Only one overlay visible at a time — tap an active layer button again to turn it off
Time slider scrubs through forecast hours; play/pause button animates automatically
Hover or tap the map while an overlay is active to see the value at that point (e.g. mm/h, °C, m/s, mBar)
Reset to Now button snaps the time slider back to the current moment
Per-layer opacity can be adjusted in the Settings tab

Settings tab

Source table — enable/disable and auto-refresh for WMO SWIC
Default filters — severity level, marine toggle, and hide expired applied on startup
Urgency filter — checkboxes for Immediate, Expected, Future, Past, and Unknown levels
Certainty filter — checkboxes for Observed, Likely, Possible, Unlikely, and Unknown levels
Display — show-on-startup toggle
Timing — auto-refresh interval
Default layer — which overlay to activate automatically (none, precipitation, temperature, wind, or pressure)
Overlay opacities — individual opacity sliders for precipitation, temperature, wind, and pressure layers

Tracks earthquakes from three networks — USGS, EMSC, and INGV. Tap the seismic chip in the topbar to open the panel.

How to use:

Map

Circle size and colour by magnitude — small green (minor) to large red (M6+)
Nearby markers cluster with a count badge — zoom in or click to expand
Click any marker for a popup with magnitude, place, time, depth, source, and detail link

Controls tab

Sources

Toggle USGS (worldwide), EMSC (Europe), and INGV (Italy) on or off
Enable EMSC WebSocket for a live stream — earthquakes appear instantly without refreshing
Tap next to a source to reload it individually

Filters

Time range — pick a preset (1 h – 3 days) or set custom start/end dates
Min and max magnitude (0–10)
Press Apply & Refresh to fetch with current filters

Auto-refresh

Set frequency (30 s – 10 min) or disable
Per-source pill toggles / choose which networks auto-update
WebSocket stays live independently of the timer

Events tab

Nearby earthquakes grouped by proximity and time — tap the header to expand
Each entry shows magnitude + type, place, time , depth, and source
Click any row to fly to its location on the map
Sort bar at the top: time, magnitude, or depth
Magnitude pills filter the list by level (M6+, M5+, M4+, <M4)

Settings tab

Source table — enable/disable and auto-refresh per source
Default filters — time range and magnitude applied on startup
Display — marker opacity slider, show-on-startup toggle
Timing — auto-refresh interval and cache duration
Grouping — distance (km) and time window for list clustering
Notifications — enable, set min magnitude and max age. Alerts fire when the app is backgrounded
Background monitoring (Android) — independent thresholds from notifications

Monitors volcanoes from three sources — USGS alerts, Smithsonian GVP catalog, and GDACS eruption reports. Tap the volcanic chip in the topbar to open the panel.

How to use:

Map

Triangle markers sized by alert level — larger for Warning, smaller for Normal
Colour matches alert level — red (Warning) through grey (Unassigned)
Click any marker for a popup with alert level, aviation colour, activity, elevation, region, and detail link

Controls tab

Sources

Toggle USGS (real-time US alerts), Smithsonian GVP (global catalog of ~1,400 volcanoes), and GDACS (live eruptions from VAACs)
Tap next to a source to reload it individually
Duplicate volcanoes across sources are merged automatically — USGS takes priority over GDACS over GVP

Filters

Alert level — all, advisory+, watch+, warning only, or unassigned only
Region — all, Europe, North America, Asia-Pacific, South America, or Africa
GDACS time range — how far back to fetch eruption reports (6 h – 30 days)

Auto-refresh

Set frequency (30 s – 10 min) or disable
Per-source pill toggles / choose which sources auto-update

Events tab

Two sections: Live Eruptions (GDACS) at top, Alert Statuses (USGS/GVP) below
Each entry shows alert badge, volcano name, location, elevation, and source
Click any row to fly to its location on the map
Sort bar at the top: alert level or time

Settings tab

Source table — enable/disable and auto-refresh per source
Default filters — alert level and GDACS time range applied on startup
Display — marker opacity slider, show-on-startup toggle
Timing — auto-refresh interval and cache duration
GVP alert thresholds — years since last eruption to derive Warning, Watch, and Advisory levels
Notifications — min alert level. Alerts fire when the app is backgrounded
Background monitoring (Android) — independent thresholds from notifications

Tracks active tsunami warnings, watches, and advisories from two sources — NWS and GDACS. Tap the tsunami chip in the topbar to open the panel.

How to use:

Map

Pulsating circle markers colour-coded by alert level — red (Warning), orange (Watch), blue (Advisory), grey (Information)
Marker size and pulse speed scale with severity — larger and faster for Warning, smaller and slower for Information
Click any marker for a popup with alert type, headline, affected area, onset, source, and detail link
Expired NWS alerts are removed automatically to keep the map current

Controls tab

Sources

Toggle NWS (US National Weather Service alerts) and GDACS (global earthquake-triggered tsunami risk) on or off
Tap next to a source to reload it individually

Filters

Alert level — all, information+, advisory+, watch+, or warning only
Region — all, Pacific, Atlantic, Indian, Mediterranean, or Caribbean
Min magnitude — filters GDACS events by triggering earthquake magnitude (NWS alerts always included)
Press Apply & Refresh to fetch with current filters

Auto-refresh

Set frequency (30 s – 10 min) or disable
Per-source pill toggles / choose which sources auto-update

Events tab

Each entry shows alert badge, headline, affected area, and onset/expiration times
GDACS alerts include triggering earthquake magnitude, depth, and estimated wave height
NWS alerts include official safety instructions when available
Click any row to fly to its location on the map
Alert-level pills filter the list by severity (Warning, Watch, Advisory, Information)

Settings tab

Source table — enable/disable and auto-refresh per source
Default filters — alert level applied on startup
Display — marker opacity slider, show-on-startup toggle
Timing — auto-refresh interval and cache duration (default 2 min, shorter for time-critical data)
Notifications — enable, set min alert level. Alerts fire when the app is backgrounded
Background monitoring (Android) — independent thresholds from notifications

Tracks active fires from two sources — NASA FIRMS satellite hotspots and NIFC US fire perimeters. Tap the wildfire chip in the topbar to open the panel.

How to use:

Map

Square markers sized and coloured by severity — small yellow (Low) to large red (Extreme)
Nearby markers cluster with a count badge — zoom in or click to expand
NIFC fire perimeters render as semi-transparent filled polygons beneath the point markers
Click any marker for a popup with severity, FRP, confidence, detection time, source, and detail link

Controls tab

Sources

Toggle NASA FIRMS (global satellite hotspots from MODIS & VIIRS) and NIFC (US active fire perimeters) on or off
Tap next to a source to reload it individually
Overlapping detections from FIRMS and NIFC are deduplicated automatically — FIRMS real-time hotspots take priority

Filters

Severity level — all, low, moderate, high, or extreme (based on fire radiative power, acreage, and confidence)
Region — global or specific continents (Europe, North America, Asia-Pacific, South America, Africa, Australia)
Detection days — how far back to show fires (1–10 days, based on first detection time)

Auto-refresh

Set frequency (30 s – 10 min) or disable
Per-source pill toggles / choose which sources auto-update

Events tab

FIRMS hotspots show severity badge, location, FRP (MW), and confidence (%)
NIFC perimeters show severity badge, fire name, acres burned, and containment (%)
Click any row to fly to its location on the map
Sort bar at the top: severity, intensity/size, or time
Severity pills filter the list by level (Extreme, High, Moderate, Low)

Settings tab

Source table — enable/disable and auto-refresh per source
Default filters — severity level and regions applied on startup
Display — marker opacity slider, show-on-startup toggle, geocode FIRMS locations for city/country names
Timing — auto-refresh interval and cache duration
Notifications — enable, set min severity. Alerts fire when the app is backgrounded
Background monitoring (Android) — independent thresholds from notifications

Tracks tropical cyclones and hurricanes worldwide using GDACS data — including forecast tracks, uncertainty cones, and wind radii. Tap the cyclone chip in the topbar to open the panel.

How to use:

Map

Animated rotating hurricane markers — size and colour scale with alert level and Saffir–Simpson category
Yellow dashed track line with numbered forecast points (visible at closer zoom levels)
Semi-transparent uncertainty cone showing the storm's predicted path range
Click any marker for a popup with storm name, category, wind speed, pressure, motion, source, and advisory

Controls tab

Sources

GDACS provides global tropical cyclone data with track geometry, forecast cones, and wind radii
Tap next to the source to reload it

Filters

Alert level — all, advisory+, watch+, or warning only
Ocean basin — all, Atlantic, Eastern Pacific, Western Pacific, Indian Ocean, or Australia/South Pacific
Min sustained wind speed (km/h) to filter out weaker storms

Auto-refresh

Set frequency (30 s – 10 min) or disable
Per-source pill toggle / enables or disables GDACS auto-update

Events tab

Each entry shows alert badge, storm name, basin, Saffir–Simpson category, and max wind speed (km/h)
Click any row to fly to its location on the map
Sort bar at the top: alert level or time
Alert-level pills filter the list (Warning, Watch, Advisory)

Settings tab

Source table — enable/disable and auto-refresh for GDACS
Default filters — alert level and basin applied on startup
Display — marker opacity slider, show-on-startup toggle
Timing — auto-refresh interval and cache duration
Notifications — enable, set min alert level. Alerts fire when the app is backgrounded
Background monitoring (Android) — independent thresholds from notifications

Tracks the International Space Station in real time — position, altitude, velocity, and predicted orbital path, updated every few seconds.

How to use:

Map

Marker & Popup

A satellite icon marks the current ISS position on the map
Click the marker for a popup showing latitude, longitude, altitude (km), velocity (km/h), and visibility
The popup stays open and updates live as new data arrives

Trajectory

A cyan line traces the station's predicted orbital path ~100 minutes ahead
Great-circle interpolation gives the line a smooth curve across the globe
The trajectory splits cleanly at the date line to avoid wrap-around artefacts

Settings tab

Update interval — how often the position refreshes (5 s – 60 s)
Trajectory points — number of prediction points (5–50) and time step between them (5–60 min)
Interpolation — smoothness of the trajectory curve (5–50 points per segment)
Display — trajectory opacity slider and show-on-startup toggle

Data from WhereTheISS.at API

Global tectonic plate boundaries overlaid on the map for geological context — bundled with the app and always available offline.

How to use:

Map

Semi-transparent boundary lines drawn in the module accent colour
Layer with seismic data to see how earthquake activity aligns with plate edges

Data & Attribution

Boundary data from the GPlates project by the EarthByte Group, University of Sydney
300 boundary features covering subduction zones, mid-ocean ridges, transforms, continental rifts, sutures, orogenic belts, and more
Bundled at build time — no network request needed, works fully offline

Settings tab

Opacity — adjust boundary line transparency
Line width — make boundaries thicker or thinner (1–5 px)
Show on startup — toggle whether the layer loads automatically