Data Sources
Checking sources…
Live sources
If a source isn't working, its row in “Am I Safe?” shows as unavailable instead of giving an all-clear. In an emergency, always follow DMC instructions and call 117.
Built-in data
Past flood mapsObserved · UNOSAT and Copernicus EMS satellite flood maps
Ground height and slopeDerived · Copernicus DEM GLO-30 (about 30–90 m, a few metres either way). Shows the lie of the land, never how deep water would get.
Updated by hand when new maps are published, not checked live.
What the tags mean
Official: a warning issued by a Sri Lankan agency (DMC, NBRO, Irrigation Department).
Observed: something measured or seen, like a gauge reading, a recorded earthquake or a satellite map.
Forecast: a computer model's prediction, which can be wrong.
Derived: our own reading of other data, like a possible tsunami after a large undersea quake. Not an official warning.