Data sources
National weather radar sources
The national radar networks behind the DroneInfo nowcast. Every network here is documented the same way: what it publishes, the licence it carries, and how it says it has no answer. That last one is where most integrations go wrong.
United States
NOAA MRMS PrecipRate
How the US Multi-Radar Multi-Sensor precipitation rate product encodes absence, why a one-time GeoTIFF conversion brings a point read down to 113 ms, and what the -3 and -1 sentinels actually mean.
Japan
JMA High-Resolution Precipitation Nowcast
How Japan's High-Resolution Precipitation Nowcast is read from public map tiles rather than a data file, why a fixed zoom goes silent in dry weather, and why a transparent pixel is not a zero.
Denmark
DMI Radar Composite
How DMI's five-radar Danish composite publishes reflectivity in dBZ rather than a rate, and the Marshall-Palmer conversion and ODIM sentinels that turn one into the other.
United Kingdom
Met Office UK Composite Rain Rate
How the Met Office UK composite rain-rate radar publishes a direct rate in British National Grid projection, and the two ways an earlier decoder confused a broken read with an uncovered point.
Germany
DWD RV Radar Composite
How Germany's DWD RV radar composite, reached through the Bright Sky community proxy, converts its integer units to mm/h and where a request gets no reading at all.
Norway
MET Norway Nowcast
How MET Norway's Nowcast 2.0 reports radar coverage explicitly through a named field and an HTTP status, and why a blocked User-Agent looks like an outage.
Canada
ECCC GeoMet Radar Composite
How Environment and Climate Change Canada's North American radar composite is read with a single WMS GetFeatureInfo query, and why a 0 mm/h reading cannot yet be told apart from no radar having looked at all.