A Large Network, and the Gaps It Still Has
China runs the world's largest weather-observation network: more than 60,000 stations at national level, and still blind spots in the mountains, at sea, and on the border. Smart meteorology puts an automatic weather station (AWS), a weather radar, a radiosonde, and an agricultural microclimate station on a link that collects the observation, watches the box, and alarms when it goes quiet. Agriculture, transport, energy, and disaster response all read that stream. A bad observation is a bad forecast.
Observation equipment is a market above RMB 10 billion, and automatic stations, radars, and soundings keep being replaced. The service is building a space–ground–air network: ground stations, satellites, drones, and ships. Commercial weather for farms, energy, and aviation is pushing instruments further down the chain. An automatic station is expected to hold temperature to ±0.2°C and humidity to ±3% RH, rain to 0.1 mm, and to upload every 1 to 10 minutes.
The Meteorology Law covers observation and the forecast. The plan for the station network is the build-out. Instruments have to meet WMO practice and the domestic meteorological standards. What leaves the station is also under the rules for meteorological data security and sharing.
Why a Walk-around Is Too Late
The station is where the truck does not go. Inspections are rare, so a dead sensor or a missing hour is found late. Power, the radio, and the instrument state report themselves, and the crew drives to the one that actually failed.
A forecast that needed the last few minutes. A warning is built on observations that are minutes old, not a form filled in at the end of the shift. 4G or 5G is what gets the sample up in time. The link matters most in the weather that is trying to take it down.
Four sources, four formats. A ground station, a radar, a satellite, and an industry microclimate box do not share a file layout. One platform takes them in, puts them in one shape, and hands that to the fusion and the forecast.
What Gets Connected
The automatic station. Temperature, humidity, pressure, wind, rain, and radiation go up over 4G or NB-IoT. Power, the radio, and the sensor health go with them. A fault alarms. Firmware and a parameter change can be pushed without a climb.
The field and the industry box. An agricultural microclimate station, a soil-moisture station, and a greenhouse sensor sit in the plot and feed the agromet platform: precision work on the farm, and a warning before a disaster. Transport, energy, and environmental stations need the same kind of link.
Radar and the radiosonde. A weather radar and a sounding station report run state and fault codes so a remote diagnosis can be booked. The observation itself has to reach the forecast center while the shift is still using it.
Who Builds It, and Two Networks
Upstream is the sensor: temperature, humidity, pressure, wind, rain. Midstream is the station integrator and the platform. Downstream is the meteorological bureau, then agriculture, energy, and transport. One provincial bureau put 1,200 agricultural microclimate stations on 4G. Farmers received disaster warnings about 95% of the time the service sent them. A new-energy operator put a wind-mast monitor on the link and into the power-forecast model. Accuracy rose about 8%.
Terms on the same log: AWS, an automatic weather station; WMO, the World Meteorological Organization; a radiosonde, the instrument a balloon carries for temperature, pressure, and humidity aloft; multi-source fusion, reading those different observations together so the forecast is less wrong.
Where It Is Heading
Models are taking over the quality check and the "this reading is nonsense" call. Commercial weather is pushing instruments onto sites the bureau never staffed. Dual-carbon work is why energy and agriculture now want the same observation the forecast office uses. SimtoLink supplies 4G and NB-IoT for the automatic station and the microclimate box, so a ridge site still delivers its minute when the road is closed.
Summary
Forecast quality is observation quality, and observation quality is whether the station reported. Density goes up only if a remote box can be trusted. SimtoLink's part is that report: a station whose data has to arrive in minutes, from a place with no one to press send.