How is the data of each weather forecast APP accessed? Are they all from the same source?

First of all, it can be made clear that all meteorological data must come from the official, and no one should dare to publish the weather data in an unofficial name. But when the national weather data is not accurate, all companies are faced with a problem, how to make their own data more accurate than competing products? 1. Why is the national weather data inaccurate?

Some of the weather data in China are ground, high altitude and radar observation data, which will be automatically summarized to the communication station of the National Meteorological Information Center.

Part of it is satellite data. For example, Fengyun satellite in China usually takes more than 20 minutes to complete the global scanning, so this part of the data usually has a delay of about half an hour.

Finally, the forecast data. There are some standard models in meteorology, and it takes a long time to run the model, package, transmit and distribute data (due to the amount of data). For example, the meteorological bureau may use the data of the European central model system, with some delay, but the characteristic of the forecast is that as time approaches, the more accurate the forecast is, the easier it is to understand. As far as I know, some research institutions of national universities also have their own models, and I dare not say which one is the most accurate.

(Part of the information comes from China Meteorological Network)

2. National meteorological data may be incomplete.

Sometimes we want to get weather data through the latitude and longitude obtained by the mobile phone sensor, or through? IP？ Address to get weather data, these are very common needs, and the national weather data? API？ It may not be supported.

In other words, local meteorological stations have some local meteorological data, which belong to provincial meteorological data and do not need to be reported to the national level. What about natural national meteorological data? API？ No, but the local government will still announce it.

In other words, many people are concerned about PM2.5, and these data are not from the Meteorological Bureau, but from the Environmental Protection Agency, which has no air quality forecast and has to obtain it from other institutions.