Weather apps, which many people use on their cell phones for actual weather information, get their real time weather data information using certain api. Some of them are open source codes but I am interested how it works? My first guess is that it makes internet search over available weather data sources and, applying certain interpolation techniques provides "actual" weather for desired location.
Here is a Xamarin example which shows how to access OpenWheatherMap. It has at least a free download option. The data are in XML and/or Json.
https://developer.xamarin.com/samples/mobile/Weather/
http://openweathermap.org/
Regards,
Joachim
Hi Branislava Lalic
It takes position (latitude and longitude) of the user, translates this position into location name (country + region + city), makes the Internet search over available weather data sources (Yahoo weather for example), get the page source of the result page (in HTML format), search for the specific HTML tag to get desired information.
Regards,
Dinh
The weather apps on smartphone, smart devices use GPS to locate its latitude and longitude (if you turn off GPS, they use Wifi to locate, but the wifi is usually less exact). They use these value and combine with some APIs function that were issued by online services, such as, weather.com, yahoo weather etc. The input parameters might be the latitude and longitude. The output parameters contain temperature, humidity etc. The weather apps use these values to display on their interface.