EML 3035 – Programming Concepts Project S20 Weather API Due date May 1st, 2020 by midnight. Goal Retrieve weather forecast data from a web server through an API and plot several physical variables in Matlab. Submission guidelines Upload a single .m file to Canvas under the Course Project assignment. Make sure the extension of your file is .m and nothing else. Key functions webread() Structure arrays API In this project you will become familiar with the concept of an API, Application Programming Interface, which is basically code that controls an access point to the Web Server. This way you can access information that is being stored in the Web. In our case, we will access weather data stored by openweathermap.org. Here you will be able to obtain current weather info, 5 days/3hour forecasts, weather maps, UV index and weather alerts. For this project we will focus on 5 days/3hour forecasts. 5 days/3hour forecasts In order to access the forecast inside the website mentioned above we need a key (something like a password) for the API. The key you will use is this one: b5904b7602f68fcca1d8886d36b36c4e In order to use the API through MATLAB we will use the built in function webread(). Check the Matlab documentation (https://www.mathworks.com/help/matlab/ref/webread.html) to learn about webread. You may also check the website openweathermap.org to learn how to call the API for that specific site. 1 All in all, if I use London as my city, the url passed into the webread function should look like this: 'http://api.openweathermap.org/data/2.5/forecast?q=London&APPID=key' where key is the password given above (b590….). The assignment Tasks to do for the 5 days/3hour forecast. You know how functions work. Webread is a function. It will have an input (the url) and an output. See examples in Matlab documentation. You may name the output any way you want. Once you are able to call the webread function, pay close attention to the output variable. This output variable will contain 40 data packets (5 days every 3 hours). Each packet contains temperature, pressure, humidity, and wind speed amongst multiple other things for a particular day and time. You can click and open the output in the Workspace and navigate through the different components. You will have to figure out how to extract the following weather variables: temperature, pressure, humidity and wind speed. Hint: look at the name of the tab that opens up when you double click a variable in the Workspace. Once you learn how to extract information from your output variable, create four figures and plot each variable versus time. Use days as the unit for the x-axis. The units for the variable on the y-axis will be determine by the web source. You will have to look up what their units are. https://openweathermap.org/forecast5 As a result you will have 4 figures. One for temperature, one for pressure, one for humidity and one for wind speed. Do this for 3 different cities (of your choice) in the world. Figure 1 shows an example for what the temperature plot should look like. 2 London Temperature [C] 8 6 4 2 0 -2 1 2 3 4 5 Days Figure 1: Temperature forecast for London 3 6
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