![]() We’ll start with the development of a basic JS connector map in four moves and then make a few tweaks to make it look awesome. Step by step, we will be visualizing a route of the famous ancient Silk Road. In this tutorial, you’ll learn how to quickly create a compelling interactive one using JavaScript. maps are designed to be ideal for visualizing routes and other links between locations in geospatial data analysis. Now you can use the loadJsonFile method provided by the Data Adapter to load JSON. ![]() It is easy to load data from a JSON file using the Data Adapter helper module of An圜hart, which should be added to the section: I have downloaded the JSON version and you can find it here (data as of April 14). In light of the COVID-19 pandemic, I will create a JavaScript choropleth map that will visualize the current situation around the world using data from the European Center for Disease Prevention and Control ( ECDC). Step 3: Prepare the data you want to visualize Load the data The choropleth map code will be written here GeoData, which contains information about the geographic locations.Īdditionally, I will use Proj4js, a free open-source JavaScript library that transforms point coordinates to geographic coordinates.Geo Maps, which contains the necessary information to create geo map charts, and.Core, which is the the basic module needed in order to use any other module,.In this tutorial, I will use the CDN, but keep in mind that you can download the scripts if you want.įor the choropleth map that I have in mind, I will need the following modules: This specific library is lightweight, flexible, and easy to get started, particularly thanks to a greatly written documentation and a lot of samples in the map gallery. JavaScript charting libraries are very popular nowadays they provide commonly needed functions out of the box to make the developing process simpler and faster. To create a choropleth map along this tutorial, I will use An圜hart’s AnyMap JS library which, as its name suggests, is specifically designed to produce maps. Second, you should go to the section and reference all the appropriate JS scripts you are going to use. In this case, using “100%” in both width and height parameters will make the visualization occupy the entire page. Note that you can use CSS rules in the block to define how you want your upcoming JavaScript choropleth map to be placed. To identify this later in the code, you should also give it an id attribute of your choice. Give it a title and create an HTML block element (for example, ) to place your map chart. The first thing you need to do is create a basic HTML page. Step 1: Create the HTML page for your map Here is a choropleth map that will be the final output of the first part of this tutorial: Prepare the data you want to visualize.Generally, building a JavaScript-based chart or map requires four basic things: Then I will add a legend, customize the tooltip, and add bubbles to visualize the number of deaths. I will start with a basic choropleth map that will graphically represent the confirmed cases. Each area is colored or shaded differently according to the value of the given data, making it easy to grasp how a measurement varies across a territory.įor this JS mapping tutorial, I will use open COVID-19 data to show the distribution of confirmed cases and deaths around the world by country. What exactly are choropleth maps? When you break down the word, you see that choro- (“ choros”) means “ area” and pleth- (“ plethos”) means “ multitude.” Exactly, these maps are used to visualize statistical data related to multiple geographic areas. Have you wondered how such data visualizations are built? Are you interested in making them by yourself? If so, stay with me through this JS charting tutorial, where I will show you how to create an interactive JavaScript choropleth map from scratch but with ease.īasic knowledge of HTML5 and JS is always helpful, but even if you are a beginner in this field, understand these four simple steps and you will be able to quickly get a good-looking cross-platform interactive choropleth map data visualization for your app or website! These days you see choropleth maps in a variety of webpages and utilized for various subjects.
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