They store data as attribute-value pairs, such as "Name": "Bob" in our example below. Both JSON and GeoJSON are open standard file formats that text-based (not binary). GeoJSON is a spatial data format based on the JSON format. We’ll add some of our own data to the map next. Your web page should now have a map with Stamen’s Toner tile layer. add the base map = Stamen Toner tile layerĪttribution: 'Map tiles by Stamen Design, CC BY 3.0 - Map data © OpenStreetMap', add an empty map called "catmap" to the page in the mapid div Note: from now on, we’ll be working in the section, so the code will just show this section to avoid clutter and focus on what’s changing in the code. Stamen has several free (and beautiful) tile services that we can use. Other require registration or charge a fee. The data is stored on a server and we can request the data show up in our map. The limited color palette of the Toner tile service will make it easier to see the data we’ll be loading later.Ī tile service is a pre-built background layer that is available at various geographic scales. It can get confusing sometimes, so have patience with yourself.įirst, we’ll create an empty map in our mapid, then we’ll load Stamen’s Toner tile service to use as a background layer. Outside of this section, you’ll be writing HTML. is how you indicate a comment in JavaScript. Inside the section, we’ll now be writing javascript. We’ll make a simple one to start and add more data later. ĬHECK YOUR WORK: Compare your code with example code up to this point in the workshop. Just below your map (and inside the body section), add open and closed tags. Make sure your tags open and close in the right order.įinally, we need to add a section to our code to hold the Leaflet JavaScript code we will write to make our map. If the page doesn’t load, however, you’ll need to troubleshoot your code. If you reload your index.html file in your browser, you shouldn’t notice any difference. We’re definiting the style inside the tag to make it easier to see how it applies to this specific and to keep the code for the map all in one place. There are many good reasons to choose any of these places. We can define the style of the inside the tag (as we have done below) or we could do it in the of the document in a subsection, or in a separate CSS file. This will let us create settings and code that apply to this specific. If it has an error or the text doesn’t show up, you’ll need to debug your code.Ī element defines a section in your HTML document. The code we just added doesn’t make any visible changes on our website so if you reload your web page, you won’t notice anything new, but it should load. Comments are information for a person writing or reading the code and don’t render on the website. Note that in HTML, comments are written like this. This webmap shows the locations of UC Davis campus community cats. We could save a static version of this library in our website folders and point to that, or we can link to an online version of it, like we have done in the code below. For R or Python users, this is similar to loading packages or libraries in your code. Loading the Leaflet JavaScript file enables our webpage to have access to the functions and tools in the Leaflet Library. The pre-made file we’ll load specifically styles the map elements made with Leaflet. You can think of this as the parameters that set the way certain objects are displayed in a website. Run npm test to make sure you haven't introduced a new 'feature' accidentally.In the head section of our webpage, we need to add some information that will tell our map how to appear (the CSS file) and where to find the Leaflet package (Leaflet JavaScript file).ĬSS stands for Cascading Style Sheet.This will compile minified source in a brand new dist directory, launch a tiny webserver and begin watching the raw source for changes. Install the dependencies with npm install.You can see your web maps (that are open to the public) with URL parameter as the below. So, welcome your contributions to support fully! Demo
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