This video guide shows how we can create GIS desire lines and then configure them to visualise food miles. Open the ready-made map called Food miles and then click on the layers panel on the left. And you'll see one layer appears already, which is UK as a food destination, the red dot just here. And we're going to make the other layer visible by clicking the Visibility icon here, and you'll see that the various source countries for the ingredients of chicken korma appear. That's why this layer is called Food miles CK standing for chicken korma. It's abbreviated so that we can make the attribute titles a bit shorter later on. In order to create the desire lines, what we need to do is to tell the map which destination we're going to use and also to tell it what the sources are of those ingredients. So we go to the food destination, we click the small three dots here to open the properties, three dots stands for the options, and then we're gonna go to the analysis tool, which is shown by this icon here in the right panel. We click that and we then see some options for tools. So we click tools and then we scroll down to see the use proximity dropdown, so we click that and then we'll see one of these tools is called Calculate Travel Cost. And in spite of its name, that is the one that will create desire lines. So we click that and open to panel inviting us to tell the tool where do you want the layers to come from and to. So we want the information to come from the ingredients, which is the food miles chicken korma layer represented by the orange dots on the map. So we select that one for from, and then we say we want it to go to obviously to the UK. So we click Layer and then we can see the UK food destination. We select that one for the two layer. Our next step, you have to scroll down a little bit more for this one, is just to select the measurement type. Now in our case, we want to select something called line distance. The default is for driving time, but if you click the drop down here, you'll see the last option is the one we want, which is line distance so we select that. So as long as that says line distance, we're going well, then we need to give our output layer a name. This is the output for the desire lines. So I'm gonna click on that and type food miles UK. Keep the name fairly simple so that that will make life easier later on for attribute names, et cetera. Then we click Run and it will start to generate the desire lines. You can check the view status by clicking this blue button here and it gives you a rough idea of the progress that's been made. The process of creating the desire lines can take a little while depending on internet speed. So a successful result, our desire lines have been created, and we want to save that work so we click Save and save our map. You can give it a different name if you want to. For example, you call it food miles 1 or food miles with your initials. And then we've saved our work and we can move on to configure the lines. Now, configuring our food miles desire lines means making use of the data that they're carrying. If we click on any of them, we see in the popups there's an awful lot of data that they have and some of that data could be quite useful. So to make use of that data, we find the food miles layer, just check that it's the correct layer by switching the visibility on and off, making sure we leave it on. Go to the options for finding where we find show properties, and then we find Properties, we go to the Symbology panel just here and click Edit layer style. In the first, option Choose attributes in this section, it's by default showing destination ID. We don't really want that so we're going to click the X to delete that, but we're going to click Field instead to make a selection of fields we do want to show. So we click Field and then scroll down to select two of the attributes. And the ones that we want are about the number of ingredients. So we see one there quite near to the bottom Number of ingredients, and we click that. And then the next one we want is going to be to do with the country that we are sourcing ingredients from, and there's one there called Source country. So we click that one and then we click Add to make sure the lines reflect those and the lines will change. And straight away we see an improvement with the temporary legend here. So we have colour coding for the countries, the source countries, and further down, we have proportionalized the desire lines to show the number of ingredients that different countries supply. So what we have here are default options, but we can refine those further if we click in this section, Pick a style, Types and Size, and click Style options. And then find the panel that says Counts and Amounts size, and once again, click Style options for that. And we're going to change the size range but before we do, so just untick this one that says Adjust size automatically. And we're not gonna change the size that much so I'm gonna untick that and we're gonna change the pixels for the lower end to two. And you can see the smaller contributors have gone up to make them a little bit more visible. And then we can make the larger one larger. I'm gonna suggest we go up to 18 and then we click done. Now we could leave it at that but there is another option before we carry on. You can go to the Types and Styles section here and click Style options where you have the option to change the symbol style. You click the pen and it will give you different colour ramps that you can choose. I'm not gonna do that, but that is something you could do. So when we got to that stage, we click Done three times, and we have our map showing the configured desire lines to show food miles from different countries providing the ingredients to the UK for chicken korma. One last thing you might want to try to make the visualisation a little bit more effective is by changing the base map. So I'm gonna click the base map gallery and select Dark Grey Canvas because that shows up the desire lines a lot better. So once I've done that, I'm gonna shut the base map gallery and then click Legend so we can interpret the symbols using the food mile colours for the source countries and the variations in their widths in proportion to number of ingredients the countries supply, and then we can save our map as we have done before.