1. Each node represents a location from the PE3_butterysurvey_locatfonsjson dataset: 1. Position values for the nodes are given under the word property. 2. Nodes should visually encode the number of butteries that were observed at that location during the survey (the butteryCount property). 3. In addition to this, the nodes for locations where zero butteries were observed should be visually different from those where butteries were seen. It should be immediately obvious to the viewer which nodes have no butteries and which nodes do. This must be a different visual element to that used to indicate how many butteries were seen at other locations. You cannot use the same visual variable for each. 2. Each edge represents a route from the PE3_butterysurvey_routeston dataset 1. Position values for the start and end points of edges are given under the route Coords property. 2. Edges should visually encode the number of times the route was used. This information is given by the routeUses property. 3. Appropriate styling should be used for both the nodes and edges. This includes the choice of visual variable used to differentiate between the different types of nodes (i.e., 0 versus 1 or more butteries). 4. All nodes and edges should be spatially aligned with the underlying map (already given by the template). All nodes and edges should be on or within the Royal Park boundary, but outside of the Melbourne Zoo boundary. 5. All nodes should appear in front of the edges. 6. For the purposes of this assignment, no legend is required