Adding points to the map:
Imported csv with longitude and latitude of train stations
Filtered this based on the two SA4s
Imported csv with longitude and latitude of train stations
added following:
const points = bounds
.selectAll("circle")
.data(trains)
.join("circle")
.attr("class", "circle")
.attr("cx", d => projection([d.longitude, d.latitude])[0])
.attr("cy", d => projection([d.longitude, d.latitude])[1])
.attr("r", 4)
Styled the circles in css