simple map
zips = FileAttachment("zip_test4.geojson").json()
nycParks = FileAttachment("parks_nyc_reduced@2.geojson").json()
subway_lines = FileAttachment("subway_lines@2.geojson").json()
subSts = FileAttachment("subway_sts@1.geojson").json()
d3 = require("d3@6")
chart = {
const width = 960,
height = 900;
const svg = d3.create("svg")
.attr("viewBox", [-60, 0, width, height]);
// Use Mercator projection
var projection = d3
.geoMercator()
.fitSize([width - 50, height - 50], zips);
var path = d3.geoPath().projection(projection);
var path2 = d3.geoPath().projection(projection);
var g = svg.append("g").attr("id", "paths");
g.selectAll("path") //d3 geopath
//svg
//.selectAll('path')
.data(zips.features) //get data to define path
.enter() //there are more data than elements, this selects them
.append("path") //appends path to data
.attr('class','outlines')
.attr("d", path) //The d attribute defines a path to be drawn, only applies to appended elements
.style("fill", "white")
.style('fill-opacity','.5')
.style("stroke-width", ".25")
.style("stroke", "#ccc")
//insert parks into map
g.selectAll("path") //d3 geopath
//svg
//.selectAll('path')
.data(nycParks.features) //get data to define path
.enter() //there are more data than elements, this selects them
.append("path") //appends path to data
.attr('class','outlines')
.attr("d", path) //The d attribute defines a path to be drawn, only applies to appended elements
.style("fill", "red")
.style('fill-opacity','.25')
.style("stroke-width", ".2")
.style("stroke", "rgb(255,0,0)")
g.selectAll("path2") //d3 geopath
//svg
//.selectAll('path')
.data(subway_lines.features) //get data to define path
.enter() //there are more data than elements, this selects them
.append("path") //appends path to data
.attr('class','outlines')
.attr("d", path) //The d attribute defines a path to be drawn, only applies to appended elements
.style('fill-opacity','0')
.style("stroke-width", ".35")
.style("stroke", "rgb(0,0,0)")
g.selectAll("circle") //d3 geopath
//svg
//.selectAll('path')
.data(subSts.features) //get data to define path
.enter() //there are more data than elements, this selects them
.append("circle") //appends path to data
.attr('cx',function(d) {return path.centroid(d)[0]})
.attr("cy",function(d) {return path.centroid(d)[1]})
.attr('r',1.5)
.attr('fill','black')
.style('fill-opacity','.9')
return svg.node();
}
Purpose-built for displays of data
Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
