redlined_and_imperviousSurfaceArea = {
const svg = d3.create("svg")
.attr("width", width)
.attr("height", height)
svg.append("g")
.selectAll("path")
.data(neighborhoods.features)
.join("path")
.attr("fill", d => imperviousAreaColor(imperviousAreaByNeighborhood.get(d.properties.TRACTCE.replace(/^0+/, ''))))
.attr("d", path)
.append("title")
.text(d => `Impervious Surface Area (%): ${d3.format(".1f")(imperviousAreaByNeighborhood.get(d.properties.TRACTCE.replace(/^0+/, '')))}`);
svg.append("g")
.selectAll("path")
.data(redlinedNeighborhoods.features)
.join("path")
.attr("fill", "none")
.attr("stroke", d => d.properties.holc_grade == "D" ? "white" : "none")
.attr("stroke-width", "2px")
.attr("stroke-linejoin", "round")
.attr("d", path);
return svg.node();
}