d3v4 Multiple Pie Charts on Map - Data from CSV

Based on a question from Stack Overflow, creating multiple charts on a map in d3.

http://stackoverflow.com/questions/41949622/piechart-over-a-map-point-using-d3-js

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
	<style>
		svg {	
			background: #9ecae1;
		}
		.mesh {
			fill:none;
			stroke: white;
			stroke-width: 0.5px;
		}
		
		.land {
			fill: #41ab5d;
		}
	</style>	
	<script src="https://d3js.org/d3.v4.min.js"></script>
	<script src="https://d3js.org/topojson.v1.min.js"></script>	
</head>
<body>

// Projection variables
var projection = d3.geoMercator()
				   .center([81,22])
				   .scale(800)
				   .translate([width/2,height/2]);
				   
var path = d3.geoPath().projection(projection);

// Pie chart variables:
var arc = d3.arc()
			.innerRadius(0)
			.outerRadius(radius);
			
var pie = d3.pie()
			.sort(null)
			.value(function(d) { return d; });
			
var color = d3.schemeCategory10;

// Draw geographic features
d3.json("world.json", function(error, world) {
    g1.insert("path", ".land")
		.datum(topojson.feature(world, world.objects.countries))
		.attr("class", "land")
		.attr("d", path);
		
	g1.append("path")
      .datum(topojson.mesh(world, world.objects.countries, function(a, b) { return a !== b; }))
      .attr("class", "mesh")
      .attr("d", path);
});

// Draw pie charts,
d3.csv("water.csv", function(error, water) {
	var points = g2.selectAll("g")
		.data(water)
		.enter()
		.append("g")
		.attr("transform",function(d) { return "translate("+projection([d.lon,d.lat])+")" })
		.attr("class","pies")
		
	points.append("text")
		.attr("y", -radius - 5)
		.text(function(d) { return d.label })
		.style('text-anchor','middle');
		
	var pies = points.selectAll(".pies")
		.data(function(d) { return pie(d.data.split(['-'])); })
		.enter()
		.append('g')
		.attr('class','arc');
	
	pies.append("path")
	  .attr('d',arc)
      .attr("fill",function(d,i){
           return color[i+1];     
      });
});
</script>
</body>

https://d3js.org/d3.v4.min.js

https://d3js.org/topojson.v1.min.js