Foot Traffic in Manhattan (Time Series)

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      <title>Foot Traffic</title>
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<h1>Foot Traffic in Manhattan</h1>
      <p>Relative foot traffic over the course of the day, averaged over all of Manhattan.</p>

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var xScale=d3.scale.linear()
                      .range([dv.pad_left,dv.width-dv.pad_right])
                      .domain(d3.extent(data,function(d){return +d.hour;}));

var yScale=d3.scale.linear()
                      .range([dv.height-dv.pad_bottom,dv.pad_top])
                      .domain(d3.extent(data,function(d){return +d.Npeople;}));

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         var yAxis=d3.svg.axis().scale(yScale).orient("left");

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               .attr("class","plot x axis")
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               .attr("class","plot x label")
               .attr("x",dv.pad_left+(dv.width-dv.pad_left-dv.pad_right)/2.0)
               .attr("y",dv.height-dv.pad_bottom+dv.pad_xaxis)
               .text("Hour")
               .attr("text-anchor","middle");

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               .attr("transform","translate("+dv.pad_left+",0)")
               .call(yAxis);
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               .text("Estimated relative foot traffic");

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                          .x(function(d) { return xScale(+d.hour); })
                          .y(function(d) { return yScale(+d.Npeople); });
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               .attr("class","plot points")
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               .attr("cx",function(d){ return xScale(+d.hour);})
               .attr("cy",function(d){ return yScale(+d.Npeople)})
               .attr("r",5);

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