block18.cs

// a helper class to access the new binned columns
public class BinnedHouseBlockData
{
    public float BinnedLongitude { get; set; }
    public float BinnedLatitude { get; set; }
    public float MedianHouseValue { get; set; }
}

// get an array of binned housing data
var binnedHhouses = context.Data.CreateEnumerable<BinnedHouseBlockData>(transformedData, reuseRowObject: false).ToArray();

// plot median house value by binned latitude and longitude
var chart = Chart.Plot(
    new Graph.Scattergl()
    {
        x = binnedHhouses.Select(v => v.BinnedLongitude),
        y = binnedHhouses.Select(v => v.BinnedLatitude),
        mode = "markers",
        marker = new Graph.Marker()
        {
            symbol = "square",
            size = 32,
            color = binnedHhouses.Select(v => v.MedianHouseValue),
            colorscale = "Jet"
        }
    }
);
chart.WithXTitle("Binned Longitude");
chart.WithYTitle("Binned Latitude");
chart.WithTitle("Median house value by binned location");
chart.Width = 600;
chart.Height = 600;
display(chart);