public void AddCities()
{
Towns = new WebClient().DownloadString(
"https://raw.githubusercontent.com/Gibbs/UK-Postcodes/master/postcodes.csv")
.Split('\r', '\n')
.Skip(1)
.Where(s => s != "")
.Select(s => s.Split(','))
.Select(s => new Place(s[0].Trim('\"'), int.Parse(s[1].Trim('\"')), int.Parse(s[2].Trim('\"')), s[3].Trim('\"'), s[4].Trim('\"'), s[5].Trim('\"'), s[6].Trim('\"'), s[7].Trim('\"'), s[8].Trim('\"'))).GroupBy(x => x.town)
.Select(grouping => grouping.First())
.ToArray()
;
_index = new SpatialIndex <Place>();
_index.init();
foreach (var place in Towns)
{
var point = place.MakePoint();
_index.add(new Rectangle(point.x, point.y, point.x + 1, point.y + 1), place);
}
}