Simple KML file reading

Output

Simple placemark
    37.42228990140251, -122.0822035425683, 0
Floating placemark
    37.4220033612141, -122.084075, 50
Extruded placemark
    37.42156927867553, -122.0857667006183, 50
Roll over this icon
    37.42243077405461, -122.0856545755255, 0
Descriptive HTML
    No Points
Tessellated
    No Points
Untessellated
    No Points
Absolute
    No Points
Absolute Extruded
    No Points
Relative
    No Points
Relative Extruded
    No Points
Building 40
    No Points
Building 41
    No Points
Building 42
    No Points
Building 43
    No Points
The Pentagon
    No Points
Absolute
    No Points
Absolute Extruded
    No Points
Relative
    No Points
Relative Extruded
    No Points

Program.cs

using SharpKml.Dom;
using SharpKml.Engine;

using var stream = new FileStream("./kml_samples.kml", FileMode.Open, FileAccess.Read);
var kmlFile = KmlFile.Load(stream);
var kml = kmlFile?.Root as Kml;
foreach(var item in kml.Flatten().OfType<Placemark>())
{
    var point = item.Flatten().OfType<Point>().FirstOrDefault();
    Console.WriteLine(item.Name);
    Console.WriteLine(point is null ?
        "    No Points" :
        $"    {point?.Coordinate.Latitude.ToString()}, {point?.Coordinate.Longitude.ToString()}, {point?.Coordinate.Altitude.ToString()}");
}