public static Layer <T> Deserialize(string file)
{
Layer <T> layer = new Layer <T>();
int validGeoms = 0;
using (var reader = new ShapefileDataReader(file, GeometryFactory.Default))
{
var projectionFile = Path.Combine(Path.GetDirectoryName(file), Path.GetFileNameWithoutExtension(file) + ".prj");
var projectionInfo = File.ReadAllText(projectionFile);
CoordinateSystems.COORSYSTEM detected = CoordinateSystems.DetectCoordinateSystems(projectionInfo);
bool convert = (detected != layer.coordinateSystem);
while (reader.Read())
{
T t = new T();
//import all fields by variable name
t.Geometry = reader.Geometry;
foreach (var field in t.GetType().GetFields())
{
if (reader.DbaseHeader.Fields.Select(x => x.Name.ToLower()).Contains(field.Name.ToLower()))
{
t.GetType().GetField(field.Name).SetValue(t, reader[field.Name]);
}
}
//convert from geodecial degrees to NAD83
if (convert)
{
t.Longitude = t.Geometry.Centroid.X;
t.Latitude = t.Geometry.Centroid.Y;
t.Geometry = CoordinateSystems.Convert(detected, layer.coordinateSystem, reader.Geometry);
}
else
{
var point = CoordinateSystems.Convert(layer.coordinateSystem, CoordinateSystems.COORSYSTEM.WGS84,
t.Geometry.Centroid.Y, t.Geometry.Centroid.X);
t.Longitude = point[0];
t.Latitude = point[1];
}
//Calculate max length of polygon
#region PolyLength
var hull = t.Geometry.ConvexHull();
Coordinate left = hull.Coordinate,
right = hull.Coordinate,
top = hull.Coordinate,
bottom = hull.Coordinate;
//Source: https://msi.nga.mil/msisitecontent/staticfiles/calculators/degree.html
//Source: https://gis.stackexchange.com/questions/142326/calculating-longitude-length-in-miles
//double lngToMeterScale = 111320f;
//double latToMeterScale = 110574f;
//double leftX = 0, rightX = 0, topY = 0, bottomY = 0;
foreach (var point in hull.Coordinates)
{
//double pointX = point.X * lngToMeterScale;
//double pointY = point.Y * latToMeterScale;
//leftX = left.X * lngToMeterScale;
//rightX = right.X * lngToMeterScale;
//topY = top.Y * latToMeterScale;
//bottomY = bottom.Y * latToMeterScale;
if (point.X < left.X)
{
left = point;
}
if (point.X > right.X)
{
right = point;
}
if (point.Y > top.Y)
{
top = point;
}
if (point.Y < bottom.Y)
{
bottom = point;
}
}
if (Math.Abs(right.X - left.X) > Math.Abs(top.Y - bottom.Y))
{
t.Length = Math.Abs(right.X - left.X);
}
else
{
t.Length = Math.Abs(top.Y - bottom.Y);
}
#endregion
t.Object_ID = layer.Shapes.Count + 1;
layer.Shapes.Add(t);
if (t.Geometry.IsValid)
{
validGeoms++;
}
}
Debug.Assert(layer.Shapes.Count == reader.RecordCount);
Console.WriteLine("{0}/{1} Valid Geometries in file {2} (converted: {3})", validGeoms, layer.Shapes.Count, Path.GetFileNameWithoutExtension(file), convert);
}
return(layer);
}
public Layer()
{
coordinateSystem = CoordinateSystems.COORSYSTEM.NAD83;
Shapes = new List <T>();
}
