private string ExtractWKTFromKML(Stream stream, int points)
{
NetTopologySuite.Geometries.Geometry finalgeometry = null;
try {
stream.Seek(0, SeekOrigin.Begin);
}catch (Exception) {}
KmlFile file = KmlFile.Load(stream);
Kml kml = file.Root as Kml;
var placemarks = kml.Flatten().OfType <Placemark>();
foreach (var placemark in placemarks)
{
try {
NetTopologySuite.Geometries.Geometry geometry = KmlGeometryToGeometry(placemark.Geometry);
if (finalgeometry == null)
{
finalgeometry = geometry;
}
else
{
finalgeometry = finalgeometry.Union(geometry);
}
} catch (Exception) {
//throw new Exception(string.Format("Error with placemark {0}", placemark.Name));
}
}
string wkt = null;
if (finalgeometry != null)
{
finalgeometry = SimplifyGeometry(finalgeometry, points);
foreach (var p in finalgeometry.Coordinates.ToArray())
{
p.X = Math.Round(p.X, 2);
p.Y = Math.Round(p.Y, 2);
if (p is CoordinateZ)
{
p.Z = Math.Round(p.Z, 2);
}
}
wkt = finalgeometry.AsText();
}
return(wkt);
}
private string ExtractWKTFromShapefileZip(Stream stream, int points)
{
string uid = Guid.NewGuid().ToString();
string path = AppDomain.CurrentDomain.BaseDirectory;
if (!path.EndsWith("/"))
{
path += "/";
}
var shapeDir = path + "files/" + uid;
if (stream.Length > 1 * 1000 * 1000)
{
throw new Exception("We only accept files < 1MB");
}
using (ZipArchive archive = new ZipArchive(stream, ZipArchiveMode.Read)) {
archive.ExtractToDirectory(shapeDir);
}
//get all .shp files in unziped directory
var myFiles = Directory.GetFiles(shapeDir, "*.shp", SearchOption.AllDirectories);
GeometryFactory factory = new GeometryFactory();
NetTopologySuite.Geometries.Geometry finalgeometry = null;
foreach (var shapefile in myFiles)
{
ShapefileDataReader shapeFileDataReader = new ShapefileDataReader(shapefile, factory);
while (shapeFileDataReader.Read())
{
var geometry = (NetTopologySuite.Geometries.Geometry)shapeFileDataReader.Geometry;
if (finalgeometry == null)
{
finalgeometry = geometry;
}
else
{
finalgeometry = finalgeometry.Union(geometry);
}
}
//Close and free up any resources
shapeFileDataReader.Close();
shapeFileDataReader.Dispose();
}
string wkt = null;
if (finalgeometry != null)
{
finalgeometry = SimplifyGeometry(finalgeometry, points);
foreach (var p in finalgeometry.Coordinates.ToArray())
{
p.X = Math.Round(p.X, 2);
p.Y = Math.Round(p.Y, 2);
if (p is CoordinateZ)
{
p.Z = Math.Round(p.Z, 2);
}
}
wkt = finalgeometry.AsText();
}
return(wkt);
}