static async Task Main(string[] args)
{
// let's show you what's going on.
OsmSharp.Logging.Logger.LogAction = (origin, level, message, parameters) =>
{
Console.WriteLine($"[{origin}] {level} - {message}");
};
await Download.Download.ToFile("http://planet.anyways.eu/planet/europe/luxembourg/luxembourg-latest.osm.pbf", "luxembourg-latest.osm.pbf");
await using var fileStream = File.OpenRead("luxembourg-latest.osm.pbf");
// create source stream.
var source = new PBFOsmStreamSource(fileStream);
// show progress.
var progress = source.ShowProgress();
// filter all power lines and keep all nodes.
var filtered = from osmGeo in progress
where osmGeo.Type == OsmSharp.OsmGeoType.Node ||
(osmGeo.Type == OsmSharp.OsmGeoType.Way && osmGeo.Tags != null && osmGeo.Tags.Contains("power", "line"))
select osmGeo;
// convert to a feature stream.
// WARNING: nodes that are part of power lines will be kept in-memory.
// it's important to filter only the objects you need **before**
// you convert to a feature stream otherwise all objects will
// be kept in-memory.
var features = filtered.ToFeatureSource();
// filter out only linestrings.
var lineStrings = from feature in features
where feature.Geometry is LineString
select feature;
// build feature collection.
var featureCollection = new FeatureCollection();
var attributesTable = new AttributesTable {
{ "type", "powerline" }
};
foreach (var feature in lineStrings)
{ // make sure there is a constant # of attributes with the same names before writing the shapefile.
featureCollection.Add(new Feature(feature.Geometry, attributesTable));
}
// convert to shape.
var header = ShapefileDataWriter.GetHeader(featureCollection.First(), featureCollection.Count);
var shapeWriter = new ShapefileDataWriter("luxembourg.shp", new GeometryFactory())
{
Header = header
};
shapeWriter.Write(featureCollection);
}
public static Geometry ToGeometry(this FeatureCollection features)
{
if (features == null)
{
throw new ArgumentNullException(nameof(features));
}
if (features.Count != 1)
{
throw new NotSupportedException($"Right now only one geometry pear feature is supported. Geometry count: {features.Count}");
}
return(features.First().Geometry);
}
public static byte[] Serialize(FeatureCollection fc, GeometryType geometryType, byte dimensions = 2, IList <ColumnMeta> columns = null)
{
var featureFirst = fc.First();
if (columns == null && featureFirst.Attributes != null)
{
columns = featureFirst.Attributes.GetNames()
.Select(n => new ColumnMeta()
{
Name = n, Type = ToColumnType(featureFirst.Attributes.GetType(n))
})
.ToList();
}
using var memoryStream = new MemoryStream();
Serialize(memoryStream, fc, geometryType, dimensions, columns);
return(memoryStream.ToArray());
}