Read GPX Files using C#

ReadGPXFiles_CSharp.md

Learn how to read GPX files using C#: https://blog.aspose.com/2022/05/06/read-gpx-files-using-csharp/

The article covered the following topics:

1. C# API to Read GPX Files
2. Read Waypoints from the GPX File
3. Read Routes from the GPX File
4. Extract Tracks from GPX File
5. Read GPX Nested Attributes

ReadGPXFiles_CSharp_ReadGPSNestedAttributes.cs

// This code example demonstrates how to read GPX Nested Attributes from GPX file
// Specify GPX option
GpxOptions options = new GpxOptions()
{
    ReadNestedAttributes = true
};


// Load the GPX file and open layer to read features
using (var layer = Drivers.Gpx.OpenLayer(@"D:\Files\GIS\nested_data.gpx", options))
{
    foreach (var feature in layer)
    {
        // Check for MultiLineString geometry
        if (feature.Geometry.GeometryType == GeometryType.MultiLineString)
        {
            // Read segment
            var lines = (MultiLineString) feature.Geometry;
            for (int i = 0; i < lines.Count; i++)
            {
                Console.WriteLine($"....segment({i})......");
                var segment = (LineString)lines[i];

                // Read points in segment
                for (int j = 0; j < segment.Count; j++)
                {
                    // Look for attribute
                    string attributeName = $"name__{i}__{j}";
                    if (layer.Attributes.Contains(attributeName) && feature.IsValueSet(attributeName))
                    {
                        // Print a point and attribute
                        var value = feature.GetValue<string>(attributeName);
                        Console.WriteLine($"{segment[j].AsText()} - {attributeName}: {value}, ");
                    }
                    else
                    {
                        // Print a point only
                        Console.WriteLine(segment[j].AsText());
                    }
                }
            }
            Console.WriteLine("..........");
        }
    }
}

ReadGPXFiles_CSharp_ReadRoutes.cs

// This code example demonstrates how to read GPS routes from GPX file
// Load the GPX file
var layer = Drivers.Gpx.OpenLayer(@"D:\Files\GIS\schiehallion.gpx");

foreach (var feature in layer)
{
    // Check for LineString geometry
    if (feature.Geometry.GeometryType == GeometryType.LineString)
    {
        // Read Routs
        LineString ls = (LineString)feature.Geometry;

        foreach (var point in ls)
        {
            Console.WriteLine(" X: " + point.X + " Y: " + point.Y + " Z: " + point.Z);
        }
    }
}

ReadGPXFiles_CSharp_ReadTracks.cs

// This code example demonstrates how to read Tracks from GPX file
// Load the GPX file
var layer = Drivers.Gpx.OpenLayer(@"D:\Files\GIS\nested_data.gpx");

foreach (var feature in layer)
{
    // Check for MultiLineString geometry
    if (feature.Geometry.GeometryType == GeometryType.MultiLineString)
    {
        // Read track
        var lines = (MultiLineString)feature.Geometry;
        foreach(var line in lines)
        {
            Console.WriteLine(line.AsText());
        }
    }
}

ReadGPXFiles_CSharp_ReadWayPoints.cs

// This code example demonstrates how to read waypoints from GPX file
// Load the GPX file
var layer = Drivers.Gpx.OpenLayer(@"D:\Files\GIS\St_Louis_Zoo_sample.gpx");

foreach (var feature in layer)
{
    // Check for Point geometry
    if (feature.Geometry.GeometryType == GeometryType.Point)
    {
        // Read Points
        Point point = (Point)feature.Geometry;
        Console.WriteLine(point.AsText() + " X: " + point.X + " Y: " + point.Y);
    }
}