add SatelliteDownloader

SatelliteProvider/DTO/GeoPoint.cs

@@ -0,0 +1,32 @@
+namespace SatelliteProvider;
+
+public class GeoPoint
+{
+    const double PRECISION_TOLERANCE = 0.00005;
+    public double Lat { get; }
+    public double Lon { get; }
+
+    public GeoPoint() { }
+
+    public GeoPoint(double lat, double lon)
+    {
+        Lat = lat;
+        Lon = lon;
+    }
+
+    public override string ToString() => $"{Lat:F4}, {Lon:F4}";
+
+    public override bool Equals(object? obj)
+    {
+        if (obj is not GeoPoint point) return false;
+        return ReferenceEquals(this, obj) || Equals(point);
+    }
+
+    private bool Equals(GeoPoint point) =>
+        Math.Abs(Lat - point.Lat) < PRECISION_TOLERANCE && Math.Abs(Lon - point.Lon) < PRECISION_TOLERANCE;
+
+    public override int GetHashCode() => HashCode.Combine(Lat, Lon);
+
+    public static bool operator ==(GeoPoint left, GeoPoint right) => Equals(left, right);
+    public static bool operator !=(GeoPoint left, GeoPoint right) => !Equals(left, right);
+}