From 0d398031fdc615cb98ece2644478219434126a72 Mon Sep 17 00:00:00 2001
From: Ieuan Walker <Ieuan.Walker@cardiff.gov.uk>
Date: Wed, 18 Feb 2026 13:01:43 +0000
Subject: [PATCH] Add FromLatitudeLongitude to EastingNorthing class

Introduced a static method to create EastingNorthing objects from latitude and longitude by converting WGS84 coordinates to OSGB36 and projecting to British National Grid. Added necessary using directives for GeoUK.Ellipsoids and GeoUK.Projections.
---
 GeoUK/Coordinates/EastingNorthing.cs | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/GeoUK/Coordinates/EastingNorthing.cs b/GeoUK/Coordinates/EastingNorthing.cs
index e229b7c..4eefbef 100644
--- a/GeoUK/Coordinates/EastingNorthing.cs
+++ b/GeoUK/Coordinates/EastingNorthing.cs
@@ -1,3 +1,6 @@
+using GeoUK.Ellipsoids;
+using GeoUK.Projections;
+
 namespace GeoUK.Coordinates
 {
     /// <summary>
@@ -62,5 +65,19 @@ public double DistanceTo(EastingNorthing toEastingNorthing)
             double deltaHeight = toEastingNorthing.Height - Height;
             return System.Math.Sqrt(horizontal * horizontal + deltaHeight * deltaHeight);
         }
+
+        /// <summary>
+        ///  Creates a <see cref="EastingNorthing"/> object from latitude and longitude coordinates.
+        /// </summary>
+        /// <param name="latitude"></param>
+        /// <param name="longitude"></param>
+        /// <returns></returns>
+        public static EastingNorthing FromLatitudeLongitude(double latitude, double longitude)
+        {
+            Cartesian cartesian = Convert.ToCartesian(new Wgs84(), new LatitudeLongitude(latitude, longitude));
+            Cartesian bngCartesian = Transform.Etrs89ToOsgb36(cartesian);
+
+            return Convert.ToEastingNorthing(new Airy1830(), new BritishNationalGrid(), bngCartesian);
+        }
     }
 }
\ No newline at end of file