Add GPSHPositioningError exif tag

src/ImageSharp/Metadata/Profiles/Exif/Tags/ExifTag.Rational.cs

@@ -165,4 +165,9 @@ public abstract partial class ExifTag
     /// Gets the GPSDestDistance exif tag.
     /// </summary>
     public static ExifTag<Rational> GPSDestDistance { get; } = new ExifTag<Rational>(ExifTagValue.GPSDestDistance);
+
+    /// <summary>
+    /// Gets the GPSHPositioningError exif tag.
+    /// </summary>
+    public static ExifTag<Rational> GPSHPositioningError { get; } = new ExifTag<Rational>(ExifTagValue.GPSHPositioningError);
 }

src/ImageSharp/Metadata/Profiles/Exif/Tags/ExifTagValue.cs

@@ -1691,6 +1691,11 @@ internal enum ExifTagValue
     /// </summary>
     GPSDifferential = 0x001E,
 
+    /// <summary>
+    /// GPSHPositioningError
+    /// </summary>
+    GPSHPositioningError = 0x001F,
+
     /// <summary>
     /// Used in the Oce scanning process.
     /// Identifies the scanticket used in the scanning process.

src/ImageSharp/Metadata/Profiles/Exif/Values/ExifValues.cs

@@ -241,6 +241,8 @@ internal static partial class ExifValues
                 return new ExifRational(ExifTag.GPSDestBearing);
             case ExifTagValue.GPSDestDistance:
                 return new ExifRational(ExifTag.GPSDestDistance);
+            case ExifTagValue.GPSHPositioningError:
+                return new ExifRational(ExifTag.GPSHPositioningError);
 
             case ExifTagValue.WhitePoint:
                 return new ExifRationalArray(ExifTag.WhitePoint);

tests/ImageSharp.Tests/Metadata/Profiles/Exif/Values/ExifValuesTests.cs

@@ -128,6 +128,7 @@ public class ExifValuesTests
         { ExifTag.GPSImgDirection },
         { ExifTag.GPSDestBearing },
         { ExifTag.GPSDestDistance },
+        { ExifTag.GPSHPositioningError },
     };
 
     public static TheoryData<ExifTag> RationalArrayTags => new TheoryData<ExifTag>