diff --git a/Obj2Tiles/Options.cs b/Obj2Tiles/Options.cs
index 18dfc6b..afa4c9e 100644
--- a/Obj2Tiles/Options.cs
+++ b/Obj2Tiles/Options.cs
@@ -46,6 +46,9 @@ public sealed class Options
     
     [Option("keep-intermediate", Required = false, HelpText = "Keeps the intermediate files (do not cleanup)", Default = false)]
     public bool KeepIntermediateFiles { get; set; }
+
+    [Option('t',"yuptozup", Required = false, HelpText = "Convert the upward Y-axis to the upward Z-axis, which is used in some situations where the upward axis may be the Y-axis or the Z-axis after the obj is exported.", Default = true)]
+    public bool YUpToZUp { get; set; }
 }
 
 public enum Stage
diff --git a/Obj2Tiles/Program.cs b/Obj2Tiles/Program.cs
index eb3d616..9ee33f1 100644
--- a/Obj2Tiles/Program.cs
+++ b/Obj2Tiles/Program.cs
@@ -34,13 +34,13 @@ private static async Task Run(Options opts)
 
             opts.Output = Path.GetFullPath(opts.Output);
             opts.Input = Path.GetFullPath(opts.Input);
-            
+
             Directory.CreateDirectory(opts.Output);
 
             var pipelineId = Guid.NewGuid().ToString();
             var sw = new Stopwatch();
             var swg = Stopwatch.StartNew();
-            
+
             Func<string, string> createTempFolder = opts.UseSystemTempFolder
                 ? s => CreateTempFolder(s, Path.GetTempPath())
                 : s => CreateTempFolder(s, Path.Combine(opts.Output, ".temp"));
@@ -50,7 +50,7 @@ private static async Task Run(Options opts)
 
             try
             {
-               
+
                 destFolderDecimation = opts.StopAt == Stage.Decimation
                     ? opts.Output
                     : createTempFolder($"{pipelineId}-obj2tiles-decimation");
@@ -82,7 +82,7 @@ private static async Task Run(Options opts)
                     return;
 
                 var gpsCoords = opts.Latitude != null && opts.Longitude != null
-                    ? new GpsCoords(opts.Latitude.Value, opts.Longitude.Value, opts.Altitude, opts.Scale)
+                    ? new GpsCoords(opts.Latitude.Value, opts.Longitude.Value, opts.Altitude, opts.Scale, opts.YUpToZUp)
                     : null;
 
                 Console.WriteLine();
@@ -114,7 +114,7 @@ private static async Task Run(Options opts)
                 {
                     Console.WriteLine(
                         $" ?> Skipping cleanup, intermediate files are in '{tmpFolder}' with pipeline id '{pipelineId}'");
-                    
+
                     Console.WriteLine(" ?> You should delete this folder manually, it is only for debugging purposes");
                 }
                 else
@@ -137,38 +137,38 @@ private static async Task Run(Options opts)
         }
 
         private static bool CheckOptions(Options opts)
-       {
+        {
 
             if (string.IsNullOrWhiteSpace(opts.Input))
             {
                 Console.WriteLine(" !> Input file is required");
                 return false;
             }
-            
+
             if (!File.Exists(opts.Input))
             {
                 Console.WriteLine(" !> Input file does not exist");
                 return false;
             }
-            
+
             if (string.IsNullOrWhiteSpace(opts.Output))
             {
                 Console.WriteLine(" !> Output folder is required");
                 return false;
             }
-            
+
             if (opts.LODs < 1)
             {
                 Console.WriteLine(" !> LODs must be at least 1");
                 return false;
             }
-            
+
             if (opts.Divisions < 0)
             {
                 Console.WriteLine(" !> Divisions must be non-negative");
                 return false;
             }
-            
+
             return true;
         }
 
diff --git a/Obj2Tiles/Stages/Model/GpsCoords.cs b/Obj2Tiles/Stages/Model/GpsCoords.cs
index 3713565..a7a493d 100644
--- a/Obj2Tiles/Stages/Model/GpsCoords.cs
+++ b/Obj2Tiles/Stages/Model/GpsCoords.cs
@@ -6,13 +6,14 @@ public class GpsCoords
     public double Longitude { get; set; }
     public double Altitude { get; set; }
     public double Scale { get; set; }
-
-    public GpsCoords(double latitude, double longitude, double altitude, double scale)
+    public bool YUpToZUp { get; set; }
+    public GpsCoords(double latitude, double longitude, double altitude, double scale, bool yUpToZUp)
     {
         Latitude = latitude;
         Longitude = longitude;
         Altitude = altitude;
         Scale = scale;
+        YUpToZUp = yUpToZUp;
     }
 
     public GpsCoords()
@@ -21,6 +22,7 @@ public GpsCoords()
         Longitude = 0;
         Altitude = 0;
         Scale = 1;
+        YUpToZUp = true;
     }
 
     public double[] ToEcefTransform()
@@ -30,8 +32,8 @@ public double[] ToEcefTransform()
         var lon = Longitude * Math.PI / 180;
         var alt = Altitude;
 
-        var a = 6378137.0/s;
-        var b = 6356752.3142/s;
+        var a = 6378137.0 / s;
+        var b = 6356752.3142 / s;
         var f = (a - b) / a;
 
         var eSq = 2 * f - f * f;
@@ -75,8 +77,11 @@ public double[] ToEcefTransform()
             0, 0, 0, 1
         };
 
-        var mult = MultiplyMatrix(res, rot);
-
+        var mult = res;
+        if (YUpToZUp)
+        {
+            mult = MultiplyMatrix(res, rot);
+        }
         return MultiplyMatrix(ConvertToColumnMajorOrder(mult), scale);
     }
 
@@ -86,7 +91,7 @@ public double[] ToEcefTransform()
         0, -1, 0, 0,
         0, 0, 0, 1
     };
-    
+
     public static double[] ConvertToColumnMajorOrder(double[] m)
     {
         var res = new double[16];