diff --git a/odm_preprocess.py b/odm_preprocess.py
index 835b428..cc07a99 100644
--- a/odm_preprocess.py
+++ b/odm_preprocess.py
@@ -185,6 +185,13 @@ class ImagePreprocessor:
         self.visualizer.visualize_filter_step(
             self.gps_points, previous_points, "3-Time Group Overlap")
 
+    def calculate_center_coordinates(self):
+        """计算剩余点的中心经纬度坐标"""
+        mean_lat = self.gps_points['lat'].mean()
+        mean_lon = self.gps_points['lon'].mean()
+        self.logger.info(f"区域中心坐标：纬度 {mean_lat:.6f}, 经度 {mean_lon:.6f}")
+        return mean_lat, mean_lon
+
     def filter_alternate_images(self):
         """按时间顺序隔一个删一个图像来降低密度"""
         previous_points = self.gps_points.copy()
@@ -258,13 +265,13 @@ class ImagePreprocessor:
         merger = MergeObj(self.config.output_dir)
         merger.merge_grid_obj(grid_points, translations)
 
-    def convert_obj(self, grid_points: Dict[tuple, pd.DataFrame]):
+    def convert_obj(self, grid_points: Dict[tuple, pd.DataFrame], center_lat: float, center_lon: float):
         """转换OBJ模型"""
         self.logger.info("开始转换OBJ模型")
-        converter = ConvertOBJ(self.config.output_dir)
+        converter = ConvertOBJ(self.config.output_dir, center_lat, center_lon)
         converter.convert_grid_obj(grid_points)
 
-    def post_process(self, successful_grid_points: Dict[tuple, pd.DataFrame], grid_points: Dict[tuple, pd.DataFrame], translations: Dict[tuple, tuple]):
+    def post_process(self, successful_grid_points: Dict[tuple, pd.DataFrame], grid_points: Dict[tuple, pd.DataFrame], translations: Dict[tuple, tuple], center_lat: float, center_lon: float):
         """后处理：合并或复制处理结果"""
         if len(successful_grid_points) < len(grid_points):
             self.logger.warning(
@@ -277,12 +284,12 @@ class ImagePreprocessor:
         elif self.config.mode == "三维模式":
             # self.merge_ply(successful_grid_points)
             # self.merge_obj(successful_grid_points, translations)
-            self.convert_obj(successful_grid_points)
+            self.convert_obj(successful_grid_points, center_lat, center_lon)
         else:
             self.merge_tif(successful_grid_points, self.config.produce_dem)
             # self.merge_ply(successful_grid_points)
             # self.merge_obj(successful_grid_points, translations)
-            self.convert_obj(successful_grid_points)
+            self.convert_obj(successful_grid_points, center_lat, center_lon)
 
     def process(self):
         """执行完整的预处理流程"""
@@ -291,6 +298,7 @@ class ImagePreprocessor:
             self.cluster()
             self.filter_isolated_points()
             self.filter_time_group_overlap()
+            center_lat, center_lon = self.calculate_center_coordinates()
             # self.filter_alternate_images()
             grid_points, translations = self.divide_grids()
             self.copy_images(grid_points)
@@ -300,7 +308,7 @@ class ImagePreprocessor:
                 grid_points, self.config.produce_dem)
 
             self.post_process(successful_grid_points,
-                              grid_points, translations)
+                              grid_points, translations, center_lat, center_lon)
 
         except Exception as e:
             self.logger.error(f"处理过程中发生错误: {str(e)}", exc_info=True)
diff --git a/post_pro/conv_obj.py b/post_pro/conv_obj.py
index 3480448..5f495fa 100644
--- a/post_pro/conv_obj.py
+++ b/post_pro/conv_obj.py
@@ -5,8 +5,10 @@ import shutil
 import logging
 
 class ConvertOBJ:
-    def __init__(self, output_dir: str):
+    def __init__(self, output_dir: str, center_lat: float, center_lon: float):
         self.output_dir = output_dir
+        self.center_lat = center_lat
+        self.center_lon = center_lon
         self.logger = logging.getLogger('UAV_Preprocess.ConvertOBJ')
         
     def convert_grid_obj(self, grid_points):
@@ -18,6 +20,9 @@ class ConvertOBJ:
             except Exception as e:
                 self.logger.error(f"网格 {grid_id} 转换失败: {str(e)}")
                 
+        # 在所有网格处理完成后创建总的metadata.xml
+        self._create_merged_metadata()
+        
     def _convert_single_grid(self, grid_id):
         """转换单个网格的OBJ文件"""
         # 1. 构建相关路径
@@ -51,28 +56,30 @@ class ConvertOBJ:
             ref_lla = json.load(f)
             
         # 4. 创建OSGB目录结构
-        osgb_dir = os.path.join(self.output_dir, "osgb", grid_name)
-        data_dir = os.path.join(osgb_dir, "Data")
-        tile_dir = os.path.join(data_dir, "Tile")
+        osgb_base_dir = os.path.join(self.output_dir, "osgb")
+        data_dir = os.path.join(osgb_base_dir, "Data")
+        tile_dir = os.path.join(data_dir, f"Tile_{grid_id[0]}_{grid_id[1]}")
         os.makedirs(tile_dir, exist_ok=True)
         
-        # 5. 创建metadata.xml
+        # 5. 复制OSGB文件
+        target_osgb = os.path.join(tile_dir, f"Tile_{grid_id[0]}_{grid_id[1]}.osgb")
+        shutil.copy2(output_osgb, target_osgb)
+        
+        self.logger.info(f"网格 {grid_id} 转换完成")
+
+    def _create_merged_metadata(self):
+        """创建合并后的metadata.xml文件"""
         metadata_content = f"""<?xml version="1.0" encoding="utf-8"?>
 <ModelMetadata version="1">
     <!--Spatial Reference System-->
     <SRS>EPSG:4326</SRS>
     <!--Origin in Spatial Reference System-->
-    <SRSOrigin>{ref_lla['longitude']},{ref_lla['latitude']},0.000000</SRSOrigin>
+    <SRSOrigin>{self.center_lon},{self.center_lat},0.000000</SRSOrigin>
     <Texture>
         <ColorSource>Visible</ColorSource>
     </Texture>
 </ModelMetadata>"""
         
-        metadata_file = os.path.join(osgb_dir, "metadata.xml")
+        metadata_file = os.path.join(self.output_dir, "osgb", "metadata.xml")
         with open(metadata_file, 'w', encoding='utf-8') as f:
             f.write(metadata_content)
-            
-        # 6. 复制OSGB文件
-        shutil.copy2(output_osgb, os.path.join(tile_dir, "Tile.osgb"))
-        
-        self.logger.info(f"网格 {grid_id} 转换完成")