diff --git a/utils/raw_to_cog.py b/utils/raw_to_cog.py
index 2179f56..eaa133f 100644
--- a/utils/raw_to_cog.py
+++ b/utils/raw_to_cog.py
@@ -8,7 +8,7 @@ COG (Cloud Optimized GeoTIFF) 是一种优化设计的 GeoTIFF 文件格式, 特
 
 -------------------------------------------------------------------------------
 Authors: CVEO Team
-Last Updated: 2026-01-08
+Last Updated: 2026-01-28
 ===============================================================================
 """
 
@@ -76,6 +76,8 @@ def tif_to_cog(
                 no_data = -32768
             elif output_type == gdal.GDT_Float32:
                 no_data = -9999
+            elif output_type == gdal.GDT_Byte:
+                no_data = None
             else:
                 no_data = np.nan
             logging.warning(f"原数据未设无效值, 现已设为: {no_data}")
@@ -113,8 +115,12 @@ def main(input_dir, file_name, output_path, output_type=gdal.GDT_Float32):
     input_path = input_dir / file_name
     output_path = output_dir / file_name
     # 关于无效值
-    # Float32 类型可以设为 -9999; 8bit 类型可以设为 0
-    tif_to_cog(str(input_path), str(output_path), output_type, no_data=-9999)
+    # Float32 类型可以设为 -9999
+    if output_type == gdal.GDT_Float32:
+        no_data = -9999
+    else:
+        no_data = np.nan
+    tif_to_cog(str(input_path), str(output_path), output_type, no_data=no_data)
 
 
 if __name__ == "__main__":