diff --git a/dem.py b/dem.py
index 76be2c2..673dcec 100644
--- a/dem.py
+++ b/dem.py
@@ -104,7 +104,7 @@ class Dem:
             if self._tree_height > 0:
                 dm_msp.add_polyline2d(
                     [
-                        (x_axis[i] / 5, (center_elevation[i] + self._tree_height) * 2)
+                        (x_axis[i] / 5, ( np.max( (center_elevation[i],left_elevation[i],right_elevation[i])) + self._tree_height) * 2)
                         for i in range(len(center_elevation))
                     ]
                 )
@@ -130,7 +130,7 @@ class Dem:
                 z_file.write("0     ")
                 z_file.write("0     ")
                 z_file.write(f"{center_elevation[0]*2-50}")
-            # TODO:写平面文件
+            # 写平面文件
             plate_msp.add_polyline2d(
                 line_coordination[:, 0:2],
                 dxfattribs={"color": 1},
@@ -267,6 +267,7 @@ class Dem:
             #     + equation_c[2] * Yline
             #     + equation_c[3]
             # )
+            # 已经https://blog.csdn.net/jameschen9051/article/details/109469228中的公司
             point_z = (
                 lu_elevation[0]
                 * (