diff --git a/api/__init__.py b/api/__init__.py
index 5bf55a3..8f0ba39 100644
--- a/api/__init__.py
+++ b/api/__init__.py
@@ -117,7 +117,7 @@ from .s23_options_util import OPTION_V3_QUALITY_UNITS_HRS, OPTION_V3_QUALITY_UNI
 from .s23_options_util import get_option_v3_schema, get_option_v3
 from .batch_api import set_option_v3_ex
 
-from .s24_coordinates import get_node_coord
+from .s24_coordinates import get_node_coord, get_nodes_in_extent, get_links_in_extent
 
 from .s25_vertices import get_vertex_schema, get_vertex, set_vertex, add_vertex, delete_vertex
 from .s25_vertices import get_all_vertex_links, get_all_vertices
diff --git a/api/s24_coordinates.py b/api/s24_coordinates.py
index 6b9e4ac..ba0fa21 100644
--- a/api/s24_coordinates.py
+++ b/api/s24_coordinates.py
@@ -1,5 +1,5 @@
 from .database import *
-
+from .s0_base import get_link_nodes
 
 def sql_update_coord(node: str, x: float, y: float) -> str:
     coord = f"st_geomfromtext('point({x} {y})')"
@@ -29,6 +29,7 @@ def get_node_coord(name: str, node: str) -> dict[str, float]:
 
 # DingZQ 2025-01-03, get nodes in extent
 # return node id list
+# node_id:junction:x:y
 def get_nodes_in_extent(name: str, x1: float, y1: float, x2: float, y2: float) -> list[str]:
     nodes = []
     objs = read_all(name, 'select node, st_astext(coord) as coord_geom from coordinates')
@@ -38,9 +39,28 @@ def get_nodes_in_extent(name: str, x1: float, y1: float, x2: float, y2: float) -
         x = coord['x']
         y = coord['y']
         if x1 <= x <= x2 and y1 <= y <= y2:
-            nodes.append(node_id)
+            nodes.append(f"{node_id}:{x}:{y}")
     return nodes
 
+# DingZQ 2025-01-03, get links in extent
+# return link id list   
+# link_id:pipe:node_id1:node_id2   
+def get_links_in_extent(name: str, x1: float, y1: float, x2: float, y2: float) -> list[str]:
+    node_ids = set([s.split(':')[0] for s in get_nodes_in_extent(name, x1, y1, x2, y2)])
+
+    all_link_ids = []
+    with conn[name].cursor(row_factory=dict_row) as cur:
+        cur.execute(f"select id from pipes where order by id")
+        for record in cur:
+            all_link_ids.append(record['id'])
+
+    links = []
+    for link_id in all_link_ids:
+        nodes = get_link_nodes(name, link_id)
+        if nodes[0] in node_ids and nodes[1] in node_ids:
+            links.append(f"{link_id}:pipe:{nodes[0]}:{nodes[1]}")
+    return links
+
 
 def node_has_coord(name: str, node: str) -> bool:
     return try_read(name, f"select node from coordinates where node = '{node}'") != None