diff --git a/test/test_losreader.py b/test/test_losreader.py
index 3a2b3fb92..fdca1e7c6 100644
--- a/test/test_losreader.py
+++ b/test/test_losreader.py
@@ -192,25 +192,42 @@ def test_los_to_lv_3c():
 
 def test_los_to_lv_4():
     assert np.allclose(
-        inc_hd_to_enu(35, 0),
-        np.array([0, np.sin(np.radians(35)), np.cos(np.radians(35))])
+        inc_hd_to_enu(90, 0),
+        np.array([0, 1, 0])
     )
 
 
 def test_los_to_lv_5():
     assert np.allclose(
-        inc_hd_to_enu(35, 180),
-        np.array([0, -np.sin(np.radians(35)), np.cos(np.radians(35))])
+        inc_hd_to_enu(90, 90),
+        np.array([1, 0, 0])
     )
 
-
 def test_los_to_lv_6():
     assert np.allclose(
-        inc_hd_to_enu(35, 90),
-        np.array([-np.sin(np.radians(35)), 0, np.cos(np.radians(35))])
+        inc_hd_to_enu(90, 180),
+        np.array([0, -1, 0])
     )
 
 
+def test_los_to_lv_7():
+    assert np.allclose(
+        inc_hd_to_enu(90, 270),
+        np.array([-1, 0, 0])
+    )
+
+def test_los_to_lv_8():
+    assert np.allclose(
+        inc_hd_to_enu(45, 90),
+        np.array([np.sqrt(2)/2, 0, np.sqrt(2)/2])
+    )
+
+def test_los_to_lv_9():
+    assert np.allclose(
+        inc_hd_to_enu(45, 180),
+        np.array([0, -np.sqrt(2)/2, np.sqrt(2)/2])
+    )
+
 def test_zenith_1():
     assert np.allclose(
         getZenithLookVecs(np.array([0]), np.array([0]), np.array([0])),
diff --git a/tools/RAiDER/losreader.py b/tools/RAiDER/losreader.py
index d0fbcfb26..bacd452dc 100644
--- a/tools/RAiDER/losreader.py
+++ b/tools/RAiDER/losreader.py
@@ -247,7 +247,7 @@ def inc_hd_to_enu(incidence, heading):
     if np.any(incidence < 0):
         raise ValueError('inc_hd_to_enu: Incidence angle cannot be less than 0')
 
-    east = sind(incidence) * cosd(heading + 90)
+    east = - sind(incidence) * cosd(heading + 90)
     north = sind(incidence) * sind(heading + 90)
     up = cosd(incidence)