fix manhattan distance to sum of abs (#309)

calexat-123 · web-flow · commit 9b7f44dc1afc · 2021-05-04T15:42:37.000+07:00
diff --git a/xrspatial/proximity.py b/xrspatial/proximity.py
@@ -114,7 +114,7 @@ def manhattan_distance(x1: float, x2: float,
 
     x = x1 - x2
     y = y1 - y2
-    return x * x + y * y
+    return abs(x) + abs(y)
 
 
 @njit(nogil=True)
