1 files changed, 56 insertions, 0 deletions
diff --git a/conductor/conductor/solver/utils/utils.py b/conductor/conductor/solver/utils/utils.py
new file mode 100755
index 0000000..5cec51f
--- /dev/null
+++ b/conductor/conductor/solver/utils/utils.py
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+#!/usr/bin/env python
+#
+# -------------------------------------------------------------------------
+#   Copyright (c) 2015-2017 AT&T Intellectual Property
+#
+#   Licensed under the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+#   You may obtain a copy of the License at
+#
+#       http://www.apache.org/licenses/LICENSE-2.0
+#
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS,
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#   See the License for the specific language governing permissions and
+#   limitations under the License.
+#
+# -------------------------------------------------------------------------
+#
+
+
+import math
+
+
+def compute_air_distance(_src, _dst):
+    """Compute Air Distance
+
+    based on latitude and longitude
+    input: a pair of (lat, lon)s
+    output: air distance as km
+    """
+    distance = 0.0
+
+    if _src == _dst:
+        return distance
+
+    radius = 6371.0  # km
+
+    dlat = math.radians(_dst[0] - _src[0])
+    dlon = math.radians(_dst[1] - _src[1])
+    a = math.sin(dlat / 2.0) * math.sin(dlat / 2.0) + \
+        math.cos(math.radians(_src[0])) * \
+        math.cos(math.radians(_dst[0])) * \
+        math.sin(dlon / 2.0) * math.sin(dlon / 2.0)
+    c = 2.0 * math.atan2(math.sqrt(a), math.sqrt(1.0 - a))
+    distance = radius * c
+
+    return distance
+
+
+def convert_km_to_miles(_km):
+    return _km * 0.621371
+
+
+def convert_miles_to_km(_miles):
+    return _miles / 0.621371