L2SS-785: Add geohash

Add geohash positions in order to show the positions easier in Grafana.

tangostationcontrol/tangostationcontrol/test/beam/test_geo.py

@@ -70,3 +70,29 @@ class TestETRS_to_GEO(base.TestCase):
         LOFAR1_CS001_LBA_GEO = [52.911, 6.868]
 
         numpy.testing.assert_almost_equal(CS001_LBA_GEO, LOFAR1_CS001_LBA_GEO, decimal=3)
+
+class TestGEO_to_GEOHASH(base.TestCase):
+    def test_convert_single_coordinate(self):
+        """ Convert a single coordinate. """
+        GEO_coords = numpy.array([1.0, 1.0])
+        GEOHASH_coords = GEO_to_GEOHASH(GEO_coords)
+
+        self.assertEqual((1,), GEOHASH_coords.shape)
+
+    def test_convert_array(self):
+        """ Convert an array of coordinates. """
+        GEO_coords = numpy.array([ [1.0, 1.0], [2.0, 2.0], [3.0, 3.0] ])
+        GEOHASH_coords = GEO_to_GEOHASH(GEO_coords)
+
+        self.assertEqual((3,1), GEOHASH_coords.shape)
+
+    def test_CS001_LBA_regression(self):
+        """ Verify if the calculated CS001LBA phase center match fixed values, to detect changes in computation. """
+
+        CS001_LBA_GEO = [52.911, 6.868]
+
+        # Convert to GEO
+        CS001_LBA_GEOHASH = GEO_to_GEOHASH(numpy.array(CS001_LBA_GEO))
+
+        # verify against precomputed value
+        self.assertEqual('u1kvh21hgvrcpm28', CS001_LBA_GEOHASH)