diff --git a/etc/adjusted/BOU202005adj.min b/etc/adjusted/BOU202005adj.min
new file mode 100644
index 0000000000000000000000000000000000000000..55f8fcc64580668ad815ae8706c1628cbbea0285
--- /dev/null
+++ b/etc/adjusted/BOU202005adj.min
@@ -0,0 +1,81 @@
+ Format IAGA-2002 |
+ Source of Data United States Geological Survey (USGS) |
+ Station Name Boulder |
+ IAGA CODE BOU |
+ Geodetic Latitude 40.137 |
+ Geodetic Longitude 254.763 |
+ Elevation 1682 |
+ Reported HENULNUL |
+ Sensor Orientation HDZF |
+ Digital Sampling 0.01 second |
+ Data Interval Type filtered 1-minute (00:15-01:45) |
+ Data Type adjusted |
+ # Vector 1-minute values are computed from 1-second values using |
+ # the INTERMAGNET gaussian filter centered on the minute. Scalar |
+ # 1-minute values are computed from 1-second values using the |
+ # INTERMAGNET gaussian filter centered on the minute. |
+ # CONDITIONS OF USE: The Conditions of Use for data provided |
+ # through INTERMAGNET and acknowledgement templates can be found at |
+ # www.intermagnet.org |
+DATE TIME DOY BOUH BOUE BOUNUL BOUNUL |
+2020-05-20 16:15:00.000 141 -20799.04 80.92 99999.00 99999.00
+2020-05-20 16:16:00.000 141 -20798.26 79.97 99999.00 99999.00
+2020-05-20 16:17:00.000 141 -20799.43 81.22 99999.00 99999.00
+2020-05-20 16:18:00.000 141 -20799.30 81.21 99999.00 99999.00
+2020-05-20 16:19:00.000 141 -20798.46 81.12 99999.00 99999.00
+2020-05-20 16:20:00.000 141 -20798.42 80.66 99999.00 99999.00
+2020-05-20 16:21:00.000 141 -20798.46 80.82 99999.00 99999.00
+2020-05-20 16:22:00.000 141 -20799.44 82.26 99999.00 99999.00
+2020-05-20 16:23:00.000 141 -20799.77 83.04 99999.00 99999.00
+2020-05-20 16:24:00.000 141 -20799.92 83.61 99999.00 99999.00
+2020-05-20 16:25:00.000 141 -20799.86 84.01 99999.00 99999.00
+2020-05-20 16:26:00.000 141 -20800.45 84.89 99999.00 99999.00
+2020-05-20 16:27:00.000 141 -20800.19 85.06 99999.00 99999.00
+2020-05-20 16:28:00.000 141 -20799.51 84.19 99999.00 99999.00
+2020-05-20 16:29:00.000 141 -20800.04 84.43 99999.00 99999.00
+2020-05-20 16:30:00.000 141 -20800.35 85.42 99999.00 99999.00
+2020-05-20 16:31:00.000 141 -20801.59 86.82 99999.00 99999.00
+2020-05-20 16:32:00.000 141 -20800.09 85.61 99999.00 99999.00
+2020-05-20 16:33:00.000 141 -20799.88 85.30 99999.00 99999.00
+2020-05-20 16:34:00.000 141 -20799.63 85.22 99999.00 99999.00
+2020-05-20 16:35:00.000 141 -20800.31 86.19 99999.00 99999.00
+2020-05-20 16:36:00.000 141 -20800.10 86.61 99999.00 99999.00
+2020-05-20 16:37:00.000 141 -20800.24 87.08 99999.00 99999.00
+2020-05-20 16:38:00.000 141 -20800.48 87.37 99999.00 99999.00
+2020-05-20 16:39:00.000 141 -20800.11 87.48 99999.00 99999.00
+2020-05-20 16:40:00.000 141 -20800.37 87.77 99999.00 99999.00
+2020-05-20 16:41:00.000 141 -20800.28 88.43 99999.00 99999.00
+2020-05-20 16:42:00.000 141 -20799.94 88.16 99999.00 99999.00
+2020-05-20 16:43:00.000 141 -20799.84 88.41 99999.00 99999.00
+2020-05-20 16:44:00.000 141 -20799.97 88.84 99999.00 99999.00
+2020-05-20 16:45:00.000 141 -20799.91 89.16 99999.00 99999.00
+2020-05-20 16:46:00.000 141 -20799.76 90.02 99999.00 99999.00
+2020-05-20 16:47:00.000 141 -20798.99 89.88 99999.00 99999.00
+2020-05-20 16:48:00.000 141 -20799.15 90.00 99999.00 99999.00
+2020-05-20 16:49:00.000 141 -20799.12 90.57 99999.00 99999.00
+2020-05-20 16:50:00.000 141 -20799.31 90.57 99999.00 99999.00
+2020-05-20 16:51:00.000 141 -20799.88 91.49 99999.00 99999.00
+2020-05-20 16:52:00.000 141 -20799.70 91.47 99999.00 99999.00
+2020-05-20 16:53:00.000 141 -20799.84 92.18 99999.00 99999.00
+2020-05-20 16:54:00.000 141 -20799.93 92.25 99999.00 99999.00
+2020-05-20 16:55:00.000 141 -20799.19 92.03 99999.00 99999.00
+2020-05-20 16:56:00.000 141 -20799.36 92.33 99999.00 99999.00
+2020-05-20 16:57:00.000 141 -20800.01 93.36 99999.00 99999.00
+2020-05-20 16:58:00.000 141 -20799.97 93.46 99999.00 99999.00
+2020-05-20 16:59:00.000 141 -20800.05 93.75 99999.00 99999.00
+2020-05-20 17:00:00.000 141 -20799.75 93.79 99999.00 99999.00
+2020-05-20 17:01:00.000 141 -20800.12 94.57 99999.00 99999.00
+2020-05-20 17:02:00.000 141 -20799.69 95.16 99999.00 99999.00
+2020-05-20 17:03:00.000 141 -20799.40 94.88 99999.00 99999.00
+2020-05-20 17:04:00.000 141 -20799.78 95.32 99999.00 99999.00
+2020-05-20 17:05:00.000 141 -20800.16 96.23 99999.00 99999.00
+2020-05-20 17:06:00.000 141 -20799.45 96.29 99999.00 99999.00
+2020-05-20 17:07:00.000 141 -20799.44 96.15 99999.00 99999.00
+2020-05-20 17:08:00.000 141 -20799.77 97.14 99999.00 99999.00
+2020-05-20 17:09:00.000 141 -20799.62 97.22 99999.00 99999.00
+2020-05-20 17:10:00.000 141 -20799.90 97.87 99999.00 99999.00
+2020-05-20 17:11:00.000 141 -20799.94 98.16 99999.00 99999.00
+2020-05-20 17:12:00.000 141 -20799.30 98.11 99999.00 99999.00
+2020-05-20 17:13:00.000 141 -20799.43 98.60 99999.00 99999.00
+2020-05-20 17:14:00.000 141 -20799.54 99.03 99999.00 99999.00
+2020-05-20 17:15:00.000 141 99999.00 99999.00 99999.00 99999.00
diff --git a/test/algorithm_test/AdjustedAlgorithm_test.py b/test/algorithm_test/AdjustedAlgorithm_test.py
index a57947d7a0221314bdb1b795a9c2dcc54bde6514..faffec3a9ba0522fb33cee08590e20ffda1b40ce 100644
--- a/test/algorithm_test/AdjustedAlgorithm_test.py
+++ b/test/algorithm_test/AdjustedAlgorithm_test.py
@@ -16,7 +16,7 @@ def test_construct():
assert_equal(a.pier_correction, -22)
-def test_process():
+def test_process_XYZF():
"""algorithm_test.AdjustedAlgorithm_test.test_process()
Check adjusted data processing versus files generated from
@@ -54,3 +54,43 @@ def test_process():
assert_almost_equal(y.data, y_adj.data, 2)
assert_almost_equal(z.data, z_adj.data, 2)
assert_almost_equal(f.data, f_adj.data, 2)
+
+
+def test_process_reverse_polarity():
+ """algorithm_test.AdjustedAlgorithm_test.test_process()
+
+ Check adjusted data processing versus files generated from
+ original script. Tests reverse polarity martix.
+ """
+ matrix = None
+ pier_correction = None
+ # load adjusted data transform matrix and pier correction
+ a = adj(
+ matrix,
+ pier_correction,
+ "etc/adjusted/adjbou_state_HE_.json",
+ inchannels=["H", "E"],
+ outchannels=["H", "E"],
+ )
+
+ # load boulder May 20 files from /etc/ directory
+ he_iaga2002_file = open("etc/adjusted/BOU202005vmin.min")
+ he_iaga2002_string = he_iaga2002_file.read()
+ he_inv_iaga2002_file = open("etc/adjusted/BOU202005adj.min")
+ he_inv_iaga2002_string = he_inv_iaga2002_file.read()
+ factory = i2.IAGA2002Factory()
+ he = factory.parse_string(he_iaga2002_string)
+ he_inv = factory.parse_string(he_inv_iaga2002_string)
+
+ # process hezf (raw) channels with loaded transform
+ adj_bou = a.process(he)
+
+ # unpack channels from loaded adjusted data file
+ h = he_inv.select(channel="H")[0]
+ e = he_inv.select(channel="E")[0]
+ # unpack channels from adjusted processing of raw data
+ h_adj = adj_bou.select(channel="H")[0]
+ e_adj = adj_bou.select(channel="E")[0]
+
+ assert_almost_equal(h.data, h_adj.data, 2)
+ assert_almost_equal(e.data, e_adj.data, 2)