Refactor GF3 L1A to L2 pipeline

tests/fixtures/sample.meta.xml

@@ -0,0 +1,8 @@
+<root>
+  <QualifyValue>
+    <HH>1.0</HH><HV>2.0</HV><VH>NULL</VH><VV>4.0</VV>
+  </QualifyValue>
+  <CalibrationConst>
+    <HH>10.0</HH><HV>20.0</HV><VH>30.0</VH><VV>40.0</VV>
+  </CalibrationConst>
+</root>

tests/fixtures/sample.rpb

@@ -0,0 +1,16 @@
+errBias = -1;
+errRand = -1;
+lineOffset = 10;
+sampOffset = 20;
+latOffset = 30;
+longOffset = 40;
+heightOffset = 50;
+lineScale = 60;
+sampScale = 70;
+latScale = 80;
+longScale = 90;
+heightScale = 100;
+lineNumCoef = (1, 2, 3);
+lineDenCoef = (4, 5, 6);
+sampNumCoef = (7, 8, 9);
+sampDenCoef = (10, 11, 12);

tests/test_metadata.py

@@ -0,0 +1,19 @@
+import math
+import unittest
+from pathlib import Path
+
+from gf3_l1a2l2.metadata import read_calibration_metadata
+
+
+class MetadataTests(unittest.TestCase):
+    def test_reads_named_calibration_values(self):
+        path = Path(__file__).parent / "fixtures" / "sample.meta.xml"
+        metadata = read_calibration_metadata(path)
+
+        self.assertEqual(metadata.for_polarization("HH").qualify_value, 1.0)
+        self.assertEqual(metadata.for_polarization("HV").calibration_const, 20.0)
+        self.assertTrue(math.isnan(metadata.for_polarization("VH").qualify_value))
+
+
+if __name__ == "__main__":
+    unittest.main()

tests/test_rpc.py

@@ -0,0 +1,18 @@
+import unittest
+from pathlib import Path
+
+from gf3_l1a2l2.rpc import read_rpc_metadata
+
+
+class RpcTests(unittest.TestCase):
+    def test_reads_rpc_metadata(self):
+        path = Path(__file__).parent / "fixtures" / "sample.rpb"
+        metadata = read_rpc_metadata(path)
+
+        self.assertEqual(metadata["ERR_BIAS"], "-1")
+        self.assertEqual(metadata["LINE_OFF"], "10")
+        self.assertEqual(metadata["LINE_NUM_COEFF"], "1 2 3")
+
+
+if __name__ == "__main__":
+    unittest.main()