Merge pull request #449 from opendatacube/alos_rvi_bandutil

New band util function to handle radar vegetation index.

datacube_ows/band_utils.py

@@ -132,3 +132,13 @@ def single_band_offset_log(data, band, scale=1.0, scale_from=None, scale_to=None
     if scale_from:
         return scale_data(unscaled, scale_from, scale_to)
     return unscaled
+
+
+def radar_vegetation_index(data, band_hv, band_hh, band_mapper=None):
+    if band_mapper:
+        band_hv = band_mapper(band_hv)
+        band_hh = band_mapper(band_hh)
+    hv_sq = data[band_hv]*data[band_hv]
+    hh_sq = data[band_hh]*data[band_hh]
+    return (hv_sq * 4.0) / (hh_sq + hv_sq)
+

datacube_ows/cfg_parser.py

@@ -0,0 +1,54 @@
+#!/usr/bin/env python3
+
+import click
+
+from datacube_ows import __version__
+from datacube_ows.ows_configuration import read_config, OWSConfig, ConfigException
+from datacube import Datacube
+
+@click.command()
+@click.argument("paths", nargs=-1)
+@click.option("--version", is_flag=True, default=False, help="Show OWS version number and exit")
+@click.option("-p", "--parse-only", is_flag=True, default=False, help="Only parse the syntax of the config file - do not validate against database")
+def main(version, parse_only, paths):
+    #layers, blocking,
+    #     merge_only, summary,
+    #     schema, views, role, version,
+    #     product, multiproduct, calculate_extent):
+    """Test configuration files
+
+    Valid invocations:
+
+    Uses the DATACUBE_OWS_CFG environment variable to find the OWS config file.
+    """
+    # --version
+    if version:
+        print("Open Data Cube Open Web Services (datacube-ows) version",
+              __version__
+               )
+        return 0
+
+    if not paths:
+        if parse_path(None, parse_only):
+            return 0
+        else:
+            return 1
+    all_ok = True
+    for path in paths:
+        if not parse_path(path, parse_only):
+            all_ok = False
+
+
+    if all_ok:
+        return 1
+    return 0
+
+def parse_path(path, parse_only):
+    try:
+        raw_cfg = read_config(path)
+        cfg = OWSConfig(refresh=True, cfg=raw_cfg)
+        if not parse_only:
+            with Datacube() as dc:
+                cfg.make_ready(dc)
+    except ConfigException as e:
+        print("Config exception for path", str(e))

tests/test_band_utils.py

@@ -17,6 +17,7 @@
     multi_date_delta,
     single_band_offset_log,
     single_band_arcsec,
+    radar_vegetation_index
 )
 from datacube_ows.ows_configuration import BandIndex, OWSProductLayer
 
@@ -122,3 +123,8 @@ def test_single_band_arcsec(band_mapper):
     assert not single_band_arcsec(TEST_XARR, "b1", scale_from=[0.0, 0.8]) is None
     assert not single_band_arcsec(TEST_XARR, "b1", scale_from=[0.0, 0.8], scale_to=[0, 1024]) is None
     assert not single_band_arcsec(TEST_XARR, "b1", band_mapper=band_mapper) is None
+
+
+def test_rvi(band_mapper):
+    assert not radar_vegetation_index(TEST_XARR, "b1", "b2") is None
+    assert not radar_vegetation_index(TEST_XARR, "b1", "b2", band_mapper=band_mapper) is None