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Keep metadata of sample datasets in the xarray objects #184

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merged 5 commits into from Apr 7, 2021
Merged

Keep metadata of sample datasets in the xarray objects #184

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daab1c1
Missing attributes copied from original xarray before cast
nshea3 Aug 3, 2020
3008109
Added tests to check that grid.attrs is not empty
nshea3 Aug 3, 2020
a2e58ce
attrs copied to dict object, updated test_sample_data to test specifi…
nshea3 Aug 11, 2020
6cc2edf
Update comment lines
santisoler Aug 18, 2020
61c088e
Merge branch 'master' into ICGEM-missing-attr
santisoler Mar 29, 2021
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15 changes: 12 additions & 3 deletions harmonica/datasets/sample_data.py
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Expand Up @@ -64,7 +64,10 @@ def fetch_geoid_earth():

"""
fname = REGISTRY.fetch("geoid-earth-0.5deg.nc.xz", processor=pooch.Decompress())
data = xr.open_dataset(fname, engine="scipy").astype("float64")
data = xr.open_dataset(fname, engine="scipy")
attrs = data.attrs.copy()
data = data.astype("float64")
data.attrs = attrs
return data


Expand Down Expand Up @@ -94,7 +97,10 @@ def fetch_gravity_earth():
fname = REGISTRY.fetch("gravity-earth-0.5deg.nc.xz", processor=pooch.Decompress())
# The heights are stored as ints and data as float32 to save space on the
# data file. Cast them to float64 to avoid integer division errors.
data = xr.open_dataset(fname, engine="scipy").astype("float64")
data = xr.open_dataset(fname, engine="scipy")
attrs = data.attrs.copy()
data = data.astype("float64")
data.attrs = attrs
return data


Expand Down Expand Up @@ -125,7 +131,10 @@ def fetch_topography_earth():
fname = REGISTRY.fetch("etopo1-0.5deg.nc.xz", processor=pooch.Decompress())
# The data are stored as int16 to save disk space. Cast them to floats to
# avoid integer division problems when processing.
data = xr.open_dataset(fname, engine="scipy").astype("float64")
data = xr.open_dataset(fname, engine="scipy")
attrs = data.attrs.copy()
data = data.astype("float64")
data.attrs = attrs
return data


Expand Down
14 changes: 14 additions & 0 deletions harmonica/tests/test_sample_data.py
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Expand Up @@ -30,6 +30,11 @@ def test_geoid_earth():
assert grid.geoid.shape == (361, 721)
npt.assert_allclose(grid.geoid.min(), -106.257344)
npt.assert_allclose(grid.geoid.max(), 84.722744)
assert grid.attrs
assert grid.attrs.get("refsysname") == "WGS84"
assert grid.attrs.get("max_used_degree") == "1277"
assert grid.attrs.get("tide_system") == "tide_free"
assert grid.attrs.get("modelname") == "EIGEN-6C4"


def test_gravity_earth():
Expand All @@ -40,6 +45,11 @@ def test_gravity_earth():
npt.assert_allclose(grid.gravity.min(), 9.7476403e05)
assert grid.height_over_ell.shape == (361, 721)
npt.assert_allclose(grid.height_over_ell, 10000)
assert grid.attrs
assert grid.attrs.get("refsysname") == "WGS84"
assert grid.attrs.get("max_used_degree") == "1277"
assert grid.attrs.get("tide_system") == "tide_free"
assert grid.attrs.get("modelname") == "EIGEN-6C4"


def test_topography_earth():
Expand All @@ -48,6 +58,10 @@ def test_topography_earth():
assert grid.topography.shape == (361, 721)
npt.assert_allclose(grid.topography.max(), 5651, atol=1)
npt.assert_allclose(grid.topography.min(), -8409, atol=1)
assert grid.attrs
assert grid.attrs.get("refsysname") == "WGS84"
assert grid.attrs.get("max_used_degree") == "1277"
assert grid.attrs.get("modelname") == "etopo1-2250"


def test_britain_magnetic():
Expand Down