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# Licensed under a 3-clause BSD style license - see LICENSE.rst |
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import pytest |
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import numpy as np |
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from numpy.testing import assert_allclose |
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from astropy import units as u |
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from astropy.coordinates import SkyCoord, EarthLocation |
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from astropy.time import Time |
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from ...utils.testing import requires_data |
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from ...maps import WcsGeom, HpxGeom, MapAxis |
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from ...irf import Background3D |
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from ..background import make_map_background_irf |
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from ...data.pointing import FixedPointingInfo |
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pytest.importorskip("healpy") |
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@pytest.fixture(scope="session") |
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def fixed_pointing_info(): |
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filename = ( |
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"$GAMMAPY_DATA/cta-1dc/data/baseline/gps/gps_baseline_110380.fits" |
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) |
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return FixedPointingInfo.read(filename) |
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@pytest.fixture(scope="session") |
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def fixed_pointing_info_aligned(fixed_pointing_info): |
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# Create Fixed Pointing Info aligined between sky and horizon coordinates |
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# (removes rotation in FoV and results in predictable solid angles) |
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origin = SkyCoord( |
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0, 0, |
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unit='deg', frame='icrs', |
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location=EarthLocation(lat=90*u.deg, lon=0*u.deg), |
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obstime=Time('2000-9-21 12:00:00') |
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) |
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fpi = fixed_pointing_info |
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meta = fpi.meta.copy() |
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meta['RA_PNT'] = origin.icrs.ra |
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meta['DEC_PNT'] = origin.icrs.dec |
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meta['GEOLON'] = origin.location.lon |
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meta['GEOLAT'] = origin.location.lat |
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meta['ALTITUDE'] = origin.location.height |
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time_start = origin.obstime.datetime - fpi.time_ref.datetime |
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meta['TSTART'] = time_start.total_seconds() |
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meta['TSTOP'] = meta['TSTART'] + 60 |
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return FixedPointingInfo(meta) |
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@pytest.fixture(scope="session") |
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def bkg_3d(): |
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filename = ( |
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"$GAMMAPY_DATA/cta-1dc/caldb/data/cta/1dc/bcf/South_z20_50h/irf_file.fits" |
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) |
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return Background3D.read(filename, hdu="BACKGROUND") |
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def bkg_3d_custom(symmetry='constant'): |
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if symmetry == 'constant': |
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data = np.ones((2, 3, 3)) * u.Unit("s-1 MeV-1 sr-1") |
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elif symmetry == 'symmetric': |
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data = np.ones((2, 3, 3)) * u.Unit("s-1 MeV-1 sr-1") |
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data[:, 1, 1] *= 2 |
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elif symmetry == 'asymmetric': |
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data = np.indices((3, 3))[1] + 1 |
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data = np.stack(2 * [data]) * u.Unit("s-1 MeV-1 sr-1") |
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else: |
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raise ValueError("Unkown value for symmetry: {}".format(symmetry)) |
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energy = [0.1, 10, 1000] * u.TeV |
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fov_lon = [-3, -1, 1, 3] * u.deg |
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fov_lat = [-3, -1, 1, 3] * u.deg |
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return Background3D( |
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energy_lo=energy[:-1], |
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energy_hi=energy[1:], |
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fov_lon_lo=fov_lon[:-1], |
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fov_lon_hi=fov_lon[1:], |
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fov_lat_lo=fov_lat[:-1], |
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fov_lat_hi=fov_lat[1:], |
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data=data, |
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) |
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def make_map_background_irf_with_symmetry(fpi, symmetry='constant'): |
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axis = MapAxis.from_edges( |
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[0.1, 1, 10], name="energy", unit="TeV", interp="log" |
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) |
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return make_map_background_irf( |
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pointing=fpi, |
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ontime="42 s", |
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bkg=bkg_3d_custom(symmetry), |
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geom=WcsGeom.create( |
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npix=(3, 3), |
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binsz=4, |
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axes=[axis], |
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skydir=fpi.radec |
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), |
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) |
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def geom(map_type, ebounds, skydir): |
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axis = MapAxis.from_edges(ebounds, name="energy", unit="TeV", interp="log") |
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if map_type == "wcs": |
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return WcsGeom.create(npix=(4, 3), binsz=2, axes=[axis], skydir=skydir) |
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elif map_type == "hpx": |
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return HpxGeom(256, axes=[axis]) |
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else: |
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raise ValueError() |
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@requires_data("gammapy-data") |
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@pytest.mark.parametrize( |
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"pars", |
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[ |
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{ |
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"map_type": "wcs", |
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"ebounds": [0.1, 1, 10], |
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"shape": (2, 3, 4), |
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"sum": 940.167672, |
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}, |
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{ |
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"map_type": "wcs", |
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"ebounds": [0.1, 10], |
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"shape": (1, 3, 4), |
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"sum": 1019.495516, |
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}, |
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# TODO: make this work for HPX |
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# 'HpxGeom' object has no attribute 'separation' |
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# { |
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# 'geom': geom(map_type='hpx', ebounds=[0.1, 1, 10]), |
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# 'shape': '???', |
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# 'sum': '???', |
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# }, |
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], |
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) |
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def test_make_map_background_irf(bkg_3d, pars, fixed_pointing_info): |
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m = make_map_background_irf( |
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pointing=fixed_pointing_info, |
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ontime="42 s", |
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bkg=bkg_3d, |
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geom=geom( |
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map_type=pars['map_type'], |
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ebounds=pars['ebounds'], |
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skydir=fixed_pointing_info.radec |
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), |
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) |
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assert m.data.shape == pars["shape"] |
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assert m.unit == "" |
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assert_allclose(m.data.sum(), pars["sum"], rtol=1e-5) |
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def test_make_map_background_irf_constant(fixed_pointing_info_aligned): |
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m = make_map_background_irf_with_symmetry( |
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fpi=fixed_pointing_info_aligned, symmetry='constant' |
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) |
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for d in m.data: |
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assert_allclose(d[1, :], d[1, 0]) # Constant along lon |
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assert_allclose(d[0, 1], d[2, 1]) # Symmetric along lat |
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with pytest.raises(AssertionError): |
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# Not constant along lat due to changes in |
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# solid angle (great circle) |
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assert_allclose(d[:, 1], d[0, 1]) |
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def test_make_map_background_irf_sym(fixed_pointing_info_aligned): |
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m = make_map_background_irf_with_symmetry( |
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fpi=fixed_pointing_info_aligned, symmetry='symmetric' |
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) |
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for d in m.data: |
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assert_allclose(d[1, 0], d[1, 2], rtol=1e-4) # Symmetric along lon |
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assert_allclose(d[0, 1], d[2, 1], rtol=1e-4) # Symmetric along lat |
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def test_make_map_background_irf_asym(fixed_pointing_info_aligned): |
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m = make_map_background_irf_with_symmetry( |
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fpi=fixed_pointing_info_aligned, symmetry='asymmetric' |
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) |
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for d in m.data: |
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# TODO: |
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# Dimensions of skymap data are [energy, lat, lon] (and is |
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# representated as [lon, lat, energy] in the api, but the bkg irf |
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# dimensions are currently [energy, lon, lat] - Will be changed in |
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# the future (perhaps when IRFs use the skymaps class) |
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assert_allclose(d[1, 0], d[1, 2], rtol=1e-4) # Symmetric along lon |
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with pytest.raises(AssertionError): |
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assert_allclose(d[0, 1], d[2, 1], rtol=1e-4) # Symmetric along lat |
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assert_allclose(d[0, 1]*9, d[2, 1], rtol=1e-4) # Asymmetric along lat |
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gammapy /
gammapy
