def test_conv_hpc_hcc(angle_unit, dsun):
coord = [40.0, 32.0]
result = wcs.convert_hpc_hcc(coord[0], coord[1], angle_units=angle_unit, dsun_meters=dsun)
known_answer = [28512914, 22810332]
assert_allclose(result, known_answer, rtol=1e-2, atol=0)
result = wcs.convert_hpc_hcc(coord[0], coord[1], angle_units=angle_unit, dsun_meters=0.5*dsun)
known_answer = [14323802., 11459042.]
assert_allclose(result, known_answer, rtol=1e-2, atol=0)
# Make sure that z coordinate is returned if parameter z is True
result = wcs.convert_hpc_hcc(coord[0], coord[1], angle_units=angle_unit, dsun_meters=dsun, z=True)
known_answer = [28748691, 22998953, 695016924]
assert_allclose(result, known_answer, rtol=1e-2, atol=0)
def test_conv_hpc_hcc():
coord = [40.0, 32.0]
result = wcs.convert_hpc_hcc(coord[0],
coord[1],
angle_units=img.units['x'])
known_answer = [28748691, 22998953]
assert_allclose(result, known_answer, rtol=1e-2, atol=0)
def test_conv_hpc_hcc():
coord = [40.0, 32.0]
result = wcs.convert_hpc_hcc(coord[0], coord[1], angle_units=img.units['x'])
known_answer = [28748691, 22998953]
assert_allclose(result, known_answer, rtol=1e-2, atol=0)
# Test the dsun_meters parameter for a distance of 0.5 AU
dist = 0.5 * sun.constants.au.si.value
result = wcs.convert_hpc_hcc(coord[0], coord[1], dist, img.units['x'])
known_answer = [14370494, 11496395]
assert_allclose(result, known_answer, rtol=1e-2, atol=0)
# Make sure that z coordinate is returned if parameter z is True
result = wcs.convert_hpc_hcc(coord[0], coord[1], angle_units=img.units['x'],
z=True)
known_answer = [28748691, 22998953, 695016924]
assert_allclose(result, known_answer, rtol=1e-2, atol=0)
def test_conv_hpc_hcc():
coord = [40.0, 32.0]
result = wcs.convert_hpc_hcc(img.rsun_meters,
img.dsun, img.units['x'], img.units['y'],
coord[0], coord[1])
known_answer = [28748691, 22998953]
magnitude = np.floor(np.log10(np.abs(known_answer)))
assert_array_almost_equal(result*10**(-magnitude),
known_answer*10**(-magnitude), decimal=2)
def test_hpc_hcc(Tx, Ty):
hpc = Helioprojective(Tx, Ty)
hcc = hpc.transform_to(Heliocentric)
x, y, z = wcs.convert_hpc_hcc(Tx.value, Ty.value, angle_units='arcsec',
dsun_meters=hpc.D0.to(u.m), z=True)
assert_quantity_allclose(x*u.m, hcc.x)
assert_quantity_allclose(y*u.m, hcc.y)
assert_quantity_allclose(z*u.m, hcc.z)
def test_convert_back():
# Make sure transformation followed by inverse transformation returns
# the original coordinates
coord = [40.0, 32.0]
assert_allclose(wcs.convert_hcc_hpc(*wcs.convert_hpc_hcc(*coord)),
coord, rtol=1e-2, atol=0)
coord = [13.0, 58.0]
assert_allclose(wcs.convert_hg_hcc(*wcs.convert_hcc_hg(*coord)),
coord, rtol=1e-2, atol=0)
coord = [34.0, 45.0]
assert_allclose(wcs.convert_hpc_hg(*wcs.convert_hg_hpc(*coord)),
coord, rtol=1e-2, atol=0)
def test_hpc_hcc(Tx, Ty):
hpc = Helioprojective(Tx, Ty,
observer=HeliographicStonyhurst(0*u.deg, 0*u.deg, 1*u.AU))
hcc = hpc.transform_to(Heliocentric)
d0 = hpc.observer.radius
x, y, z = wcs.convert_hpc_hcc(Tx.value, Ty.value, angle_units='arcsec',
dsun_meters=d0.to(u.m), z=True)
assert_quantity_allclose(x*u.m, hcc.x)
assert_quantity_allclose(y*u.m, hcc.y)
assert_quantity_allclose(z*u.m, hcc.z)
def test_conv_hpc_hcc(angle_unit, dsun):
coord = [40.0, 32.0]
result = wcs.convert_hpc_hcc(coord[0],
coord[1],
angle_units=angle_unit,
dsun_meters=dsun)
known_answer = [28512914, 22810332]
assert_allclose(result, known_answer, rtol=1e-2, atol=0)
result = wcs.convert_hpc_hcc(coord[0],
coord[1],
angle_units=angle_unit,
dsun_meters=0.5 * dsun)
known_answer = [14323802., 11459042.]
assert_allclose(result, known_answer, rtol=1e-2, atol=0)
# Make sure that z coordinate is returned if parameter z is True
result = wcs.convert_hpc_hcc(coord[0],
coord[1],
angle_units=angle_unit,
dsun_meters=dsun,
z=True)
known_answer = [28748691, 22998953, 695016924]
assert_allclose(result, known_answer, rtol=1e-2, atol=0)
def test_hpc_hcc(Tx, Ty):
hpc = Helioprojective(Tx,
Ty,
observer=HeliographicStonyhurst(
0 * u.deg, 0 * u.deg, 1 * u.AU))
hcc = hpc.transform_to(Heliocentric)
d0 = hpc.observer.radius
x, y, z = wcs.convert_hpc_hcc(Tx.value,
Ty.value,
angle_units='arcsec',
dsun_meters=d0.to(u.m),
z=True)
assert_quantity_allclose(x * u.m, hcc.x)
assert_quantity_allclose(y * u.m, hcc.y)
assert_quantity_allclose(z * u.m, hcc.z)
def test_convert_to_coord(dsun, angle_unit, b0, l0):
x, y = (34.0, 96.0)
b0_deg = b0
l0_deg = l0
def check_conversion(from_coord, to_coord, expected):
# Make sure that wcs.convert_to_coord returns the expected value
assert_allclose(wcs.convert_to_coord(x,
y,
from_coord,
to_coord,
b0_deg=b0_deg,
l0_deg=l0_deg,
dsun_meters=dsun,
angle_units=angle_unit),
expected,
rtol=1e-2,
atol=0)
check_conversion('hcc', 'hg',
wcs.convert_hcc_hg(x, y, b0_deg=b0_deg, l0_deg=l0_deg))
check_conversion(
'hpc', 'hg',
wcs.convert_hpc_hg(x,
y,
b0_deg=b0_deg,
l0_deg=l0_deg,
dsun_meters=dsun,
angle_units=angle_unit))
check_conversion('hg', 'hcc',
wcs.convert_hg_hcc(x, y, b0_deg=b0_deg, l0_deg=l0_deg))
check_conversion(
'hcc', 'hpc',
wcs.convert_hcc_hpc(x, y, dsun_meters=dsun, angle_units=angle_unit))
check_conversion(
'hg', 'hpc',
wcs.convert_hg_hpc(x,
y,
b0_deg=b0_deg,
l0_deg=l0_deg,
dsun_meters=dsun,
angle_units=angle_unit))
check_conversion(
'hpc', 'hcc',
wcs.convert_hpc_hcc(x, y, dsun_meters=dsun, angle_units=angle_unit))
def test_convert_to_coord():
x, y = (34.0, 96.0)
b0_deg = img.heliographic_latitude
l0_deg = img.heliographic_longitude
units = img.units['x']
dsun=img.dsun
def check_conversion(from_coord, to_coord, expected):
# Make sure that wcs.convert_to_coord returns the expected value
assert_allclose(wcs.convert_to_coord(x, y, from_coord, to_coord,
b0_deg=b0_deg, l0_deg=l0_deg, dsun_meters=dsun, angle_units=units),
expected, rtol=1e-2, atol=0)
check_conversion('hcc', 'hg', wcs.convert_hcc_hg(x, y, b0_deg=b0_deg,
l0_deg=l0_deg))
check_conversion('hpc', 'hg', wcs.convert_hpc_hg(x, y, b0_deg=b0_deg,
l0_deg=l0_deg, dsun_meters=dsun, angle_units=units))
check_conversion('hg', 'hcc', wcs.convert_hg_hcc(x, y, b0_deg=b0_deg,
l0_deg=l0_deg))
check_conversion('hcc', 'hpc', wcs.convert_hcc_hpc(x, y, dsun_meters=dsun,
angle_units=units))
check_conversion('hg', 'hpc', wcs.convert_hg_hpc(x, y, b0_deg=b0_deg,
l0_deg=l0_deg, dsun_meters=dsun, angle_units=units))
check_conversion('hpc', 'hcc', wcs.convert_hpc_hcc(x, y, dsun_meters=dsun,
angle_units=units))
def test_convert_to_coord(dsun, angle_unit, b0, l0):
x, y = (34.0, 96.0)
b0_deg = b0
l0_deg = l0
def check_conversion(from_coord, to_coord, expected):
# Make sure that wcs.convert_to_coord returns the expected value
assert_allclose(wcs.convert_to_coord(x, y, from_coord, to_coord,
b0_deg=b0_deg, l0_deg=l0_deg, dsun_meters=dsun, angle_units=angle_unit),
expected, rtol=1e-2, atol=0)
check_conversion('hcc', 'hg', wcs.convert_hcc_hg(x, y, b0_deg=b0_deg,
l0_deg=l0_deg))
check_conversion('hpc', 'hg', wcs.convert_hpc_hg(x, y, b0_deg=b0_deg,
l0_deg=l0_deg, dsun_meters=dsun, angle_units=angle_unit))
check_conversion('hg', 'hcc', wcs.convert_hg_hcc(x, y, b0_deg=b0_deg,
l0_deg=l0_deg))
check_conversion('hcc', 'hpc', wcs.convert_hcc_hpc(x, y, dsun_meters=dsun,
angle_units=angle_unit))
check_conversion('hg', 'hpc', wcs.convert_hg_hpc(x, y, b0_deg=b0_deg,
l0_deg=l0_deg, dsun_meters=dsun, angle_units=angle_unit))
check_conversion('hpc', 'hcc', wcs.convert_hpc_hcc(x, y, dsun_meters=dsun,
angle_units=angle_unit))
def map_hpc_to_hg_rotate(m,
epi_lon=0*u.degree, epi_lat=90*u.degree,
lon_bin=1*u.degree, lat_bin=1*u.degree,
lon_num=None, lat_num=None, **kwargs):
"""
Transform raw data in HPC coordinates to HG' coordinates
HG' = HG, except center at wave epicenter
"""
x, y = wcs.convert_pixel_to_data([m.data.shape[1], m.data.shape[0]],
[m.scale.x.value, m.scale.y.value],
[m.reference_pixel.x.value, m.reference_pixel.y.value],
[m.reference_coordinate.x.value, m.reference_coordinate.y.value])
hccx, hccy, hccz = wcs.convert_hpc_hcc(x,
y,
angle_units=m.spatial_units.x,
dsun_meters=m.dsun.to('meter').value,
z=True)
rot_hccz, rot_hccx, rot_hccy = euler_zyz((hccz,
hccx,
hccy),
(0.,
epi_lat.to('degree').value-90.,
-epi_lon.to('degree').value))
lon_map, lat_map = wcs.convert_hcc_hg(rot_hccx,
rot_hccy,
b0_deg=m.heliographic_latitude.to('degree').value,
l0_deg=m.heliographic_longitude.to('degree').value,
z=rot_hccz)
lon_range = (np.nanmin(lon_map), np.nanmax(lon_map))
lat_range = (np.nanmin(lat_map), np.nanmax(lat_map))
# This method results in a set of lons and lats that in general does not
# exactly span the range of the data.
# lon = np.arange(lon_range[0], lon_range[1], lon_bin)
# lat = np.arange(lat_range[0], lat_range[1], lat_bin)
# This method gives a set of lons and lats that exactly spans the range of
# the data at the expense of having to define values of cdelt1 and cdelt2
if lon_num is None:
cdelt1 = lon_bin.to('degree').value
lon = np.arange(lon_range[0], lon_range[1], cdelt1)
else:
nlon = lon_num.to('pixel').value
cdelt1 = (lon_range[1] - lon_range[0]) / (1.0*nlon - 1.0)
lon = np.linspace(lon_range[0], lon_range[1], num=nlon)
if lat_num is None:
cdelt2 = lat_bin.to('degree').value
lat = np.arange(lat_range[0], lat_range[1], cdelt2)
else:
nlat = lat_num.to('pixel').value
cdelt2 = (lat_range[1] - lat_range[0]) / (1.0*nlat - 1.0)
lat = np.linspace(lat_range[0], lat_range[1], num=nlat)
# Create the grid
x_grid, y_grid = np.meshgrid(lon, lat)
ng_xyz = wcs.convert_hg_hcc(x_grid,
y_grid,
b0_deg=m.heliographic_latitude.to('degree').value,
l0_deg=m.heliographic_longitude.to('degree').value,
z=True)
ng_zp, ng_xp, ng_yp = euler_zyz((ng_xyz[2],
ng_xyz[0],
ng_xyz[1]),
(epi_lon.to('degree').value,
90.-epi_lat.to('degree').value,
0.))
# The function ravel flattens the data into a 1D array
points = np.vstack((lon_map.ravel(), lat_map.ravel())).T
values = np.array(m.data).ravel()
# Get rid of all of the bad (nan) indices (i.e. those off of the sun)
index = np.isfinite(points[:, 0]) * np.isfinite(points[:, 1])
# points = np.vstack((points[index,0], points[index,1])).T
points = points[index]
values = values[index]
newdata = griddata(points, values, (x_grid, y_grid), **kwargs)
newdata[ng_zp < 0] = np.nan
dict_header = {
'CDELT1': cdelt1,
'NAXIS1': len(lon),
'CRVAL1': lon.min(),
'CRPIX1': crpix12_value_for_HG,
'CRPIX2': crpix12_value_for_HG,
'CUNIT1': "deg",
'CTYPE1': "HG",
'CDELT2': cdelt2,
'NAXIS2': len(lat),
'CRVAL2': lat.min(),
'CUNIT2': "deg",
'CTYPE2': "HG",
'DATE_OBS': m.meta['date-obs'],
'DSUN_OBS': m.dsun.to('m').value,
"CRLN_OBS": m.carrington_longitude.to('degree').value,
"HGLT_OBS": m.heliographic_latitude.to('degree').value,
"HGLN_OBS": m.heliographic_longitude.to('degree').value,
'EXPTIME': m.exposure_time.to('s').value
}
# Find out where the non-finites are
mask = np.logical_not(np.isfinite(newdata))
# Return a masked array is appropriate
if mask is None:
hg = Map(newdata, MapMeta(dict_header))
else:
hg = Map(ma.array(newdata, mask=mask), MapMeta(dict_header))
hg.plot_settings = m.plot_settings
return hg
def map_hpc_to_hg_rotate(map, epi_lon = 0, epi_lat = 90, lon_bin = 1, lat_bin = 1):
"""
Transform raw data in HPC coordinates to HG' coordinates
HG' = HG, except center at wave epicenter
"""
x, y = sunpy.wcs.convert_pixel_to_data([map.shape[1], map.shape[0]],
[map.scale['x'], map.scale['y']],
[map.reference_pixel['x'], map.reference_pixel['y']],
[map.reference_coordinate['x'],map.reference_coordinate['y']])
hccx, hccy, hccz = wcs.convert_hpc_hcc(x, y, angle_units=map.units['x'], z=True)
rot_hccz, rot_hccx, rot_hccy = euler_zyz((hccz, hccx, hccy), (0., epi_lat-90., -epi_lon))
lon_map, lat_map = wcs.convert_hcc_hg(rot_hccx, rot_hccy, b0_deg=map.heliographic_latitude,
l0_deg=map.heliographic_longitude,z = rot_hccz)
lon_range = (np.nanmin(lon_map), np.nanmax(lon_map))
lat_range = (np.nanmin(lat_map), np.nanmax(lat_map))
lon = np.arange(lon_range[0], lon_range[1], lon_bin)
lat = np.arange(lat_range[0], lat_range[1], lat_bin)
x_grid, y_grid = np.meshgrid(lon, lat)
ng_xyz = wcs.convert_hg_hcc(x_grid, y_grid,b0_deg=map.heliographic_latitude,
l0_deg=map.heliographic_longitude,z=True)
ng_zp, ng_xp, ng_yp = euler_zyz((ng_xyz[2], ng_xyz[0], ng_xyz[1]),
(epi_lon, 90.-epi_lat, 0.))
#ravel flattens the data into a 1D array
points = np.vstack((lon_map.ravel(), lat_map.ravel())).T
values = np.array(map).ravel()
# get rid of all of the bad (nan) indices (i.e. those off of the sun)
index = np.isfinite(points[:,0]) * np.isfinite(points[:,1])
#points = np.vstack((points[index,0], points[index,1])).T
points = points[index]
values = values[index]
newdata = griddata(points, values, (x_grid,y_grid), method="linear")
newdata[ng_zp < 0] = np.nan
dict_header = {
'CDELT1': lon_bin,
'NAXIS1': len(lon),
'CRVAL1': lon.min(),
'CRPIX1': 1,
'CRPIX2': 1,
'CUNIT1': "deg",
'CTYPE1': "HG",
'CDELT2': lat_bin,
'NAXIS2': len(lat),
'CRVAL2': lat.min(),
'CUNIT2': "deg",
'CTYPE2': "HG",
'DATE_OBS': map.meta['date-obs']
}
header = dict_header
transformed_map = sunpy.map.Map(newdata, header)
transformed_map.name = map.name
return transformed_map
def map_hpc_to_hg_rotate(map, epi_lon=0, epi_lat=90, lon_bin=1, lat_bin=1):
"""
Transform raw data in HPC coordinates to HG' coordinates
HG' = HG, except center at wave epicenter
"""
x, y = sunpy.wcs.convert_pixel_to_data(
[map.shape[1], map.shape[0]], [map.scale['x'], map.scale['y']],
[map.reference_pixel['x'], map.reference_pixel['y']],
[map.reference_coordinate['x'], map.reference_coordinate['y']])
hccx, hccy, hccz = wcs.convert_hpc_hcc(x,
y,
angle_units=map.units['x'],
z=True)
rot_hccz, rot_hccx, rot_hccy = euler_zyz((hccz, hccx, hccy),
(0., epi_lat - 90., -epi_lon))
lon_map, lat_map = wcs.convert_hcc_hg(rot_hccx,
rot_hccy,
b0_deg=map.heliographic_latitude,
l0_deg=map.heliographic_longitude,
z=rot_hccz)
lon_range = (np.nanmin(lon_map), np.nanmax(lon_map))
lat_range = (np.nanmin(lat_map), np.nanmax(lat_map))
lon = np.arange(lon_range[0], lon_range[1], lon_bin)
lat = np.arange(lat_range[0], lat_range[1], lat_bin)
x_grid, y_grid = np.meshgrid(lon, lat)
ng_xyz = wcs.convert_hg_hcc(x_grid,
y_grid,
b0_deg=map.heliographic_latitude,
l0_deg=map.heliographic_longitude,
z=True)
ng_zp, ng_xp, ng_yp = euler_zyz((ng_xyz[2], ng_xyz[0], ng_xyz[1]),
(epi_lon, 90. - epi_lat, 0.))
#ravel flattens the data into a 1D array
points = np.vstack((lon_map.ravel(), lat_map.ravel())).T
values = np.array(map).ravel()
# get rid of all of the bad (nan) indices (i.e. those off of the sun)
index = np.isfinite(points[:, 0]) * np.isfinite(points[:, 1])
#points = np.vstack((points[index,0], points[index,1])).T
points = points[index]
values = values[index]
newdata = griddata(points, values, (x_grid, y_grid), method="linear")
newdata[ng_zp < 0] = np.nan
dict_header = {
'CDELT1': lon_bin,
'NAXIS1': len(lon),
'CRVAL1': lon.min(),
'CRPIX1': 1,
'CRPIX2': 1,
'CUNIT1': "deg",
'CTYPE1': "HG",
'CDELT2': lat_bin,
'NAXIS2': len(lat),
'CRVAL2': lat.min(),
'CUNIT2': "deg",
'CTYPE2': "HG",
'DATE_OBS': map.meta['date-obs']
}
header = dict_header
transformed_map = sunpy.map.Map(newdata, header)
transformed_map.name = map.name
return transformed_map
def test_conv_hpc_hcc():
coord = [40.0, 32.0]
result = wcs.convert_hpc_hcc(coord[0], coord[1], angle_units=img.units['x'])
known_answer = [28748691, 22998953]
assert_allclose(result, known_answer, rtol=1e-2, atol=0)
from sunpy import wcs print(wcs.convert_hg_hpc(10, 53)) # Convert that position back to heliographic coordinates print(wcs.convert_hpc_hg(100.49, 767.97)) # Try to convert a position which is not on the Sun to HG print(wcs.convert_hpc_hg(-1500, 0)) # Convert sky coordinate to a position in HCC print(wcs.convert_hpc_hcc(-300, 400, z=True))
