| 7 | 7 | |
| 8 | 8 | import numpy as np |
| 9 | 9 | import erfa |
| 10 | import astropy.units as u | |
| 10 | 11 | |
| 11 | 12 | from astropy.coordinates.baseframe import frame_transform_graph |
| 12 | 13 | from astropy.coordinates.transformations import FunctionTransformWithFiniteDifference |
| 17 | 18 | from .cirs import CIRS |
| 18 | 19 | from .itrs import ITRS |
| 19 | 20 | from .equatorial import TEME, TETE |
| 20 | from .utils import get_polar_motion, get_jd12, EARTH_CENTER | |
| 21 | from .altaz import AltAz | |
| 22 | from .hadec import HADec | |
| 23 | from .utils import get_polar_motion, get_jd12, EARTH_CENTER, PIOVER2 | |
| 24 | from astropy.coordinates.matrix_utilities import rotation_matrix | |
| 21 | 25 | |
| 22 | 26 | # # first define helper functions |
| 23 | 27 | |
| 272 | 276 | return teme_frame.realize_frame(newrepr) |
| 273 | 277 | |
| 274 | 278 | |
| 279 | def itrs_to_observed_mat(observed_frame): | |
| 280 | """ | |
| 281 | Create the transformation matrix from ITRS to observed frame (AltAz or HADec). | |
| 282 | ||
| 283 | Parameters | |
| 284 | ---------- | |
| 285 | observed_frame : AltAz or HADec | |
| 286 | The target observed coordinate frame | |
| 287 | ||
| 288 | Returns | |
| 289 | ------- | |
| 290 | matrix : ndarray | |
| 291 | 3x3 transformation matrix | |
| 292 | """ | |
| 293 | lon, lat, height = observed_frame.location.to_geodetic('WGS84') | |
| 294 | elong = lon.to_value(u.radian) | |
| 295 | ||
| 296 | if isinstance(observed_frame, AltAz): | |
| 297 | # form ITRS to AltAz matrix | |
| 298 | elat = lat.to_value(u.radian) | |
| 299 | # AltAz frame is left handed | |
| 300 | minus_x = np.eye(3) | |
| 301 | minus_x[0][0] = -1.0 | |
| 302 | mat = (minus_x | |
| 303 | @ rotation_matrix(PIOVER2 - elat, 'y', unit=u.radian) | |
| 304 | @ rotation_matrix(elong, 'z', unit=u.radian)) | |
| 305 | ||
| 306 | else: | |
| 307 | # form ITRS to HADec matrix | |
| 308 | # HADec frame is left handed | |
| 309 | minus_y = np.eye(3) | |
| 310 | minus_y[1][1] = -1.0 | |
| 311 | mat = (minus_y | |
| 312 | @ rotation_matrix(elong, 'z', unit=u.radian)) | |
| 313 | return mat | |
| 314 | ||
| 315 | ||
| 316 | @frame_transform_graph.transform(FunctionTransformWithFiniteDifference, ITRS, AltAz) | |
| 317 | @frame_transform_graph.transform(FunctionTransformWithFiniteDifference, ITRS, HADec) | |
| 318 | def itrs_to_observed(itrs_coo, observed_frame): | |
| 319 | """ | |
| 320 | Transform from ITRS to observed frame (AltAz or HADec). | |
| 321 | ||
| 322 | This transformation stays entirely within the ITRS and treats ITRS positions | |
| 323 | as time invariant, avoiding issues with geocentric vs topocentric aberration. | |
| 324 | The obstime of the output frame is adopted without transformation. | |
| 325 | """ | |
| 326 | # Trying to synchronize the obstimes here makes no sense. In fact, | |
| 327 | # it's a real gotcha as doing an ITRS->ITRS transform references | |
| 328 | # ITRS coordinates, which should be tied to the Earth, to the SSB. | |
| 329 | # Instead, we treat ITRS coordinates as time invariant here. | |
| 330 | ||
| 331 | # form the Topocentric ITRS position | |
| 332 | topocentric_itrs_repr = (itrs_coo.cartesian | |
| 333 | - observed_frame.location.get_itrs().cartesian) | |
| 334 | rep = topocentric_itrs_repr.transform(itrs_to_observed_mat(observed_frame)) | |
| 335 | return observed_frame.realize_frame(rep) | |
| 336 | ||
| 337 | ||
| 338 | @frame_transform_graph.transform(FunctionTransformWithFiniteDifference, AltAz, ITRS) | |
| 339 | @frame_transform_graph.transform(FunctionTransformWithFiniteDifference, HADec, ITRS) | |
| 340 | def observed_to_itrs(observed_coo, itrs_frame): | |
| 341 | """ | |
| 342 | Transform from observed frame (AltAz or HADec) to ITRS. | |
| 343 | ||
| 344 | This is the inverse transformation of itrs_to_observed. | |
| 345 | """ | |
| 346 | # form the Topocentric ITRS position | |
| 347 | topocentric_itrs_repr = observed_coo.cartesian.transform(matrix_transpose( | |
| 348 | itrs_to_observed_mat(observed_coo))) | |
| 349 | # form the Geocentric ITRS position | |
| 350 | rep = topocentric_itrs_repr + observed_coo.location.get_itrs().cartesian | |
| 351 | return itrs_frame.realize_frame(rep) | |
| 352 | ||
| 353 | ||
| 275 | 354 | # Create loopback transformations |
| 276 | 355 | frame_transform_graph._add_merged_transform(ITRS, CIRS, ITRS) |
| 277 | 356 | frame_transform_graph._add_merged_transform(PrecessedGeocentric, GCRS, PrecessedGeocentric) |
| Test Name | Status |
|---|---|
astropy/coordinates/tests/test_intermediate_transformations.py::test_itrs_topo_to_altaz_with_refraction | Fail |
astropy/coordinates/tests/test_intermediate_transformations.py::test_itrs_topo_to_hadec_with_refraction | Fail |
astropy/coordinates/tests/test_intermediate_transformations.py::test_cirs_itrs_topo | Fail |
astropy/coordinates/tests/test_intermediate_transformations.py::test_itrs_straight_overhead | Fail |
astropy/coordinates/tests/test_intermediate_transformations.py::test_gcrs_altaz_bothroutes[testframe0] | Fail |
astropy/coordinates/tests/test_intermediate_transformations.py::test_gcrs_altaz_bothroutes[testframe1] | Fail |
astropy/coordinates/tests/test_intermediate_transformations.py::test_gcrs_altaz_bothroutes[testframe2] | Fail |
astropy/coordinates/tests/test_intermediate_transformations.py::test_gcrs_altaz_bothroutes[testframe3] | Fail |
astropy/coordinates/tests/test_intermediate_transformations.py::test_gcrs_altaz_bothroutes[testframe4] | Fail |
astropy/coordinates/tests/test_intermediate_transformations.py::test_icrs_gcrs[icoo0] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_icrs_gcrs[icoo1] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_icrs_gcrs_dist_diff[gframe0] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_icrs_gcrs_dist_diff[gframe1] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_cirs_to_altaz | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_cirs_to_hadec | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_gcrs_itrs | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_cirs_itrs | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_gcrs_cirs | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_gcrs_altaz | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_gcrs_hadec | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_precessed_geocentric | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_precessed_geocentric_different_obstime | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_gcrs_altaz_sunish[testframe0] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_gcrs_altaz_sunish[testframe1] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_gcrs_altaz_sunish[testframe2] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_gcrs_altaz_sunish[testframe3] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_gcrs_altaz_sunish[testframe4] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_gcrs_altaz_moonish[testframe0] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_gcrs_altaz_moonish[testframe1] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_gcrs_altaz_moonish[testframe2] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_gcrs_altaz_moonish[testframe3] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_gcrs_altaz_moonish[testframe4] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_cirs_altaz_moonish[testframe0] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_cirs_altaz_moonish[testframe1] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_cirs_altaz_moonish[testframe2] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_cirs_altaz_moonish[testframe3] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_cirs_altaz_moonish[testframe4] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_cirs_altaz_nodist[testframe0] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_cirs_altaz_nodist[testframe1] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_cirs_altaz_nodist[testframe2] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_cirs_altaz_nodist[testframe3] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_cirs_altaz_nodist[testframe4] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_cirs_icrs_moonish[testframe0] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_cirs_icrs_moonish[testframe1] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_cirs_icrs_moonish[testframe2] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_cirs_icrs_moonish[testframe3] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_cirs_icrs_moonish[testframe4] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_gcrs_icrs_moonish[testframe0] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_gcrs_icrs_moonish[testframe1] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_gcrs_icrs_moonish[testframe2] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_gcrs_icrs_moonish[testframe3] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_gcrs_icrs_moonish[testframe4] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_icrs_gcrscirs_sunish[testframe0] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_icrs_gcrscirs_sunish[testframe1] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_icrs_gcrscirs_sunish[testframe2] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_icrs_gcrscirs_sunish[testframe3] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_icrs_gcrscirs_sunish[testframe4] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_icrs_altaz_moonish[testframe0] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_icrs_altaz_moonish[testframe1] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_icrs_altaz_moonish[testframe2] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_icrs_altaz_moonish[testframe3] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_icrs_altaz_moonish[testframe4] | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_gcrs_self_transform_closeby | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_teme_itrf | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_precessedgeocentric_loopback | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_teme_loopback | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_tete_transforms | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_straight_overhead | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::test_aa_high_precision_nodata | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::TestGetLocationGCRS::test_get_gcrs_posvel | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::TestGetLocationGCRS::test_tete_quick | Pass |
astropy/coordinates/tests/test_intermediate_transformations.py::TestGetLocationGCRS::test_cirs_quick | Pass |
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