autowisp.astrometry.transformation module
Class Inheritance Diagram
Define class to apply sky-to-frame transformation stored in DR files.
- class autowisp.astrometry.transformation.Transformation(dr_fname=None, **dr_path_substitutions)[source]
Bases:
object
A class that applies transformation stored in DR files.
- pre_projection
One of the map projections in autowisp.astrometry.map_projections that is applied first to transform RA, Dec -> xi, eta. The latter are then projected to x, y.
- Type:
callable
- evaluate_transformation
Evaluator for the pre-projected catalog -> frame coordinates transformation.
- Type:
fit_expression.Interface
- __call__(sources, save_intermediate=False, in_place=False)[source]
Return the projected positions of the given catalogue sources.
- Parameters:
sources (structured numpy array or pandas.DataFrame) – The catalogue sources to project.
save_intermediate (bool) – If True, the result includes the coordinate of the pre-projection, in addition to the final frame coordinates.
in_place (bool) – If True, the input sources are updated with the projected coordinates (sources must allow setting entries for x and y columns, also for xi and eta if save_intermediate is True).
- Returns:
The projected source positions with labels ‘x’, ‘y’, and optionally (if save_intermediate == True) the pre-projected coordinates xi and eta. If in_place is True, return None.
- Return type:
numpy structured array
- __init__(dr_fname=None, **dr_path_substitutions)[source]
Prepare to apply the transformation stored in the given DR file.
- Parameters:
dr_fname (str) – The filename of the data reduction file to read a transformation from. If not specified, read_transformation() must be called before using this class.
- Returns:
None
- static _create_projected_arrays(sources, save_intermediate, in_place)[source]
Create a numpy structured array to hold the projected sources.
- inverse(x, y, result='equatorial', **source_properties)[source]
Return the sky coordinates of the given source.