autowisp.astrometry.anmatch_transformation module
Class Inheritance Diagram
Define a class to apply sky-to-frame transformations found by anmatch.
- class autowisp.astrometry.anmatch_transformation.AnmatchTransformation(trans_file=None)[source]
Bases:
object
A clas that applies transformations generated by anmatch.
- __call__(sources, save_intermediate=False)[source]
Return the x and y coordinates to which the given (ra, dec) project to.
- Parameters:
sources – The sky position to project to frame coordinates. Should have keys named ‘RA’ and ‘Dec’ in degrees.
save_intermediate – Should the intermediate coordinates be saved. Those are the coordinates after apllying the sky projection and before applying the polynomial transformation.
- Returns:
The position in pixels relative to the lower left frame of the corner to which the given sky position projects under the currently defined transformation, as a numpy array with fields named ‘x’ and ‘y’. If save_intermediate is True, the result also contains fields called ‘xi’ and ‘eta’ containing the intermediate coordinates.
- Return type:
- __init__(trans_file=None)[source]
Parse the transformation to apply from the given file.
- Parameters:
trans_file – The transformation file contaning the transformation to apply. If this is the name of an existing file, it is opened and parsed, otherwise this should be a sequence of the lines contained in the transfomation file.
- Returns:
None
- evaluate_polynomial(projected, transformed)[source]
Apply the currently defined polynomial transfomation to (xi, eta).
- Parameters:
projected – The projected (c.f. gnomonic_projection()) coordinates to transform. Should have ‘xi’ and ‘eta’ keys containing the projected coordinates to transform in degrees.
transformed – A numpy array with ‘x’ and ‘y’ fields to fill with the transformed coordinates (in pixels).
- Returns:
None