lines_to_surface¶

pydis.lines_to_surface(img, xcent, ycent, wcent, mode='spline2d', fit_order=2, display=False)[source]¶

Turn traced arc lines into a wavelength solution across the entire chip

Requires inputs from line_trace(). Outputs are a 2d wavelength solution

Parameters

img2d array: the HeNeAr data
xcent1d array: the X (spatial) pixel positions of the HeNeAr lines
ycent1d array: the Y (wavelength) pixel positions of the HeNeAr lines
wcent1d array: the wavelength values of the HeNeAr lines
modestr, {‘poly’, ‘spline’, ‘spline2d’}: what mode of interpolation to use to go from traces along the HeNeAr lines to a wavelength value for every (x,y) pixel? Options include (1) poly: along 1-pixel wide slices in the spatial dimension, fit a polynomial between the HeNeAr lines. Uses fit_order; (2) spline: along 1-pixel wide slices in the spatial dimension, fit a quadratic spline; (3) spline2d: fit a full 2d surface using a cubic spline. This is the best option, in principle.

Returns