emirdrp.instrument — Static configuration

emirdrp.instrument.channels.braid(*iterables)

Return the elements of each iterator in turn until some is exhausted. This function is similar to the roundrobin example in itertools documentation. >>> a = iter([1,2,3,4]) >>> b = iter([‘a’, ‘b’]) >>> c = iter([1,1,1,1,’a’, ‘c’]) >>> d = iter([1,1,1,1,1,1]) >>> list(braid(a, b, c, d)) [1, ‘a’, 1, 1, 2, ‘b’, 1, 1]

emirdrp.instrument.channels.convert_name_to_channels(conf)
class emirdrp.instrument.csu_configuration.CsuConfiguration

Configurable Slit Unit (CSU) Configuration class definition.

_csu_bar_left

Location (mm) of the left bar for each slitlet.

Type:

list of floats

_csu_bar_right

Location (mm) of the right bar for each slitlet, using the same origin employed for _csu_bar_left (which is not the value stored in the FITS keywords.

Type:

list of floats

_csu_bar_slit_center

Middle point (mm) in between the two bars defining a slitlet.

Type:

list of floats

_csu_bar_slit_width

Slitlet width (mm), computed as the distance between the two bars defining the slitlet.

Type:

list of floats

csu_bar_left(islitlet)

Return csu_bar_left for requested slitlet number.

csu_bar_right(islitlet)

Return csu_bar_right for requested slitlet number.

csu_bar_slit_center(islitlet)

Return csu_bar_slit_center for requested slitlet number.

csu_bar_slit_width(islitlet)

Return csu_bar_slit_width for requested slitlet number.

classmethod define_from_fits(fitsobj, extnum=None)

Define class members from header information in FITS file.

Parameters:

  • fitsobj (file object) – FITS file whose header contains the CSU bar information needed to initialise the members of this class.

  • extnum (None or int or str) – Extension number or extension name. If None, select ‘MECS’ extension if available. If not, use priamry extension

classmethod define_from_header(image_header)

Define class members directly from FITS header.

Parameters:

image_header (instance of hdulist.header) – Header content from a FITS file.

display_pseudo_longslits(list_valid_slitlets=None, fracwidth=0.25, diffcenter=0.25)
outdict(ndigits=3)

Return dictionary structure rounded to a given precision.

pseudo_longslits(list_valid_slitlets=None, fracwidth=0.25, diffcenter=0.25)

Return dictionary of LongSlit instances

Parameters:

  • list_valid_slitlets (list of integers or 'all') – List containing valid slitlets. Slitlet numbers not included in this list will be considered as individual longslits. If this list is None, all the slitlets are analysed.

  • fracwidth (float) – Maximum fractional slitlet width difference allowed to consider that two slitlets belong to the same longslit.

  • diffcenter (float) – Maximum allowed difference between slitlet centers (in units of the averaged slitlet widths).

Returns:

result – Each LongSlit object provides the minimum and maximum islitlet for each longslit.

Return type:

dictionary of LongSlit instances

widths_in_range_mm(minwidth=0.0, maxwidth=1000.0)

Return list of slitlets which width is within given range

Parameters:

  • minwidth (float) – Minimum slit width (mm).

  • maxwidth (float) – Maximum slit width (mm).

Returns:

list_ok – List of booleans indicating whether the corresponding slitlet width is within range

Return type:

list

class emirdrp.instrument.csu_configuration.LongSlit(imin=None, imax=None)

Auxiliary class to store the minimum and maximum islitlet

imax()
imin()
emirdrp.instrument.csu_configuration.merge_odd_even_csu_configurations(conf_odd, conf_even)

Merge CSU configuration using odd- and even-numbered values.

The CSU returned CSU configuration include the odd-numbered values from ‘conf_odd’ and the even-numbered values from ‘conf_even’.

Parameters:

  • conf_odd (CsuConfiguration instance) – CSU configuration corresponding to odd-numbered slitlets.

  • conf_even (CsuConfiguration instance) – CSU configuration corresponding to even-numbered slitlets.

Returns:

merged_conf – CSU configuration resulting from the merging process.

Return type:

CsuConfiguration instance

emirdrp.instrument.distortions.adapt_wcs(wcs, rotang_deg, ipa_deg)

Adapt WCS to use in distortions

emirdrp.instrument.distortions.exvp(pos_x, pos_y)

Convert virtual pixel to real pixel

This function is deprecated, use wcs_exvp instead

emirdrp.instrument.distortions.pix2virt(pos, origin=1)

This function is deprecated, use wcs_pix2virt instead

emirdrp.instrument.distortions.pvex(pos_x, pos_y)

Convert real pixel to virtual pixel

This function is deprecated, use wcs_pvex instead

emirdrp.instrument.distortions.wcs_exvp(wcs, xv, yv)

Convert virtual pixel to real pixel

emirdrp.instrument.distortions.wcs_pix2virt(wcs, pos, origin=1)
emirdrp.instrument.distortions.wcs_pvex(wcs, xr, yr)

Convert real pixel to virtual pixel