flames_cal_orderpos7

Usage

Overview

The recipe defines the simultaneus calibration fibre order positions in a fibre-echelle image. The orders are initially detected by means of a Hough transformation, the orders are then traced, and the positions are finally fitted with a global polynomial.

Expected input frames are simultaneous calibration fibre flat fields, FIB_ORDEF_RED and optionally for each chip a DRS setup table, DRS_TABLE_(REDL|REDU), for backward compatibility, and optionally a guess order table
FIB_ORD_GUE_(REDL|REDU) and a master bias, MASTER_BIAS_(REDL|REDU).

The recipe processes only the first raw frame found.

Output are two order tables FIB_ORD_TAB_(REDL|REDU) contaning the columns: X : Position along x Order : Relative order number Y : Order line centroid location Yfit : The fitted order location dY : Uncertainty of Y dYfit_Square : Variance of Yfit Residual : Y - Yfit Residual_Square : Residual^2 OrderRMS : Root mean squared residual of initial
one-dimensional linear fit of order

The bivariate fit polynomial itself is stored in table extension no. 2.

The 3rd table extension contains a table that defines the active fibre traces and their positions (for support of FLAMES/UVES) and 2 images frames FIB_ORDEF_(REDL|REDU)

Options

--backsubdegx <int>

Degree (in x) of polynomial used to estimate the background (mode=poly). (int; default: 2). The full name of this option for the EsoRex configuration file is flames_cal_orderpos.preproc.backsubdegx [default = 2].

--backsubdegy <int>

Degree (in y) of polynomial used to estimate the background (mode=poly). (int; default: 2). The full name of this option for the EsoRex configuration file is flames_cal_orderpos.preproc.backsubdegy [default = 2].

--backsubgrid <int>

Number of grid points (in x- and y-direction) used to estimate the background (mode=poly). (int; default: 50). The full name of this option for the EsoRex configuration file is flames_cal_orderpos.preproc.backsubgrid [default = 50].

--backsubkappa <float>

The value of kappa in the one-sided kappa-sigma clipping used to estimate the background (mode=poly). (float; default: 4.0). The full name of this option for the EsoRex configuration file is flames_cal_orderpos.preproc.backsubkappa [default = 4.0].

--backsubradiusy <int>

The height (in pixels) of the background sampling window is (2*radiusy + 1). This parameter is not corrected for binning. (int; default: 2). The full name of this option for the EsoRex configuration file is flames_cal_orderpos.preproc.backsubradiusy [default = 2].

--debug <bool>

Whether or not to save intermediate results to local directory (bool; default: False). The full name of this option for the EsoRex configuration file is uves.debug [default = False].

--defpol1 <int>

The degree of the bivarite fit (cross dispersion direction). If negative, the degree is optimized to give the best fit (int; default: -1). The full name of this option for the EsoRex configuration file is flames_cal_orderpos.reject.defpol1 [default = -1].

--defpol2 <int>

The degree of the bivarite fit (order number). If negative, the degree is optimized to give the best fit (int; default: -1). The full name of this option for the EsoRex configuration file is flames_cal_orderpos.reject.defpol2 [default = -1].

--kappa <float>

Used for kappa-sigma clipping of the final polynomial fit. If negative, no clipping is done (float; default: 4.0). The full name of this option for the EsoRex configuration file is flames_cal_orderpos.reject.kappa [default = 4.0].

--maxgap <float>

If the order line drops below detection threshold, the order tracing algorithm will try to jump a gap of maximum size ´maxgap´ multiplied by the image width (float; default: 0.2). The full name of this option for the EsoRex configuration file is flames_cal_orderpos.trace.maxgap [default = 0.2].

--maxrms <float>

When fitting the orders with straight lines, this is the maximum allowed RMS relative to the median RMS of all orders (float; default: 100.0). The full name of this option for the EsoRex configuration file is flames_cal_orderpos.reject.maxrms [default = 100.0].

--maxslope <float>

Maximum possible line slope (float; default: 0.2). The full name of this option for the EsoRex configuration file is flames_cal_orderpos.hough.maxslope [default = 0.2].

--minslope <float>

Minimum possible line slope. This should be the ´physical´ slope on the chip, i.e. not taking binning factors into account, which is handled by the recipe (float; default: 0.0). The full name of this option for the EsoRex configuration file is flames_cal_orderpos.hough.minslope [default = 0.0].

--minthresh <float>

The minimum threshold value is (min + minthres*(max - min)). Here ´min´ and ´max´ are the lowest and highest pixel values in the central bin of the order (float; default: 0.2). The full name of this option for the EsoRex configuration file is flames_cal_orderpos.trace.minthresh [default = 0.2].

--mmethod <str>

Background subtraction method. If equal to ´median´ the background is sampled using the median of a sub-window. If ´minimum´, the minimum sub-window value is used. If ´no´, no background subtraction is done. (str; default: ´median´). The full name of this option for the EsoRex configuration file is flames_cal_orderpos.preproc.mmethod [default = median].

--plotter <str>

Any plots produced by the recipe are redirected to the command specified by this parameter. The plotting command must contain the substring ´gnuplot´ and must be able to parse gnuplot syntax on its standard input. Valid examples of such a command may include ´gnuplot -persist´ and ´cat > mygnuplot$$.gp´. A finer control of the plotting options can be obtained by writing an executable script, e.g. my_gnuplot.pl, that executes gnuplot after setting the desired gnuplot options (e.g. set terminal pslatex color). To turn off plotting, set this parameter to ´no´ (str; default: ´no´). The full name of this option for the EsoRex configuration file is uves.plotter [default = no].

--process_chip <str>

For RED arm data process the redl, redu, or both chip(s) (str; default: ´both´). The full name of this option for the EsoRex configuration file is uves.process_chip [default = both].

--pthres <float>

In automatic mode, or if the number of orders to detect is read from a guess table, the detection of new lines stops when the intensity of a candidate line drops to less than ´pthres´ times the intensity of the previous detection. (float; default: 0.2). The full name of this option for the EsoRex configuration file is flames_cal_orderpos.hough.pthres [default = 0.2].

--radx <int>

Half X size of median filtering window (int; default: 2). The full name of this option for the EsoRex configuration file is flames_cal_orderpos.preproc.radx [default = 2].

--rady <int>

Half Y size of median filtering window (int; default: 1). The full name of this option for the EsoRex configuration file is flames_cal_orderpos.preproc.rady [default = 1].

--samplewidth <int>

Separation of sample traces (used by Hough transform) in input image (int; default: 50). The full name of this option for the EsoRex configuration file is flames_cal_orderpos.hough.samplewidth [default = 50].

--sloperes <int>

Resolution (width in pixels) of Hough space (int; default: 120). The full name of this option for the EsoRex configuration file is flames_cal_orderpos.hough.sloperes [default = 120].

--tracestep <int>

The step size used when tracing the orders (int; default: 10). The full name of this option for the EsoRex configuration file is flames_cal_orderpos.trace.tracestep [default = 10].

--use_guess_tab <int>

If a Guess order table is provided this parameter set how it is used:0: No usage, 1: use it to set lower/upper Y raws where order are searched 2: the order table try to fully match the guess (int; default: 1). The full name of this option for the EsoRex configuration file is flames_cal_orderpos.preproc.use_guess_tab [default = 1].

Note that it is possible to create a configuration file containing these options, along with suitable default values. Please refer to the details provided by the 'esorex --help' command.

Version

flames_cal_orderpos 6.1.8