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\section{The configuration file}
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\label{chap:configfile}
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Each time it is run, {\sc SExtractor} looks for a configuration file. If no
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configuration file is specified in the command-line, it is assumed to
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be called ``{\tt default.sex}'' and to reside in the current
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directory. If no configuration file is found, {\sc SExtractor} will use its own
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internal default configuration.
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\subsection{Creating a configuration file}
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{\sc SExtractor} can generate an ASCII dump of its internal default
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configuration, using the ``{\tt -d}'' option. By redirecting the standard
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output of {\sc SExtractor} to a file, one creates a configuration file that
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can easily be modified afterwards:
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{\tt \% sex -d > default.sex}
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A more extensive dump with less commonly used parameters can be generated by
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using the ``{\tt -dd}'' option.
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\subsection{Format of the configuration file}
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The format is ASCII. There must be only one parameter set per line,
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following the form:
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~~~~ {\em Config-parameter ~~~~ Value(s)}
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Extra spaces or linefeeds are ignored. Comments must begin with a ``\#''
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and end with a linefeed. Values can be of different
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types: strings (can be enclosed between double quotes), floats, integers, keywords or Boolean
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({\tt Y/y} or {\tt N/n}). Some parameters accept zero or several values, which must then be
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separated by commas.
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Integers can be given as decimals, in octal form (preceded by digit {\tt O}), or in hexadecimal
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(preceded by {\tt 0x}). The hexadecimal format is particularly convenient for writing multiplexed
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bit values such as binary masks. Environment variables, written as {\tt \$HOME} or {\tt \$\{HOME\}}
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are expanded, and not only for string parameters. Some parameters are assigned default values in
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{\sc SExtractor} and can therefore be omitted from the configuration file; they are listed in
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\S\ref{chap:config}.
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\subsection{Configuration parameter list}
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\label{chap:config}
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Here is a complete list of all the {\em configuration} parameters known to {\sc SExtractor}.
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Many of them should be used with their default values. Please refer to the next sections for a
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detailed description of their meaning.
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% \begin{tabular}{lllp{2.5in}}
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\begin{tabbing}
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KKKKKKKKKKKKKK \= AAAAAAAAAAAAA \= VVVVVVVVVVVV \= \`TTTTTTTTTTTT \kill
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\parhead{Parameter }{ default }{ type }
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\parlist{ Description}\\
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%\hline
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\parhead{{\tt ANALYSIS\_THRESH} }{ {\tt 1.5} }{ {\em floats}\ $(n \le 2)$ }
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\parlist{ Threshold (in surface brightness) at
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which {\tt CLASS\_STAR} and {FWHM\_} \gam{why underscore?} operate. 1
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argument: relative to Background RMS (before filtering).
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2 arguments: surface magnitude $\mu$ ($\rm mag\,arcsec^{-2}$), Zero-point (mag).}\\
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\parhead{{\tt ASSOC\_DATA} }{ {\tt 2,3,4} }{ {\em integers}\ $(n\le
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32)$}
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\parlist{ \# of the columns in the
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{\tt ASSOC} file that will be copied to the catalogue output.}\\
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\parhead{{\tt ASSOC\_NAME} }{ {\tt sky.list} }{ {\em string} }
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\parlist{ Name of the {\tt ASSOC} ASCII file.}\\
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\parhead{{\tt ASSOC\_PARAMS} }{ {\tt 2,3,4} }{ {\em integers}\ $(2 \le n
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\le 3)$}
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\parlist{ \# of the columns in the {\tt ASSOC} file that will be used as coordinates
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and weight for cross-matching.}\\
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\parhead{{\tt ASSOC\_RADIUS} }{ {\tt 2.0} }{ {\em float} }
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\parlist{ Search radius (in pixels) for {\tt ASSOC}.}\\
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\parhead{{\tt ASSOC\_TYPE} }{ {\tt MAG\_SUM} }{ {\em keyword} }
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\parlist{ Method for cross-matching in {\tt ASSOC}:}\\
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\pararg {\tt FIRST} { -- keep values corresponding to the first match found,}
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\pararg{ \tt NEAREST} {values corresponding to the nearest match found,}
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\pararg{ \tt MEAN} {weighted-average values,}
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\pararg{ \tt MAG\_MEAN} {exponentially weighted-average values,}
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\pararg{ \tt SUM} {sum values,}
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\pararg{ \tt MAG\_SUM} {exponentially sum values,}
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\pararg{ \tt MIN} {keep values corresponding to the match with minimum weight,}
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\pararg{ \tt MAX} {keep values corresponding to the match with maximum weight.}
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\parhead{{\tt ASSOCSELEC\_TYPE} }{ {\tt MATCHED} }{ {\em keyword} }
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\parlist{ What sources are printed in the output catalogue in case of {\tt ASSOC}:}\\
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\pararg{ \tt ALL} {all detections,}
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\pararg{ \tt MATCHED} {only matched detections,}
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\pararg{ \tt -MATCHED} {only detections that were not matched.}
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\parhead{{\tt BACK\_FILTERSIZE} }{ {\tt 3} }{ {\em integers}\ $(n \le 2)$ }
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\parlist{ Size, or Width,Height (in background meshes) of the background-filtering mask.}\\
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\parhead{{\tt BACK\_SIZE} }{ {\tt 64} }{ {\em integers}\ $(n \le 2)$ }
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\parlist{ Size, or Width,Height (in pixels) of a background mesh.}\\
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\parhead{{\tt BACK\_TYPE} }{ {\tt AUTO} }{ {\em keywords}\ $(n \le 2)$}
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\parlist{ What background is subtracted from the images:}\\
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\pararg{ \tt AUTO} {the internal,
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automatically interpolated background map,}
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\pararg{ \tt MANUAL} {a user-supplied constant value provided in {\tt BACK\_VALUE}.}
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\parhead{{\tt BACK\_VALUE} }{ {\tt 0.0,0.0} }{ {\em floats}\ $(n \le 2)$ }
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\parlist{ in {\tt BACK\_TYPE MANUAL} mode, the constant value to be subtracted
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from the images.}\\
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\parhead{{\tt BACKPHOTO\_THICK} }{ {\tt 24} }{ {\em integer} }
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\parlist{ Thickness (in pixels) of the background {\tt LOCAL} annulus.}\\
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\parhead{{\tt BACKPHOTO\_TYPE} }{ {\tt GLOBAL} }{ {\em keyword} }
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\parlist{ Background used to compute magnitudes:}\\
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\pararg{ \tt GLOBAL} {taken directly from the background map,}
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\pararg{ \tt LOCAL} {recomputed in a ``rectangular annulus'' around the object.}
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\parhead{{\tt CATALOG\_NAME} }{ {\tt test.cat} }{ {\em string}
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}
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\parlist{ Name of the output catalogue. If the name ``{\tt STDOUT}'' is given and
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{\tt CATALOG\_TYPE} is set to {\tt ASCII}, {\tt ASCII\_HEAD}, {\tt ASCII\_SKYCAT}, or {\tt ASCII\_VOTABLE}, the catalogue will be piped to the standard output ({\em stdout})}\\
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\parhead{{\tt CATALOG\_TYPE} }{ --- }{ {\em keyword} }
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\parlist{ Format of output catalogue (note
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that ASCII\* is space and time consuming):}\\
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\pararg{ \tt ASCII} {ASCII table,}
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\pararg{ \tt ASCII\_HEAD} {as {\tt ASCII},
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preceded by a header containing information about the content,}
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\pararg{ \tt ASCII\_SKYCAT} {SkyCat ASCII format (WCS coordinates required),}
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\pararg{ \tt ASCII\_VOTABLE} {XML-VOTable format, together with meta-data,}
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\pararg{ \tt FITS\_1.0} {FITS format as in {\sc SExtractor} 1,}
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\pararg{ \tt FITS\_LDAC} {FITS ``LDAC'' format (the original image header is copied).}
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\parhead{{\tt CHECKIMAGE\_NAME} }{ {\tt check.fits} }{ {\em strings} $(n \le 16)$ }
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\parlist{ File name for each ``check-image''.}\\
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\parhead{{\tt CHECKIMAGE\_TYPE} }{ {\tt NONE} }{ {\em keywords} $(n \le 16)$}
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\parlist{ Type of information in the ``check-images'':}\\
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\pararg{ \tt NONE} {no check-image,}
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\pararg{ \tt IDENTICAL} {identical to input image (useful for converting formats),}
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\pararg{ \tt BACKGROUND} {full-resolution interpolated background map,}
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\pararg{ \tt BACKGROUND\_RMS} {full-resolution interpolated background noise map,}
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\pararg{ \tt MINIBACKGROUND} {low-resolution background map,}
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\pararg{ \tt MINIBACK\_RMS} {low-resolution background noise map,}
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\pararg{ \tt -BACKGROUND} {background-subtracted image,}
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\pararg{ \tt FILTERED} {background-subtracted filtered image (requires {\tt FILTER = Y}),}
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\pararg{ \tt OBJECTS} {detected objects,}
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\pararg{ \tt -OBJECTS} {background-subtracted image with detected objects blanked,}
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\pararg{ \tt APERTURES} {{\tt MAG\_APER} and {\tt MAG\_AUTO} integration limits,}
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\pararg{ \tt SEGMENTATION} {display patches corresponding to pixels attributed to each object.}
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\parhead{{\tt CLEAN} }{ {\tt Y} }{ {\em boolean} }
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\parlist{ If true, the
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catalogue is ``cleaned'' before being written to disk.}\\
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\parhead{{\tt CLEAN\_PARAM} }{ {\tt 1.0} }{ {\em float} }
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\parlist{ Efficiency of ``cleaning''.}\\
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\parhead{{\tt DEBLEND\_MINCONT} }{ {\tt 0.005} }{ {\em float} }
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\parlist{ Minimum contrast parameter for deblending.}\\
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\parhead{{\tt DEBLEND\_NTHRESH} }{ {\tt 32} }{ {\em integer} }
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\parlist{ Number of deblending sub-thresholds.}\\
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\parhead{{\tt DETECT\_MINAREA} }{ {\tt 5} }{ {\em integer} }
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\parlist{ Minimum number of pixels above threshold triggering detection.}\\
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\parhead{{\tt DETECT\_MAXAREA} }{ --- }{ {\em integer} }
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\parlist{ Maximum number of pixels
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above threshold triggering detection \gam{What value for infinity?}.}\\
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\parhead{{\tt DETECT\_THRESH} }{ {\tt 1.5} }{ {\em floats}\ $(n \le 2)$ }
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\parlist{ Detection threshold. 1 argument: (ADUs or relative to Background RMS, see
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{\tt THRESH\_TYPE}). 2
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arguments: $\mu$ ($\rm
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mag\,arcsec^{-2}$), Zero-point (mag).}\\
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\parhead{{\tt DETECT\_TYPE} }{ {\tt CCD} }{ {\em keyword} }
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\parlist{ Type of device that produced the image:}\\
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\pararg{ \tt CCD} {linear detector like CCDs or NICMOS,}
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\pararg{ \tt PHOTO} {photographic scan.}
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\parhead{{\tt FILTER} }{ --- }{ {\em boolean} }
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\parlist{ If true, filtering is applied to the data before extraction.}\\
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\parhead{{\tt FILTER\_NAME} }{ --- }{ {\em string} }
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\parlist{ Name of the file containing the filter definition.}\\
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\parhead{{\tt FILTER\_THRESH} }{ }{ {\em floats}\ $(n \le 2)$ }
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\parlist{ Lower and higher thresholds (in background standard deviations) for a pixel
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to be considered in filtering (used for retina-filtering only).}\\
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\parhead{{\tt FITS\_UNSIGNED} }{ {\tt N} }{ {\em boolean} }
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\parlist{ Force 16-bit FITS input data to be interpreted as unsigned integers.}\\
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\parhead{{\tt FLAG\_IMAGE} }{ {\tt flag.fits} }{ {\em strings}\ $(n \le 4)$ }
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\parlist{ File name(s) of the ``flag-image(s)''.}\\
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\parhead{{\tt FLAG\_TYPE} }{ {\tt OR} }{ {\em keyword} }
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\parlist{ Combination method for flags on the same object:}\\
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\pararg{ \tt OR} {arithmetical OR,}
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\pararg{ \tt AND} {arithmetical AND,}
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\pararg{ \tt MIN} {minimum of all flag values,}
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\pararg{ \tt MAX} {maximum of all flag values,}
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\pararg{ \tt MOST} {most common flag value.}
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\parhead{{\tt GAIN} }{ }{ {\em float} }
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\parlist{ ``Gain'' (conversion factor in $e^-/\mbox{ADU}$) used for error estimates
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of {\tt CCD} magnitudes .}\\
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\parhead{{\tt INTERP\_MAXXLAG} }{ {\tt 16} }{ {\em integers}\ $(n \le 2)$ }
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\parlist{ Maximum $x$ gap (in pixels) allowed in interpolating the input image(s).}\\
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\parhead{{\tt INTERP\_MAXYLAG} }{ {\tt 16} }{ {\em integers}\ $(n \le 2)$ }
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\parlist{ Maximum $y$ gap (in pixels) allowed in interpolating the input image(s).}\\
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\parhead{{\tt INTERP\_TYPE} }{ {\tt ALL} }{ {\em keywords}\ $(n \le 2)$ }
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\parlist{
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Interpolation method from the variance map(s) (or weight map(s)):}\\
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\pararg{ \tt NONE} {no interpolation,}
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\pararg{ \tt VAR\_ONLY} {interpolate only the variance map (detection threshold),}
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\pararg{ \tt ALL} {interpolate both the variance map and the image itself.}
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\parhead{{\tt MAG\_GAMMA} }{ }{ {\em float} }
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\parlist{ $\gamma$ of the emulsion (takes effect in {\tt PHOTO} mode only).}\\
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\parhead{{\tt MAG\_ZEROPOINT} }{ }{ {\em float} }
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\parlist{ Zero-point offset to be applied to magnitudes.}\\
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\parhead{{\tt MASK\_TYPE} }{ {\tt CORRECT} }{ {\em keyword} }
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\parlist{ Method of ``masking'' of neighbours for photometry:}\\
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\pararg{ \tt NONE} {no masking,}
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\pararg{ \tt BLANK} {put detected pixels belonging to neighbours to zero,}
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\pararg{ \tt CORRECT} {replace by values of pixels symetric with respect to the source center.}
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\parhead{{\tt MEMORY\_BUFSIZE} }{ {\tt 1024} }{ {\em integer} }
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\parlist{ Number of scan-lines in the image-buffer. Multiply by 4 the frame width to
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get equivalent memory space in bytes.}\\
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\parhead{{\tt MEMORY\_OBJSTACK} }{ {\tt 3000} }{ {\em integer} }
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\parlist{ Maximum number of objects that the object-stack can contain. Multiply by 300 to get
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equivalent memory space in bytes.}\\
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\parhead{{\tt MEMORY\_PIXSTACK} }{ {\tt 300000} }{ {\em integer} }
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\parlist{ Maximum number of pixels that the pixel-stack can contain. Multiply by 16 to 32 to get
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equivalent memory space in bytes.}\\
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\parhead{{\tt PARAMETERS\_NAME} }{ {\tt default.param} }{ {\em string} }
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\parlist{ The name of the file containing the list of parameters that will be computed and put
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in the catalogue for each object.}\\
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\parhead{{\tt PHOT\_APERTURES} }{ {\tt 5} }{ {\em floats}\ $(n \le 32)$ }
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\parlist{ Aperture diameters in pixels (used by {\tt MAG\_APER}).}\\
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\parhead{{\tt PHOT\_AUTOPARAMS} }{ {\tt 2.5,3.5} }{ {\em floats}\ $(n=2)$ }
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\parlist{ {\tt MAG\_AUTO} controls: scaling parameter $k$ of the 1st order moment, and minimum $R_{min}$
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(in units of {\tt A} and {\tt B}).}\\
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\parhead{{\tt PHOT\_AUTOAPERS} }{ {\tt 0.0,0.0} }{ {\em floats}\ $(n=2)$ }
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\parlist{ {\tt MAG\_AUTO} minimum (circular) aperture diameters: estimation disk, and
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measurement disk.}\\
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\parhead{{\tt PHOT\_FLUXFRAC} }{ {\tt 0.5} }{ {\em floats}\ $(n \le 32)$ }
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\parlist{ Fraction of {\tt FLUX\_AUTO} defining each element of the {\tt FLUX\_RADIUS} vector.}\\
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\parhead{{\tt PIXEL\_SCALE} }{ {\tt 1.0} }{ {\em float} }
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\parlist{ Pixel size in arcsec (for surface brightness parameters, FWHM and star/galaxy separation only).}\\
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\parhead{{\tt SATUR\_LEVEL} }{ {\tt 50000.0} }{ {\em float} }
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\parlist{ Pixel value above which it is considered saturated.}\\
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\parhead{{\tt SEEING\_FWHM} }{ {\tt 1.2} }{ {\em float} }
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\parlist{ FWHM of stellar images in arcsec (only for star/galaxy separation).}\\
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\parhead{{\tt STARNNW\_NAME} }{ {\tt default.nnw} }{ {\em string} }
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\parlist{ Name of the file containing the neural-network weights for star/galaxy separation.}\\
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\parhead{{\tt THRESH\_TYPE} }{ {\tt RELATIVE} }{ {\em keywords}\ $(n
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\le 2)$ }
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\parlist{ Meaning of the {\tt DETECT\_THRESH} and
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{\tt ANALYSIS\_THRESH} parameters:}\\
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\pararg{ \tt RELATIVE} {scaling factor to the background RMS,}
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\pararg{ \tt ABSOLUTE} {absolute level (in ADUs or in surface brightness).}
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\parhead{{\tt VERBOSE\_TYPE} }{ {\tt NORMAL} }{ {\tt keyword} }
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\parlist{ How much {\sc SExtractor} comments its operations:}\\
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\pararg{ \tt QUIET} {run silently,}
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\pararg{ \tt NORMAL} {display warnings and limited info concerning the work in progress,}
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\pararg{ \tt EXTRA\_WARNINGS} {like {\tt NORMAL}, plus a few more warnings if necessary,}
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\pararg{ \tt FULL} {display a more complete information and the principal parameters of all the objects
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extracted.}
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\parhead{{\tt WEIGHT\_GAIN} }{ {\tt Y} }{ {\em boolean} }
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\parlist{ If true, weight maps are considered as gain maps.}\\
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\parhead{{\tt WEIGHT\_IMAGE} }{ {\tt weight.fits} }{ {\em strings}\ $(n
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| 239 |
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\le 2)$ }
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| 240 |
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\parlist{ File name of the detection and measurement ``weight-image'', respectively.}\\
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| 241 |
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\parhead{{\tt WEIGHT\_TYPE} }{ {\tt NONE} }{ {\em keywords} $(n \le 2)$ }
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| 242 |
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\parlist{ Weighting scheme (for single image, or detection and
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| 243 |
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measurement images):}\\
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\pararg{ \tt NONE} {no weighting,}
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| 245 |
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\pararg{ \tt BACKGROUND} {variance map derived from the image itself,}
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| 246 |
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\pararg{ \tt MAP\_RMS} {variance map derived from an external RMS map,}
|
| 247 |
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\pararg{ \tt MAP\_VAR} {external variance map,}
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| 248 |
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\pararg{ \tt MAP\_WEIGHT} {variance map derived from an external weight map,}
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| 249 |
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\parhead{{\tt WRITE\_XML} }{ {\tt N} }{ {\em boolean} }
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| 250 |
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\parlist{ If true, meta-data will be written in XML-VOTable format.}\\
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| 251 |
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\parhead{{\tt XML\_NAME} }{ {\tt sex.xml} }{ {\em string} }
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| 252 |
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\parlist{ File name for the XML output of {\sc SExtractor}.}\\
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| 253 |
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\end{tabbing}
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| 254 |
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\gam{I still need to check if parameters are missing with {\tt sex -dd}.}
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| 255 |
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|
|
| 256 |
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\footnotetext[1]{Optional parameter}
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| 257 |
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