- Form: FINDPEAK buf [MODEL=b] [LOC=r1,r2] [SPW=w] [SP=s1,s2]
[DLOC=dp] [INT] [COLS]
-
- MODEL=b
- Specifies a spectrum buffer where a model for the
curvature of the spectrum will be found.
- LOC=r1,r2
- specifies the approximate row upon which the peak lies.
If only one row is specified that row will be used as
the model for the peak search. If two rows are specified
a linear model will be used.
- SPW=w
- To specify a width for the box within which the peak
will be searched. See also SP=.
- SP=s1,s2
- specify a window (possibly asymmetric) around the model,
to find the peak. Two numbers row numbers must be given,
and are assumed to be relative to the model.
- DLOC=dp
- specifies a shift of d rows between model and peak
- INT
- Find the peak location only within a pixel. Otherwise,
the fractional location of the peak will be estimated
fitting a parabola around the peak.
- MEDIAN
- Finds the median row, rather than the peak, inside
the given limits.
- AREA=fa
- Rather than the peak or the median, finds the row at
which the cumulative counts reach a fraction fa of the
total (fa=.5 is equivalent to MEDIAN). This keyword is
analogous to the one in command ABX.
- COLS
- Finds the location of the peak or median at each row
rather than at each column
FINDPEAK maps the vertical (row-axis) location of the peak (maximum) down
each column of an image, or the horizontal (column-axis) location of the
peak running down each row using the COLS keyword. The mapping is done and
stored in a "spectrum" in an analogous fashion to the centroiding part of
command SPECTROID. The MEDIAN and AREA=fa allows for mapping not of the
location of the peak, but of the row at which a certain fractional area is
reached (the median in particular),