DEPSIM(1)



NAME

     depsim_limb depsim_tbl depsim_crop depsim_vwbin depsim_rwbin

     strategy modules to emulate  the  calculations  by  the  MDI
     Dedicated  Experiment  Processor  (DEP)  of  tables  used in
     onboard image processing


SYNOPSIS

     depsim_limb  [-a] [argument= value ...]
      etc.


DESCRIPTION

     The set of modules depsim_* simulate the calculations by the
     MDI  Dedicated Experiment Processor (DEP) of the tables used
     in onboard image processing.  Each produces  a  table  func-
     tionally  identical to the tables used in the onboard calcu-
     lations.  depsim_limb produces the appropriate  binlist  for
     extraction  of the annulus of pixels to be used for analysis
     of the figure of the solar limb.   depsim_tbl  produces  the
     two lookup tables of reciprocals and square roots normalized
     for 16-bit arithmetic.

     The output data tables are normally placed  in  tables  with
     the  same  format  as the (Level 0) MDI internal tables.  If
     the -a flag is specified, formatted ASCII data are addition-
     ally sent to the history channel.

     The output of depsim_limb is a FITS file with similar struc-
     ture  to  the  limb-mask  tables.   The DPC is set to 0, the
     OP_code to 376, and the ``Reference Time'' to  the  time  of
     execution of the module.

     In the formatted ASCII limb table produced  by  depsim_limb,
     each  line  contains  two  integers  representing the column
     number and row number of an  included  pixel,  respectively.
     The lines are ordered in the same order that data pixels are
     extracted.


ARGUMENTS

     out=name            The output dataset name.

     xctr=float

     yctr=float          The x (column) and y  (row)  coordinates
                         of  the  presumed  center  of  the solar
                         disc, specified in units  of  the  pixel
                         width  and  measured  from the center of
                         the cornermost pixel of the field.   The
                         coordinates  of  the center of pixel (n,
                         m) are thus (n, m) and  the  coordinates
                         of   a   disc   exactly  centered  in  a
                         1024*1024-pixel field would  be  (511.5,
                         511.5).   These  arguments  are required
                         for      depsim_limb,       depsim_crop,
                         depsim_vwbin,  and  depsim_rwbin.   Note
                         that the values will be rounded  to  the
                         nearest  1/8 of a pixel width.  Default:
                         (511.5, 511.5).

     rinner=float

     router=float        Values to be used by depsim_limb for the
                         desired  inner  and outer radii, respec-
                         tively, of the annulus, in units of  the
                         pixel size.  Note that the desired radii
                         will be rounded to the nearest 1/8 of  a
                         pixel   width.    Defaults:   rinner   =
                         477.625, router = 483.625.


EXAMPLES


FILES


SEE ALSO


DIAGNOSTICS


BUGS

     depsim_limb is the only individual  module  that  exists  so
     far.

     The ways of distinguishing the binary output of the  simula-
     tor  from  real  downloaded  tables  (e.g.  the  DPC and the
     recording of the Reference Time attribute in  Pacific  Stan-
     dard Time) may not be appropriate.

     The use of the -a flag is discouraged.


AUTHOR

     Rick Bogart


HISTORY

     1995-11-19      SOI Version 1.1