

POS1 astrometric package in Midas

This package corresponds to RM West's POS1. The input/output have been
made compatible with Midas, but the algorithm has not been changed (as
it proved to be extremely accurate, this would have been masochism).

While the original POS1 was doing everything in one programme, the
Midas version has been split in 3 steps:
  1* read the measurements and standard stars, and compute the
     transformation parameters (this step is performed by the POS1A
     prog, or ASTROMETRY/TRANSFO)
  2* edit the standard star table to remove/restore some stars (this
     step is performed by the RESIDUAL.PRG or ASTROMETRY/EDIT)
  3* actually compute the converted coordinates (this step is
     performed by the POS1B programme or ASTROMETRY/COMPUTE)
Steps 1 and 2 can be iterated until a satisfactory result is obtained.
The whole process can be performed in an iterative way that mimics the
former POS1 calling the POS1.PRG programme (ASTROMETRY/POS1); the user
will be asked for all the parameters.

You should get in this directory:

READ.ME:   	This file

pos1.prg	ASTROMETRY/POS1
pos1a.prg	ASTROMETRY/TRANSFO
pos1b.prg	ASTROMETRY/COMPUTE
residual.prg	ASTROMETRY/EDIT
init_pos1.prg	defines the commands

pos1a.f		FORTRAN progr.
pos1b.f
mean.f		FORTRAN subr.
blinkxy.f 
adcon.f 
adxy.f 
qkdin.f 
rar.f 
xyad.f

makefile	Makefile...

astr_tran.hlp	ASTROMETRY/TRANSFO help file (ASCII)
astr_edit.hlp	ASTROMETRY/EDIT help file (ASCII)
astr_comp.hlp	ASTROMETRY/COMPUTE help file (ASCII)

ppm300.tbl	Example of  a Midas table with std stars
xy300.tbl	                               xy measurements
pos1.exp                    an execution of pos1 using these table
out300.tbl      result of this example.

