gfa_spots

Overview

The GFA spot positions from the FVC.

Creators

• PlateMaker testing and simulation
  • fvcsim

Users

This list is not promised to be comprehensive.

• internal to PlateMaker
  • fvcMatchMerge

Contents

Table columns

#	name	type	units	description
1	serial	integer
2	x_pix	float
3	y_pix	float
4	mag	float
5	pos_err	float
6	flag	int

Storage and access

Through DOS

After the seqid is set, the set and get PML commands may be used to provide PlateMaker with the targets, and retrieve them back if wanted.

First, a PML connection must be established:

>>> from DOSlib.PML import dos_connection
>>> pm = dos_connection('PLATEMAKER')
>>> pm.execute('configure')
'SUCCESS'

and some sample data loaded:

>>> from PlateMaker import test_data
>>> gfa_spots = test_data.gfa_spots

The data are stored in a numpy.recarray:

>>> gfa_spots.dtype
dtype((numpy.record, [('serial', '<i8'), ('x_pix', '<f8'), ('y_pix', '<f8'), ('mag', '<f8'), ('pos_err', '<f8'), ('flags', '<i8')]))

We need to set the seqid in PlateMaker to prepare it for working on a sequence:

>>> pm.execute('set', seqid=52254)
'SUCCESS'

Then we can set gfa_spots:

>>> pm.execute('set', gfa_spots=gfa_spots)
'SUCCESS'

and get them back:

>>> retrieved_gfa_spots = pm.execute('get', 'gfa_spots')

Preferred file representation

Name template:fvc-gfa-${SEQID}.dat Format:whitespace delimited ASCII text

Example file contents

::

>>> from PlateMaker import test_data
>>> fname = test_data.data_dir + '/fvc-gfa-52254.5.dat'
>>> print(open(fname, 'r').read()) 
#serial  x_pix  y_pix  mag  pos_err  flags
1101 532.567 -61.614 0. 0. 8
1109 200.032 284.161 0. 0. 8