Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.atnf.csiro.au/computing/software/gipsy/tsk/plate.dc1 Дата изменения: Mon Dec 19 19:08:45 1994 Дата индексирования: Fri Jan 16 00:07:48 2009 Кодировка: Поисковые слова: comet tail

Program: PLATE

Purpose: snips raw data from tape(s) to custom plate

Category: IRAS

Author: Do Kester

File: plate.src

Keywords:

INSTRUME= give instrument identification []
a combination of observation mode
SURVEY SPLINE AO PO FLASH UNKNOWN
and band number
12 25 60 100 LRS BPHF 1 2 3 4
( 2 letters suffice )
PO is an alias for AO; AOs, POs and UNKNOWNs are
collectively known as pointed observations.

CENTER= give the central longitude and latitude of the plate

SIZE= give (long. and lat.) size of the plate [1.0]

COOR= give coordinate system [EQUATORIAL 2000]
standard coordinate systems are:
EQUATORIAL 2000.0
GALCTIC
ECLIPTIC 2000.0
SUPERGALACTIC
SUNREFERENCED sun at lambda=0.0
( 3 letters suffice )

If the second item cannot be read the system will ask

EPOCH= give epoche pertaining to COOR [2000.0]

If the coordinate system is unknown the program asks whether you
want to make a new system, if not you get a retry.

*** CONFIRM= I want a new system [yes]

If yes, the system asks for 3 angles and a reference system:

*** POLEDIST= give distance between the poles in degrees [0.0]
of the reference coordinate system and
the coordinate system to be defined

*** REFNODE= give long. of the asc. node in the ref. system [0.0]

*** NEWNODE= give long. of the asc. node in the new system [0.0]

*** COOR= give ref. coordinate system [EQUATORIAL 2000]

IRSET= give set name to write to [no snip action]

If the set already exists the program asks for

STATUS= it already exists: choose merge, error or [overwrite]
( 1 letter suffices )

OBJECT= give name of the object [no name]

OBSERVER= give name of the observer [no name]

*** FLASHTIMES= number of secs to cut from the beginning and end of the scans.
[32,20]
In case of AO or Unknown the flashtimes are set to 0,0
by default.

*** SOPATT= select only this sop/att combination
Zero, one or two items can be given here. Depending on the
selected instrument the following happens:

instrume items in
SOPATT=

survey 0 normal case, no list is displayed
select all scans overlapping the plate

1 display list of all overlapping scans
request further selection with SOPATT=

2 no list is displayed
select only the scan indicated with SOPATT=

AO or 0 display list of all overlapping scans
unknown select the first scan in the list

1 display list of all overlapping scans
ask again for one SOPATT=

2 no list is displayed
select only the scan indicated with SOPATT=

Note that survey scans are snipped to the plate size; Use
MINTICK= to get a full sized scan.
Note also that the pointed observations are NOT snipped at all.
Except for the display of the list the central position is
irrelevant.

*** SKIPTICK= skip snips with a overlap length shorter than [2] ticks

*** MINTICK= make snips of a minimum length of [2] ticks
This action is performed after the skip, so that
one can throw away too short snips and make all
others of a minimum length, with the selected
area as much as possible in the center of the snip.
Full scans are selected with MINTICK=6000 (or larger).
NB. Due to flashes at begin or end of a scan some
snips may actually turn out shorter.
Description:

PLATE builds an IRAS Data Structure (IRDS) for a particular
area (custom plate) from the optical disc server.
For the definition of an IRDS see IRAS User Manual SWG-ROG 90 003.

The custom plate is defined by an area on the sky: keyword CENTER,
SIZE and COOR, and keyword INSTRUME which defined the observation mode
and the band number. Only scan(snip)s which pertain to the same area
and instrument can be stored in the same IRDS. The area is called the
custom plate.

The unsnipped data are stored on digital optical discs which reside
in a jukebox like server.

With IRSET the name of the IRDS is queried.
If IRSET is presented with an existing IRDS
it is asked whether it is an error, or to overwrite it, or to merge
the new data with this existing one. In this way an existing IRDS
can be enlarged. Note that if this IRDS is on quite a different
location as the one requested by CENTER, SIZE and COOR, two unrelated
custom plates are stored in one IRDS. It is not clear what the use of
such a set is.

Where the beginning or the end of a scan falls within the custom plate
the snip starts later or ends earlier by a number of seconds given
with FLASHTIMES. The first number pertains to the beginning and the
second to the ending of the scans. In this way the flashes at the
start and end of each scan are avoided. AO's have no flashes at the
beginning and end of the scans. For them the FLASHTIMES are by default 0.

When sop/att selection is asked either by default for pointed
observations or if the keywords SOPATT received some input
( the answer 0 will do the trick ) a list of sop/att combinations
which are present in the selected area is made and the user is asked
to select from this list. Selection can only be done in increasing order.

Some data around data outages were discovered to be corrupt. Those
parts are put to the GIPSY blank value.

Updates: 900105 DK, documentation only
900327 DK, creation of code
910308 DK, add noise estimate on snip-detector level
910912 DK, adapted for the optical disc server
920218 DK, blank out corrupt data
920225 DK, list available sop-att's if sop/att selection
920225 DK, put flashtimes=0 0 by default for AO's
920226 DK, SCANTYPE is added to the header at snip-level
920227 DK, proper handling of crippled irds's
930330 DK, add UNKNOWNs and PO as alias for AO
931019 DK, allow single scan selection
940419 DK, repaired obscure bug in string handling