Information on Service 'Simple Image Access for ALMA FITS'

Further access options are discussed below

The resource contains the recommendations and requirements for ALMA FITS products of the Inter-ARC ALMA Science Archive Working Group (ASAWG) with the view to including a metadataset that is complete and easily accessible by the ChiVO Data Provider (CDP).

For a list of all services and tables belonging to this service's resource, see Information on resource 'ChiVO Data Provider for ALMA FITS'

Overview

You can access this service using:

siap.xml -- a standard SIAP interface as defined by the IVOA to access collections of celestial images; SIAP clients use https://vo.chivo.cl/alma_fits/q/siap-alma-fits/siap.xml? to access the service
form -- allows access via an HTML form

This service is published as follows:

Within the set(s) local with the renderer form
Within the set(s) ivo_managed,local with the renderer siap.xml
Within the set(s) ivo_managed with the renderer tap

local means it is listed on our front page, ivo_managed means it has a record in the VO registry.

Other services provided on the underlying data include:

Simple Cone Search for ALMA FITS

Input Fields

The following fields are available to provide input to the service (with some renderers, some of these fields may be unavailable):

Name	Table Head	Description	Unit	UCD
FORMAT	Output format	Requested format of the image data	N/A	N/A
hFORMAT	Output format	Requested format of the image data	N/A	N/A
hINTERSECT	Intersection type	Relation of image and specified Region of Interest.	N/A	N/A
hPOS	Position	ICRS Position, RA,DEC, or Simbad object (e.g., 234.234,-32.45)	deg	pos.eq
hSIZE	Field size	Size in decimal degrees (e.g., 0.2 or 1,0.1)	deg	N/A
INTERSECT	Intersection type	Relation of image and specified Region of Interest.	N/A	N/A
POS	Position	ICRS Position, RA,DEC decimal degrees (e.g., 234.234,-32.46)	deg	pos.eq
SIZE	Field size	Size in decimal degrees (e.g., 0.2 or 1,0.1)	deg	N/A

Default Output Fields

The following fields are contained in the output by default. More fields may be available for selection; these would be given below in the VOTable output fields.

Name	Table Head	Description	Unit	UCD
access_url	URL Download.	URL of the data file.	N/A	meta.ref.url;meta.main
file_name	Name File	Name of the file FITS.	N/A	meta.id;meta.file;meta.main
mous	MOUS	Member observing unit set status uid.	N/A	meta.mous;meta.main
naxis	NAXIS	Number of axes in the associated data array.	N/A	pos.wcs.naxis;meta.main
naxisn	NAXISn	Number of elements along axis n of a data array (n = 1-NAXIS). ASA data must have four NAXIS terms.	N/A	pos.wcs.naxisn;meta.main
obsgeo_x	OBSGEO-X	Xâcoordinate in cartesian geocentric terrestrial reference frame, specifying the location the observation took place at time given in MJD-AVG.	N/A	pos.cartesian.x;meta.main
obsgeo_y	OBSGEO-Y	Yâcoordinate in cartesian geocentric terrestrial reference frame, specifying the location the observation took place at time given in MJD-AVG.	N/A	pos.cartesian.y;meta.main
obsgeo_z	OBSGEO-Z	Zâcoordinate in cartesian geocentric terrestrial reference frame, specifying the location the observation took place at time given in MJD-AVG.	N/A	pos.cartesian.y;meta.main
s_dec	DEC	The Declination coordinate of image center, in the in the system specified in EQUINOX and RADESYS.	N/A	pos.eq.dec;meta.main
s_ra	RA	The Right Ascension coordinate of image center, in the system specified in EQUINOX and RADESYS.	N/A	pos.eq.ra;meta.main
target_name	Target Name	Name for source observed.	N/A	meta.id;meta.main

VOTable Output Fields

The following fields are available in VOTable output. The verbosity level is a number intended to represent the relative importance of the field on a scale of 1 to 30. The services take a VERB argument. A field is included in the output if their verbosity level is less or equal VERB*10.

Name	Table Head	Description	Unit	UCD	Verb. Level
centerAlpha	Ctr. RA	Approximate center of image, RA	deg	POS_EQ_RA_MAIN	0
centerDelta	Ctr. Dec	Approximate center of image, Dec	deg	POS_EQ_DEC_MAIN	0
imageTitle	Title	Synthetic name of the image	N/A	VOX:Image_Title	0
dateObs	Obs. date	Epoch at midpoint of observation	d	VOX:Image_MJDateObs	0
accref	Product key	Access key for the data	N/A	N/A	1
access_url	URL Download.	URL of the data file.	N/A	meta.ref.url;meta.main	1
bandpassId	Bandpass	Freeform name of the bandpass used	N/A	VOX:BandPass_ID	10
target_name	Target Name	Name for source observed.	N/A	meta.id;meta.main	10
file_name	Name File	Name of the file FITS.	N/A	meta.id;meta.file;meta.main	10
naxis	NAXIS	Number of axes in the associated data array.	N/A	pos.wcs.naxis;meta.main	10
naxisn	NAXISn	Number of elements along axis n of a data array (n = 1-NAXIS). ASA data must have four NAXIS terms.	N/A	pos.wcs.naxisn;meta.main	10
date_obs	DATE-OBS	Observation start time.	N/A	time.epoch;meta.main	10
s_ra	RA	The Right Ascension coordinate of image center, in the system specified in EQUINOX and RADESYS.	N/A	pos.eq.ra;meta.main	10
s_dec	DEC	The Declination coordinate of image center, in the in the system specified in EQUINOX and RADESYS.	N/A	pos.eq.dec;meta.main	10
specsys	SPECSYS	Reference frame for freq axis.	N/A	pos.eq.specsys;meta.main	10
radesys	RADESYS	Name of the reference frame of equatorial or ecliptic coordinates.	N/A	pos.eq.radesys;meta.main	10
restfrq	RESTFRQ	ontingent on the type of measurements being made: For transition line measurements: the rest frequency of the of the spectral feature of interest in Hz. For continuum measurements: the centre of the band of the spectral window.	N/A	pos.eq.restfrq;meta.main	10
accsize	File size	Size of the data in bytes	byte	VOX:Image_FileSize	11
pixelScale	Scales	The pixel scale on each image axis	deg/pix	VOX:Image_Scale	12
instId	Instrument	Identifier of the originating instrument	N/A	INST_ID	15
pixelSize	Axes Lengths	Number of pixels along each of the axes	pix	VOX:Image_Naxis	15
obsgeo_x	OBSGEO-X	Xâcoordinate in cartesian geocentric terrestrial reference frame, specifying the location the observation took place at time given in MJD-AVG.	N/A	pos.cartesian.x;meta.main	15
obsgeo_y	OBSGEO-Y	Yâcoordinate in cartesian geocentric terrestrial reference frame, specifying the location the observation took place at time given in MJD-AVG.	N/A	pos.cartesian.y;meta.main	15
obsgeo_z	OBSGEO-Z	Zâcoordinate in cartesian geocentric terrestrial reference frame, specifying the location the observation took place at time given in MJD-AVG.	N/A	pos.cartesian.y;meta.main	15
mous	MOUS	Member observing unit set status uid.	N/A	meta.mous;meta.main	15
gous	GOUS	Group observing unit set status uid.	N/A	meta.gous;meta.main	15
lonpole	LONPOLE	Longitude in the coordinate system of celestial systemâs north pole.	N/A	meta.lonpole;meta.main	15
latpole	LATPOLE	Latitude in the coordinate system of celestial systemâs north pole.	N/A	meta.latpole;meta.main	15
instrument_name	INSTRUME	The receiver band used for the image observations.	N/A	meta.id;instr;meta.main	15
mime	Type	MIME type of the file served	N/A	N/A	20
nAxes	#axes	Number of axes in data	N/A	VOX:Image_Naxes	20
refFrame	Ref. Frame	Coordinate system reference frame	N/A	VOX:STC_CoordRefFrame	20
wcs_equinox	Equinox	Equinox of the given coordinates	yr	VOX:STC_CoordEquinox	20
wcs_projection	Proj.	FITS WCS projection type	N/A	VOX:WCS_CoordProjection	20
wcs_refPixel	Ref. pixel	WCS reference pixel	pix	VOX:WCS_CoordRefPixel	20
wcs_refValues	Ref. values	World coordinates at WCS reference pixel	deg	VOX:WCS_CoordRefValue	20
wcs_cdmatrix	CD matrix	FITS WCS CDij matrix	deg/pix	VOX:WCS_CDMatrix	20
bandpassUnit	Bandpass unit	Unit of bandpass specifications (always m).	N/A	VOX:BandPass_Unit	20
bandpassRefval	Band Ref.	Characteristic quantity for the bandpass of the image	m	VOX:BandPass_RefValue	20
bandpassHi	Band upper	Upper limit of the bandpass (in BandPass_Unit units)	m	VOX:BandPass_HiLimit	20
bandpassLo	Band lower	Lower limit of the bandpass (in BandPass_Unit units)	m	VOX:BandPass_LoLimit	20
pixflags	P. Flags	Flags specifying the processing done (C-original; F-resampled; Z-fluxes valid; X-not resampled; V-for display only	N/A	VOX:Image_PixFlags	20
coverage	Coverage	Field covered by the image	deg	N/A	20
owner	Owner	Owner of the data	N/A	N/A	25
embargo	Embargo ends	Date the data will become/became public	a	N/A	25

Copyright, License, Acknowledgements

MIT License.

VOResource XML (that's something exclusively for VO nerds)