Information on Service 'GAVO Data Center SIAP Version 2 Service'

Further access options are discussed below

The GAVO Data Center's sitewide SIAP version 2 service publishes all the images published through the site. For more advanced queries including uploads, all this data is also available through ObsTAP.

For a list of all services and tables belonging to this service's resource, see Information on resource '__system__/siap2'

Overview

You can access this service using:

form -- an interface for web browsers through an HTML form
siap2.xml -- a standard SIAP version 2 interface as defined by the IVOA to access collections of celestial images; SIAP clients use http://dc.zah.uni-heidelberg.de/__system__/siap2/sitewide/siap2.xml? to access the service

Coverage

1.76043e-10 1.00083e+11 eV

1837.52 2031.43

This service is published as follows:

Within the set(s) ivo_managed with the renderer dali
Within the set(s) ivo_managed with the renderer siap2.xml

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

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
BAND	Wavelength	Wavelength interval that should intersect with the dataset coverage	N/A	N/A
CALIB	Calib. Level	Calibration level of the data (0=raw data .. 3=processed science-ready data)	N/A	N/A
COLLECTION	Collection	A name of a data collection within the service (use ObsTAP to find out the possible values).	N/A	N/A
DPTYPE	Type	Select either image or cube.	N/A	N/A
EXPTIME	Exposure Time	Lower and upper bound for the integration times of the observation	s	N/A
FACILITY	Facility	A name of a facility (usually a telescope) used to make the observation.	N/A	N/A
FORMAT	Format	Media type (like application/fits) or similar of the data product searched	N/A	N/A
FOV	Field of View	Lower and upper bound for the field of view of the observation	deg	N/A
ID	DID	A dataset identifier to match. Note that contrary to the SIAP v2 REC, we do not compare the IVOIDs case-insensitively. This should not be an issue if you got the IVOID from this service. For IVOIDs obtained in other ways, you may need to use ILIKE or a similar facility through ObsTAP.	N/A	N/A
INSTRUMENT	Instrument	A name of an instrument used to acquire the data.	N/A	N/A
maxrec	Match limit	Maximum number of records returned. Pass 0 to retrieve service parameters.	N/A	N/A
POL	Polarisation	Polarisation states as per Obscore (i.e., from the set I Q U V RR LL RL LR XX YY XY YX POLI POLA	N/A	N/A
POS	Position	A spatial constraint using SIAPv2 CIRCLE, RANGE, or POLYGON shapes and respective values in decimal degrees.	N/A	N/A
responseformat	Output Format	File format requested for output.	N/A	meta.code.mime
SPATRES	Spat. Res.	Lower and upper bound for the spatial resolution of the image(s)	deg	N/A
SPECRP	Res. Power	Lower and upper bound for the spectral resolving power λ/Δλ in spectrally resolved observations	N/A	N/A
TARGET	Target	A name of an observation target.	N/A	N/A
TIME	Time	Time interval that should intersect with the dataset coverage	N/A	N/A
TIMERES	Time res.	Lower and upper bound for the (absolute) resolution on the time axis	s	N/A
verb	Verbosity	Exhaustiveness of column selection. VERB=1 only returns the most important columns, VERB=2 selects the columns deemed useful to the average user, VERB=3 returns a table with all available columns.	N/A	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_estsize	Size	Estimated size of data product	kbyte	phys.size;meta.file
access_format	Media Type	MIME type of the resource at access_url	N/A	meta.code.mime
access_url	Access URL	The URL at which to obtain the data set.	N/A	meta.ref.url
calib_level	Calibration level	Amount of data processing that has been applied to the data Note calib	N/A	meta.code;obs.calib
dataproduct_type	Product type	High level scientific classification of the data product, taken from an enumeration	N/A	meta.code.class
em_max	λ_max	Maximal wavelength represented within the data set	m	em.wl;stat.max
em_min	λ_min	Minimal wavelength represented within the data set	m	em.wl;stat.min
em_res_power	λ/Δλ	Spectral resolving power lambda/delta lambda	N/A	spect.resolution
em_ucd	Spect. UCD	Nature of the product's spectral axis (typically, em.freq, em.wl, or em.energy)	N/A	meta.ucd
em_xel	\|λ\|	Number of elements (typically pixels) along the spectral axis.	N/A	meta.number
facility_name	Facility	Name of the facility at which data was taken	N/A	meta.id;instr.tel
instrument_name	Instrument	Name of the instrument that produced the data	N/A	meta.id;instr
o_ucd	Obs. UCD	UCD for the product's observable	N/A	meta.ucd
obs_collection	Collection	Name of a data collection (e.g., project name) this data belongs to	N/A	meta.id
obs_creator_did	Creator DID	Dataset identifier assigned by the creator.	N/A	meta.id
obs_id	Obs. Id	Unique identifier for an observation	N/A	meta.id
obs_publisher_did	Pub. DID	Dataset identifier assigned by the publisher.	N/A	meta.ref.ivoid
obs_title	Title	Free-from title of the data set	N/A	meta.title;obs
pol_states	Pol. States	List of polarization states in the data set	N/A	meta.code;phys.polarization
pol_xel	\|Pol\|	Number of elements (typically pixels) along the polarization axis.	N/A	meta.number
preview	Preview	URL of a preview (low-resolution, quick-to-retrieve representation) of the data.	N/A	meta.ref.url;meta.preview
s_dec	Dec	Dec of (center of) observation, ICRS	deg	pos.eq.dec
s_fov	FoV	Approximate spatial extent for the region covered by the observation	deg	phys.angSize;instr.fov
s_pixel_scale	Pix. Scale	Sampling period in world coordinate units along the spatial axis	arcsec	phys.angSize;instr.pixel
s_ra	RA	RA of (center of) observation, ICRS	deg	pos.eq.ra
s_region	coverage	Region covered by the observation, as a polygon	N/A	pos.outline;obs.field
s_resolution	Space Res.	Best spatial resolution within the data set	arcsec	pos.angResolution
s_xel1	\|X\|	Number of elements (typically pixels) along the first spatial axis.	N/A	meta.number
s_xel2	\|Y\|	Number of elements (typically pixels) along the second spatial axis.	N/A	meta.number
t_exptime	Exp. Time	Total exposure time	s	time.duration;obs.exposure
t_max	T_max	Upper bound of times represented in the data set	d	time.end;obs.exposure
t_min	Min. t	Lower bound of times represented in the data set	d	time.start;obs.exposure
t_resolution	Res. t	Minimal significant time interval along the time axis	s	time.resolution
t_xel	\|t\|	Number of elements (typically pixels) along the time axis.	N/A	meta.number
target_class	Target Class	Class of the target object (star, QSO, ...)	N/A	src.class
target_name	Target Name	Object a targeted observation targeted	N/A	meta.id;src

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
access_url	Access URL	The URL at which to obtain the data set.	N/A	meta.ref.url	1
s_ra	RA	RA of (center of) observation, ICRS	deg	pos.eq.ra	1
s_dec	Dec	Dec of (center of) observation, ICRS	deg	pos.eq.dec	1
dataproduct_type	Product type	High level scientific classification of the data product, taken from an enumeration	N/A	meta.code.class	5
obs_id	Obs. Id	Unique identifier for an observation	N/A	meta.id	5
obs_title	Title	Free-from title of the data set	N/A	meta.title;obs	5
obs_publisher_did	Pub. DID	Dataset identifier assigned by the publisher.	N/A	meta.ref.ivoid	5
access_format	Media Type	MIME type of the resource at access_url	N/A	meta.code.mime	5
access_estsize	Size	Estimated size of data product	kbyte	phys.size;meta.file	5
s_fov	FoV	Approximate spatial extent for the region covered by the observation	deg	phys.angSize;instr.fov	5
calib_level	Calibration level	Amount of data processing that has been applied to the data Note calib	N/A	meta.code;obs.calib	10
t_min	Min. t	Lower bound of times represented in the data set	d	time.start;obs.exposure	10
t_max	T_max	Upper bound of times represented in the data set	d	time.end;obs.exposure	10
t_exptime	Exp. Time	Total exposure time	s	time.duration;obs.exposure	10
em_min	λ_min	Minimal wavelength represented within the data set	m	em.wl;stat.min	10
em_max	λ_max	Maximal wavelength represented within the data set	m	em.wl;stat.max	10
s_xel1	\|X\|	Number of elements (typically pixels) along the first spatial axis.	N/A	meta.number	10
s_xel2	\|Y\|	Number of elements (typically pixels) along the second spatial axis.	N/A	meta.number	10
t_xel	\|t\|	Number of elements (typically pixels) along the time axis.	N/A	meta.number	10
em_xel	\|λ\|	Number of elements (typically pixels) along the spectral axis.	N/A	meta.number	10
pol_xel	\|Pol\|	Number of elements (typically pixels) along the polarization axis.	N/A	meta.number	10
s_pixel_scale	Pix. Scale	Sampling period in world coordinate units along the spatial axis	arcsec	phys.angSize;instr.pixel	10
obs_collection	Collection	Name of a data collection (e.g., project name) this data belongs to	N/A	meta.id	15
obs_creator_did	Creator DID	Dataset identifier assigned by the creator.	N/A	meta.id	15
target_name	Target Name	Object a targeted observation targeted	N/A	meta.id;src	15
s_region	coverage	Region covered by the observation, as a polygon	N/A	pos.outline;obs.field	15
s_resolution	Space Res.	Best spatial resolution within the data set	arcsec	pos.angResolution	15
t_resolution	Res. t	Minimal significant time interval along the time axis	s	time.resolution	15
em_res_power	λ/Δλ	Spectral resolving power lambda/delta lambda	N/A	spect.resolution	15
o_ucd	Obs. UCD	UCD for the product's observable	N/A	meta.ucd	15
pol_states	Pol. States	List of polarization states in the data set	N/A	meta.code;phys.polarization	15
facility_name	Facility	Name of the facility at which data was taken	N/A	meta.id;instr.tel	15
instrument_name	Instrument	Name of the instrument that produced the data	N/A	meta.id;instr	15
em_ucd	Spect. UCD	Nature of the product's spectral axis (typically, em.freq, em.wl, or em.energy)	N/A	meta.ucd	15
preview	Preview	URL of a preview (low-resolution, quick-to-retrieve representation) of the data.	N/A	meta.ref.url;meta.preview	15
target_class	Target Class	Class of the target object (star, QSO, ...)	N/A	src.class	20
dataproduct_subtype	Subtype	Data product specific type	N/A	meta.code.class	25
source_table	Source Table	Name of a TAP-queriable table this data originates from. This source table usually provides more information on the the data than what is given in obscore. See the TAP_SCHEMA of the originating TAP server for details.	N/A	meta.id;meta.table	25

Citation Info

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

Note calib

The calib_level flag takes the following values:

0	Raw Instrumental data requiring instrument-specific tools
1	Instrumental data processable with standard tools
2	Calibrated, science-ready data without instrument signature
3	Enhanced data products (e.g., mosaics)

Metadata

Identifier

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Keywords

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