How to consume TAP and SIAP for lightcurve survey ?

Sun Dec 23 03:31:39 PST 2012

Hi Petr, Pierre, all
Le 14/12/2012 08:49, Pierre Fernique a écrit :
> Bonjour Petr,
>
> Concerning Aladin questions.
>
> Unfortunately you are right about the lack of query time parameter in 
> VO protocols, notably in SIA. But it is quite easy to describe an 
> ad-hoc service taking into account the time scale, either as an 
> extension of SIA query parameters, or as a totally different service.
> If you have a HTTP image cutout service, you can describe the required 
> query parameters as a GLU record (see this section in the FAQ: 
> http://aladin.u-strasbg.fr/java/FAQ.htx#ToC63 and the example below). 
> Aladin will build automatically the corresponding form (in server 
> selector) and you will be able to query your image service by time.
>
> Obviously, the result stream must be understand by Aladin. So it can 
> be SIA, IDHA (old alternative of SIA), directly a resulting image 
> (FITS, JPEG...) or via a VOTable classical catalog with LINK system 
> pointing to your images. This last method is very close to your need 
> that you were describing by TAP result.
> In fact, I think that presently Aladin consumes TAP result as a 
> classical source catalog (if there are coordinates) at the difference 
> that the URLs in TAP will be just understood as "simple" http links => 
> will open your browser instead of loading the result into Aladin. You 
> could patch your TAP result by adding in the <FIELD> of your image 
> URLs the magic XML tag <LINK content-type="image/fits"/>. In this 
> case, Aladin should replace the simple link by button allowing you to 
> load the pointed image. See corresponding section in VOTable 1.2 recom 
> (in annexe section). I join to my mail a SIA result (I do not have TAP 
> example) patched as I described (removed all "VOX: ucd" for forcing 
> Aladin to load this VOTable as a classical catalog, and add the LINK 
> element). So you just have to load this file in Aladin (see screen 
> dump below).
>
> Another precision, in case of SIA result (not patched), you keep the 
> possibility to filter/sort the result tree. Click right on the result 
> and select "sort" option. It is clearly less flexible.
>
> About SIAPv2, please point me the recommandation. ;-)
>
There is a draft  since 3 years there:

http://wiki.ivoa.net/internal/IVOA/SiaInterface/WD-SIAP-2.0-20091104.pdf

This document has driven very little attention so far, but the situation 
is changing rapidly.
       - The  commitee of science priorities has identified SIAP2 to be 
a priority for radio data, radio cubes
       - Concrete discussions and decisions occured around the Sao Paulo 
meeting :
                      * reviewing the document from the radio point of 
view (JO Lazio did it and it was encouraging. Alma people - F.Stoehr- 
allready had a look before)
                      * groups engagig to prototype SIA servers before 
next interop.
                                 - Spanish VO (Enrique)
                                 - VAO, NRAO
                                 - CDS, via a trainee starting en January
        - Interfacing a SIA2 prototype to Aladin is possible by the very 
same technics described by Pierre here and has allready been tested. 
There is no problem on the client side, I think.

Best regards and Happy christmas to everybody
François
> Cheers
> Pierre
>
> --
>
>
> ---
> Example of GLU record for a SIA service with one additionnal query 
> parameter.
>
> %A    MAST
> %D    Multimission Archive at STScI (MAST)
> %U 
> http://archive.stsci.edu/siap/search2.php?FORMAT=image/fits&POS=$1,$2&SIZE=$3,$4&ID=$5
> %P.D  1:Right Ascension
> %P.D  2:Declination
> %P.D  3:Width (deg)
> %P.D  4:Height (deg)
> %P.D  5:mission/instrument
> %P.K  1:Target(RAd)
> %P.K  2:Target(DEd)
> %P.K  3:Field(RAd)
> %P.K  4:Field(DEd)
> %P.V  3:0.17
> %P.V  4:0.17
> %R    Mime(sia/xml)
> %Aladin.Menu Archives...
> %Aladin.Label Multimission Archive at STScI (MAST)
> %Aladin.LabelPlane MAST $4
>
>
> Le 14/12/2012 03:31, Petr Skoda a écrit :
>>
>> Hi all,
>>
>> We are going to prepare a survey of several fields in SMC and LMC 
>> which will be observed many times and then to extract the lightcurves 
>> from all of the images in a semi-automatic manner. This means 
>> identify all stars in an image according to their PSF shape, make 
>> astrometry, make an aperture photometry and convert counts to fluxes 
>> using identified standard stars and their magnitudes from UCAC4.
>>
>> The archive will have all available metadata published using TAP 
>> Obscore, the info about stars - ie. position in ICRS and flux in 
>> physical units will be available through TAP and used to construct 
>> the lightcurve relaying on "precise" positions of stars - by 
>> preparing SQL query something like - give me all fluxes of stars in 
>> circle/rectangle of given small size at given ICRS coordinates in 
>> given filter ordered by MJD.
>>
>> The resulting point of the lightcurve will be somehow wrapped to the 
>> form of SDM-like table able to be visualized by e.g. SPLAT or VOPLOT.
>>
>> But we want also to access the images of given fields and make 
>> cutouts of given region using SIAP
>>
>> With this idea is, however, unclear a lot of issues....
>> All you suggestions are welcome!
>>
>> 1) in SIAP there is only input parameter for location and optional 
>> image generation parameters - I cannot select band and mainly the TIME !
>> So far all SIAP examples I have found in literature are just showing 
>> the selection of given field on sky - but not temporal filter or 
>> spectral filter
>>
>> It is written the SIAP (v1.0)  can provide optional parameters 
>> server-dependent.
>> I am sure the time and filter (band) is so important that someone had 
>> already to solve this problem - can you point me to SIAP service 
>> implementing his ?
>>
>> Another question concerns Aladin - or is there another SIAP enabled 
>> viewer ?
>>
>> How to filter in Aladin query the bands or time ? I have just seen 
>> the SIAP are returning tree structure where the band is written but 
>> not time - i.e. even if I cant restrict the serarch by query 
>> parameters I can at least select right filter from returned results - 
>> I would like to do it for time (HJD) as well.
>>
>> Suppose I will display image in Aladin using SIAP. I want to overlay 
>> the identified objects in it which I have written in a table. How to 
>> do it ?
>> Can I display the content of TAP table ? Or how the catalogue 
>> services in Aladin is consumed ? a ConeSearch only ? But how to 
>> restrict it to given filter band ? Or time ?
>>
>> Suppose we would implement the SIAPv2.0 service according the draft. 
>> Will there be SIAPv2.0 compatible visual tool ? Will the Aladin 
>> support SIAPv2.0 soon ?
>>
>>
>> best regards,
>>
>> Petr Skoda
>>
>> ************************************************************************* 
>>
>> *  Petr Skoda                         Phone : +420-323-649201, ext. 
>> 361 *
>> *  Stellar Department                         
>> +420-323-620361           *
>> *  Astronomical Institute AS CR       Fax   : 
>> +420-323-620250           *
>> *  251 65 Ondrejov                    e-mail: 
>> skoda at sunstel.asu.cas.cz  *
>> *  Czech 
>> Republic                                                       *
>> ************************************************************************* 
>>
>

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