Coordinate system in ADQL

[gilles landais]

Dear IVOA members !

Following the last IVOA meeting and about the new ADQL version.


Coordinate System had been deprecated from the ADQL region. This 
capability was may be not very used, and was may be ambiguous. However 
to change the coordinate system was used in VizieR.


Moreover, there is not today a pivot coordinate system used for all 
tables in all data-centers. I am agree that coordinate System could be 
an option, but in my opinion, to remove it without any alternatives will 
impoverish ADQL.


If coordinate system in option is rejected, we could also add a function 
such as the function proposed by Markus in Gavo to make possible the 
change of coordinate System:

gavo_transform(from_sys TEXT, to_sys TEXT, geo GEOMETRY) -> GEOMETRY


So, I ask IVOA people to consider this capability as a ADQL standard (as 
a function - may be optional).


Regards,

Gilles Landais (CDS)

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