URL to access images via SIA

Support Data Products
#1

It seems like I can query the source catalogs from outside RSP via a specified TAP URL (https://data.lsst.cloud/api/tap). However, if I want to do the same for images/image cutouts, tools like pyvo seem to provide a way to do it via SIA/SIA_v2, but I couldn’t find the SIA endpoint (similar to TAP) on the public documentation. Querying all the available endpoints on IVOA doesn’t seem to suggest anything related to LSST.

Can you please specify the endpoint that we need to be querying (from within the RSP, it is dubbed “dp1”, but I am looking for a specific endpoint that this is an alias of) to get images? That would be great and very helpful.

Thank you,

Akash

#2

Hi @aakash , absolutely. The SIA endpoint for DP1 is https://data.lsst.cloud/api/sia/dp1/query. I’ll get that added to the documentation.

I’m going to mark this post as the solution because I’m pretty sure that’s what you need but please don’t hesitate to report back.

#3

We are not yet listing our services in the VO registries but we do intend to do that in the future.

I can confirm that I have been able to use TOPCAT to query the SIA service, and with a new beta release of TOPCAT, click on the results and load images directly into Aladin Desktop.

1 Like
#4

I believe there was also a question about cutouts. The endpoint for that is
https://data.lsst.cloud/api/cutout

#5

You can find the image themselves via TAP, by searching the ivoa.ObsCore table on the TAP service (this is sometimes referred to as “ObsTAP”).

Both the SIAv2 and ObsTAP paths will return explicit data pointing you to the cutout service for the images you’ve selected, following the IVOA DataLink standard.