Make a tutorial notebook for making templates with Gen3 Run3 DDF

[wmwv]

Make a template with the Gen3 Run3 DDF processing.

1. [ ] Show how to make a template for one patch
2. [ ] Discuss how to select images
3. [ ] Discuss how to scale up.

Some reference places to start:

• Bob Armstrong 2022 running Gen3 coadd+DIA on DC2 Run 2 https://docs.google.com/presentation/d/1bs3z6bqpAZ2WuSjpZOGuhgRnpz3Zd7ighkM-IDgk1dA/view
• Jim Chiang's 2021 running of Gen3 on DC2 Run 3 https://docs.google.com/presentation/d/1EO_UBVhISBrBussCsIvJhNVxSnyfg5z6yIPaz99gA0A/view#slide=id.gf546f83b40_0_59
• Guide to full ingestion and processing of HSC data in Gen3 https://hackmd.io/@lsk/merian#4-Create-a-new-butler

[wmwv]

@jchiang87 I'm using queryDatasets instead of queryDataIds, but now I don't get the tract anymore in the returned data_ref.dataId. How can I recover the tract information? The registry clearly knows.

for data_ref in butler.registry.queryDatasets(
    datasetType="calexp",
    collections=collection,
    instrument="LSSTCam-imSim",
    where=f"tract={tract} and skymap='DC2'",
):

I tried expanding it but neither of the following work:

data_ref.expanded(data_ref.dataId).full
butler.registry.expandDataId(data_ref.dataId).full

[jchiang87]

This is something I occasionally try to figure out, then give up after doing the obvious things. I haven't yet run into a case where I absolutely need the info that I think should be available in the expanded dataref, so I haven't tried to follow up. I guess this is a case to ask on slack in the appropriate #dm channel. #dm-newbies?

[wmwv]

I posted on Community

https://community.lsst.org/t/how-do-get-tract-patch-from-querydatasets-of-calexp/6467