Erin Sheldon

Calculate centers

7

This adds code to calculate centers from shot photons These positions will be accurate in all cases, whereas the current available x, y are from converting ra, dec to x,...

New WCS type?

5

The current WCS output does not include all the physics, so it is quite far off for some cases, such as when DCR is on. I've got a PR #461...

instance catalog read twice

7

I'm seeing that instance catalogs are read twice. When galaxies are present its taking about 20minutes to read the catalog, so doubling this is significant. Below I added a timer...

feature request: Output image background level and variance

8

I'm interested in having the background and background variance (since it may not be pure poisson) output in the image header for the "eimage" type. The motivation is to enable...

Docs for conda based install missing IMSIM_HOME environment variable

1

https://github.com/LSSTDESC/imSim/blob/345a7cc3307ce44b0e560efc0a68344523c18dbe/doc/install.rst?plain=1#L183 I believe there is a line missing here, something like ```bash conda env config vars set IMSIM_HOME="directory containing the imSim github repo as a sub-directory" ```

Setting nproc

9

I have `output.nproc: 1` but galsim is using 2 cores. I can get it down to 1 core by setting OMP_NUM_THREADS to 1.

numerical issue for some realizations of atmosphere

29

I'm seeing large offsets in the photon `x, y` values, as well as the occasional `nan`, for some realizations of an atmosphere. The offsets can be very high, like 10...

The pip install is failing if bzip or curl are not available. There is a check in setup.py for this that must have stopped working

We will need to support writing these. For reading, I think this may be equivalent to what we are doing with object arrays for most use cases, but it has...