I’m trying to work out the differences between Single-Frame Processing in Level 1 and Level 2. Given that the DPDD only shows DIASource and image outputs for Level 1, I think that means the Level 1 Single Frame Processing is limited to just ISR and Image Characterization, or more precisely:
- ISR
- Defect / CR repair
- Detection of bright stars
- Basic PSF estimation
- Basic measurement
- Single-frame astrometric calibration
- Single-frame photometric calibration
- Background estimation
Where “basic” essentially means “only what’s necessary to do astrometric/photometric calibration”.
The Level 2 version needs to include all of the above, using slower but more careful algorithms for most of them, as well as:
- Detection to the single-epoch 5-sigma limit
- Full single-epoch meblending
- Full single-epoch measurement
In the parlance of our current Task
s, that pretty much means Level 1 is just CalibrateTask
and IsrTask
, while Level 2 is the full content of ProcessCcdTask
. Does that match everyone else’s understanding?