| | 7 | |
| | 8 | Over the past few weeks, we have been working on issues outstanding before we start the Grand Reprocessing. In addition, I have been working on the psphotStack analysis needed to generate the stack photometry & morphology data products needed by PSPS. |
| | 9 | |
| | 10 | The major impediment at the moment on the GR work is in finalizing the static masks based on the detrend and non-linearity modifications of the last couple months. The IPP team have created an initial set of static masks, and over the holiday period, Heather has been leading the effort to test those masks. At this point, the testing has run into some difficulty because of the enhanced magic rates from the current code base. It is clear that we need to solve that issue before we can finalize the masks. |
| | 11 | |
| | 12 | Before the Holidays, I was concentrating on the PSPS output issues. I finished modifications to psphotStack so that it performs the full set of photometry and morphology analyses on the input images. It then generates a series of PSF-matched image sets with multiple target PSFs, and performs the radial-aperture photometry analysis on these PSF-matched images. I provided Roy with examples of these data products from simulated data. |
| | 13 | |
| | 14 | Last week, I created a set of tests scripts to verify the image processing outputs from simulated raw data through the stack process. Using this test suite, I was able to track down the bug causing the detection efficiency error. It appears that the 7/15 modification to the variance and covariance scaling missed an important factor in the detection efficiency analysis (which was included in the actual detection analysis). The implication of the bug is that the reported detection limits values since 8/23 (when the bug took effect) have been in error by nearly 2 magnitudes (ie, it is the reported limit that is in error; the actual detection efficiency was not impacted). In exploring this bug, I also discovered a bug that let psphot drop moderately near neighbors to brighter stars. This bug results in reduced efficiency as crowding increases. |
| | 15 | |
| | 16 | I have since been pursuing the magic error introduced in the 8/23 release which results in too many magic streaks. I suspect that this is similar to the covariance scaling error mentioned above, but I have not yet been able to prove it. |
