| | 8 | I have been working on psphotStack, the program which performs the photometry and morphology analysis of the stacks. The output from this program is the main item required to finish off the IPP->PSPS interface for the stacks. There have been a number of pieces of metadata missing that are needed by PSPS. To get that metadata in place, I needed to modify ppStack as well, to pass the information from the input warps and the analysis to the stack, so that psphotStack has the needed data. There were also a couple of implementation issues that needed to be resolved. First, the original implementation did not include the possibility of having more than one set of PSF-matched images (for the radial aperture fluxes). I realized that additional PSF-matched images can be generated from the first with a simple 1D Gaussian convolution with a pre-determined size (because the initial match generates an image with a known PSF size which is more-or-less Gaussian). I update the code to enable additional smoothing passes followed by additional radial aperture photometry passes. I have also modified the output files to carry all of these measurements. |
| | 10 | The other implementation problem was a confusion between the stack photometry analysis needed generally and the specific issue of matched-PSF radial photometry. I had originally coded the analysis to perform all stack photometry analyses (detection, PSF generation, source classification, psf and extended model fits, petrosian profiles, etc) on the PSF-matched images. Instead we want only the radial photometry to be performed on the PSF-matched images and all other analyses to be done on the input stack images (optionally the convolved or unconvolved versions). I re-worked the analysis to this end. |
