| | 7 | |
| | 8 | * working on integrating ubercal + DVO. I added a flat-correction table to DVO (coded I/O APIs) and added code to convert the ubercal format flat-correction information into the format needed by DVO. I added this information to the 'setphot' program, which also is able to load the ubercal zero points and apply them to the specific measurements. I have updated relphot to refer to the flat-correction, but need to verify that it is working correctly. |
| | 9 | |
| | 10 | * Doug F. and John T. convinced me that there could be a (possibly significant) faint-end bias due to the way I determine the Poisson weighting. I am using the value of the variance as determined from the image (ie, counts + read noise^2^). They make the case that in the low count regime, it is better to use the model as a proxy for the counts, as that is closer to the exact value claimed by a maximum likelihood analysis. We agreed (and, I think, demonstrated in the real data) that the 'constant' weighting scheme is fundamentally equivalent to the model-based variance in the faint limit, but has worse noise properties in the bright limit. I spent some time coding up this 'model-based variance' in psphot. The code is in place and runs more or less correctly, but I need to run a more complete demonstration set to show that it has the desired (or any) effect... |
| | 11 | |
| | 12 | * finalized WISE DVO ingest code and wrote up documentation on the ingest transformations. |
| | 13 | |
| | 14 | * discussions with Chris about the background issues. |
