| | 1 | |
| | 2 | == Color Color diagrams from SAS 39 data == |
| | 3 | |
| | 4 | Ken suggested that I look at the full force mean psf magnitude measurments by making color color diagrams. I thought it might be useful to compare these to the stack photometry so I did plots from those data as well. |
| | 5 | |
| | 6 | |
| | 7 | == Forced Photometry == |
| | 8 | |
| | 9 | IPP psps forced photometry takes the positions of the detections made in the stack photometry and does forced photometry on the single frame warp images. |
| | 10 | |
| | 11 | I decided to use the "view" !ForcedMeanObjectView which is a join of the tables ObjectThin and ForcedMeanObject. I decided to cut on the qualityFlag requiring that the "good stack" bit be set. In order to keep they query time |
| | 12 | managable I queried a subset of the survey using the projectionID column. This restricted the results to objects in projection cell 1406 (334 < ra < 338 0 < dec < 4) |
| | 13 | |
| | 14 | The query was |
| | 15 | {{{ |
| | 16 | select ForcedMeanObjectView.*, (ForcedMeanObjectView.qualityFlag & 1) as extended |
| | 17 | INTO mydb.[forced_1406] from ForcedMeanObjectView |
| | 18 | where projectionID = 1406 and (ForcedMeanObjectView.qualityFlag) & 16 = 16 |
| | 19 | }}} |
| | 20 | This yielded 562,311 objects. |
| | 21 | |
| | 22 | The ForcedMeanObjectView only has fluxes. Since this was my first set of queries in awhile I decided not to convert the fluxes to magnitudes in the query. I simply grabbed the objects and ran the results through |
| | 23 | various iterations of a [http://www.star.bristol.ac.uk/~mbt/stilts/ STILTS] program to convert to magnitudes.at I used. |
