AstrOmatic forum
SWarp- combining using sigma clipped average - Printable Version

+- AstrOmatic forum (https://www.astromatic.net/forum)
+-- Forum: AstrOmatic software (/forumdisplay.php?fid=3)
+--- Forum: SWarp (/forumdisplay.php?fid=5)
+--- Thread: SWarp- combining using sigma clipped average (/showthread.php?tid=1013)



SWarp- combining using sigma clipped average - Jragonfly - 05-19-2015 00:12

Hello,

I am trying to combine some images using sex, scamp and swarp. I want to combine by sigma clipped averaging.

To test if I got sigma clipping working ok: I tried to use swarp to coadd {20 copies of one exposure and one copy of the same exposure but all pixel values multiplied by 3} together. However, the final coadd.fits image didn't clip out the different exposure as an outlier. I also asked swarp to write out a clipped.log, but that log is empty.

Settings:
CLIP_SIGMA 1.0
FSCALE_KEYWORD SWARPSCL (for all 21 inputs, this keyword value was the same)
CLIP_WRITELOG Y
COMBINE_TYPE CLIPPED

Any help in using the sigma clipping function would be much appreciated! I am using the macports SWarp version 2.38.0 (2014-05-22).