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LSSTDESC / BremertonRoundTrip

A hack project for the Bremerton meeting
MIT License
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Compare input and output shape catalogs #9

Open dkirkby opened 8 years ago

dkirkby commented 8 years ago

Since we now have completed the chain from fastcat output to GalSim images to HSM shapes, we are ready to compare these input (from fastcat) and output (from HSM) catalogs.

fjaviersanchez commented 8 years ago

test_fast.txt | uploaded via ZenHub

fjaviersanchez commented 8 years ago

The format is:

object ID RA DEC MAG_NORM sed_name REDSHIFT G1 G2 KAPPA DELTA_RA DELTA_DEC OBJTYPE sersic2D MAJOR MINOR BETA SERSIC

WentaoLuo commented 8 years ago

Got it. Thanks.

WentaoLuo commented 8 years ago

compare_1

WentaoLuo commented 8 years ago

This figure show the difference of two shape measurement pipeline: red: HSM & blue: BJ02. This is only a simple demonstration with exponential galaxy profile and perfect circular PSF.

WentaoLuo commented 8 years ago

compare_2

WentaoLuo commented 8 years ago

In the new plot we apply a PSF with e1=0.03 and e2=0.0.

WentaoLuo commented 8 years ago

compare_3

WentaoLuo commented 8 years ago

When we have PSF wiht e1=0.03 and e2=0.03, then the results from HSM and BJ02 are quite similar. The red dots are actually overlap with blue dots.