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Bug #279

open

MU_THRESHOLD seems to apply to the analysis threshold, not the detection one.

Added by Emmanuel Bertin almost 8 years ago. Updated almost 8 years ago.

Status:
Resolved
Priority:
Normal
Start date:
02/17/2014
Due date:
02/17/2014 (over 7 years late)
% Done:

0%

Estimated time:
0.50 h
Spent time:

Description

sex -dp says:

#THRESHOLD                Detection threshold above background                      [count]
#MU_THRESHOLD             Detection threshold above background                      [mag * arcsec**(-2)]

although THRESHOLD applies to the detection threshold whereas MU_THRESHOLD applies to the analysis threshold.

Actions #1

Updated by Emmanuel Bertin almost 8 years ago

  • Status changed from New to Resolved

This apparent inconsistency comes from the fact that the analysis threshold also applies to the measurement image, which is the one that sets the astrometric calibration. Hence measurements in mag.arcsec$^{-2}$ can only apply to the measurement image, and therefore only to the analysis threshold here.
Hence it is proposed not to change the code, but to set the definition right:

#MU_THRESHOLD             Analysis threshold above background                      [mag * arcsec**(-2)]

The change has been applied locally and will be committed with the next batch of small fixes.

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