# Warp processing failure around field edges

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## Details

• Type: Story
• Status: Won't Fix
• Resolution: Done
• Fix Version/s: None
• Component/s:
• Labels:
• Team:
External

## Description

We encountered a few processing failures in the HSC S19A production around the edges of the field:

 RuntimeError: AST: Error at line 53 in file src/FitsChan.cc.astFindFits(FitsChan): Cannot encode floating point value nan into a FITS header card for keyword 'BGMEAN'. 

The problem occurs in deblendCoaddSources, and brings multibandDriver down.

The coadd image (tract=9812 patch=5,3 filter=NB0921) is completely NAN. In this case, the only contribution to the image is visit=67792 ccd=103.

Make this fail nicely.

## Activity

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Paul Price added a comment -

I've been unable to reproduce this failure, even when I substitute the bad coadd from S19A. I've checked that we're still putting BGMEAN = NaN, but I believe DM-21355 fixed reading/writing NANs in the header.

Show
Paul Price added a comment - I've been unable to reproduce this failure, even when I substitute the bad coadd from S19A. I've checked that we're still putting BGMEAN = NaN , but I believe DM-21355 fixed reading/writing NANs in the header.
Hide
Tim Jenness added a comment -

Yes. We did fix that a while ago. I thought I recognized it.

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Tim Jenness added a comment - Yes. We did fix that a while ago. I thought I recognized it.

## People

• Assignee:
Paul Price
Reporter:
Paul Price
Watchers:
Paul Price, Tim Jenness