# Use covariance propagation code to study covariance properties

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## Details

• Type: Story
• Status: Invalid
• Resolution: Done
• Fix Version/s: None
• Component/s: None
• Labels:
None
• Story Points:
10
• Sprint:
DRP S17-1
• Team:
Data Release Production

## Description

This means using the code developed in DM-7129 to study the results achieved on some real data. Likely start by using ci_hsc as a test dataset, and find other data as & when necessary.

End goal is a set scatter plots showing covariance as a function of distance and a parametric fit to that. The easy case is for the "middle" of a coadd, ie with a constant number of inputs: harder, but still necessary, is to see how boundaries where the number of inputs change affect the output.

## Activity

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Jim Bosch added a comment -

I suspect we don't want to start with ci_hsc here - or at least we don't want to start with ci_hsc under its default skymap. I imagine we'll want much smaller than usual patches (and hence more of them) to be able to work with per-pixel covariance without consuming too much memory.

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Jim Bosch added a comment - I suspect we don't want to start with ci_hsc here - or at least we don't want to start with ci_hsc under its default skymap. I imagine we'll want much smaller than usual patches (and hence more of them) to be able to work with per-pixel covariance without consuming too much memory.
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Jim Bosch added a comment -

I also think the output needs to be a bit more than a scatter plot; I think we also want plots that show the spatial behavior of the covariance matrix, especially across discontinuities - something like an image where each pixel is some summary statistic of the row/column of the covariance matrix that corresponds to that pixel in the real image.

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Jim Bosch added a comment - I also think the output needs to be a bit more than a scatter plot; I think we also want plots that show the spatial behavior of the covariance matrix, especially across discontinuities - something like an image where each pixel is some summary statistic of the row/column of the covariance matrix that corresponds to that pixel in the real image.
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John Swinbank added a comment - - edited

Due to Vishal Kasliwal [X]'s likely schedule, we've agreed to put this ticket on hold and focus instead on understanding José's S/G separation code (DM-9001, DM-9002).

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John Swinbank added a comment - - edited Due to Vishal Kasliwal [X] 's likely schedule, we've agreed to put this ticket on hold and focus instead on understanding José's S/G separation code ( DM-9001 , DM-9002 ).
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Superseded by DM-12732

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## People

• Assignee:
Vishal Kasliwal [X] (Inactive)
Reporter:
John Swinbank
Watchers:
Jim Bosch, John Swinbank, Yusra AlSayyad