GNU Astronomy Utilities - Bugs: bug #55217, --align not working as expected in...
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bug #55217: --align not working as expected in left-hand oriented WCS
Submitter: | Mohammad Akhlaghi <makhlaghi> | ||
Submitted: | Thu 13 Dec 2018 01:52:58 AM UTC | ||
Category: | Warp | Severity: | 3 - Normal |
Item Group: | Output not reasonable | Status: | Postponed |
Privacy: | Public | Assigned to: | None |
Open/Closed: | Open |
Thu 28 May 2020 04:09:57 AM UTC, comment #1: |
Mohammad Akhlaghi <makhlaghi> |
Thu 13 Dec 2018 01:52:58 AM UTC, original submission:
When the input WCS dataset is left-hand oriented (East is to the left of North, what ever direction North has), then the `--align' operator doesn't work as expected.
|
Mohammad Akhlaghi <makhlaghi> |
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Corresponding source code
Currently, this can be fixed by flipping the image along the problematic axis ('--flip=1,0' or '--flip=0,1'). In Commit 6dc1fd447fd a warning has been added to explain the problem.
But unfortunately '--flip' has to be called in a separate/prior call to Warp, it can't be in the same call, because we only implement the warping matrix in the WCS at the end of all rotations. So one useful step in this bug may be to apply the WCS correction after each separate warp.