taskGNU Astronomy Utilities - Tasks: task #14147, Use WCS coordinates in Arithmetic


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task #14147: Use WCS coordinates in Arithmetic

Submitter:  Mohammad Akhlaghi <makhlaghi>
Submitted:  Mon 05 Sep 2016 04:49:23 PM UTC
Should Start On:  Mon 05 Sep 2016 03:00:00 PM UTC Should be Finished on:  Mon 05 Sep 2016 03:00:00 PM UTC
Category:  Arithmetic Priority:  5 - Normal
Item Group:  Enhancement Status:  Postponed
Privacy:  Public Percent Complete:  0%
Assigned to:  None Open/Closed:  Open
Effort:  0.00

Mon 05 Sep 2016 04:51:17 PM UTC, comment #1: 

Sorry, at the end of the first paragraph I meant to say "... are accurate, Arithmetic will not work ...", I mistakenly wrote ImageCrop!

Mohammad Akhlaghi <makhlaghi>
Project Administrator
Mon 05 Sep 2016 04:49:23 PM UTC, original submission:  

After several warpings and croppings (which are necessary during data processing) the sizes of each output might be slightly different (by a pixel for example). So while the WCS coordinates (which are floating points) are accurate, ImageCrop will not work and will complain about the size of the images.

So Upon reading each image operand, Arithmetic should have an operating mode where it will warp the newly read input into the grid of the image in memory (based on the WCS information, or a given WCS information). This way it can do its operations accurately, irrespective of what size the actual images are. This can also be used in creating deep images later.

In the core, a job like this should actually be done by ImageWarp too: so instead of a warping Matrix, you can give ImageWarp a reference FITS image and it will warp the input image to the WCS coordinates of the input image. So we should be working on a library function for this job for all utilities to benefit from.

Mohammad Akhlaghi <makhlaghi>
Project Administrator


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