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  1. Data Management
  2. DM-15431

Add Jacobian BoundedField accessor to SkyWcs

    Details

    • Type: Story
    • Status: Done
    • Resolution: Done
    • Fix Version/s: None
    • Component/s: afw
    • Labels:
      None
    • Templates:
    • Story Points:
      6
    • Sprint:
      AP F18-4, AP F18-5, AP F18-6
    • Team:
      Alert Production

      Description

      We've agreed that it should not be the responsibility of the PhotoCalib to include a Jacobian derived from the WCS, because we don't always want to apply that.  Instead, SkyWcs should have the ability (given a pixel bounding box) to return a BoundedField that evaluates to the determinant of the Jacobian of the pixelToSky transform (aka the pixel area in angular units) at every point in that bounding box efficiently.  This probably involves a new BoundedField class (though it's possible there's a way to do this with TransformBoundedField).

      A reference implementation can be found in meas_mosaic's calculateJacobian functions, though a different approach to vectorization may be necessary to get good performance from AST.

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                • Assignee:
                  Parejkoj John Parejko
                  Reporter:
                  jbosch Jim Bosch
                  Reviewers:
                  Paul Price
                  Watchers:
                  Eli Rykoff, Jim Bosch, John Parejko, John Swinbank, Paul Price, Russell Owen
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                    Updated:
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