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  1. Data Management
  2. DM-14084

Enhance display of (Was: Visually display) MOC data in Firefly

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    • Team:
      Science User Interface

      Description

      Implement the visual display of MOC data in Firefly.

      1. Initially, display the HEALPixels actually identified in the MOC (which is just a list of HEALPixel IDs in NUNIQ format) as polygons overlaid on a sky display in Firefly. Include this in the usual Firefly layer control behavior.
        • In this as in other cases, it would be useful to be able to visualize a MOC in the absence of associated image data - i.e., to have the image layer turned off or missing.
        • We would like multiple MOCs to be able to be displayed at once, with selectable colors used.
        • It may be useful to enable the control of both polygon boundary colors, transparency, etc. as well as polygon fill with adjustable transparency.
      2. Later, it would also be useful to:
        1. Make the MOC pixels selectable so that they could be used in query operations to retrieve related data.
          • This is closely related to, but not identical with, the ability to make pixels in a regular HEALPix grid layer selectable.
        2. Enable set-logical operations on combinations of MOCs, allowing the display of set operations such as intersections and unions of MOCs.
        3. Enable the display of MOC data overlaid on x-y plots where the axes are in sky coordinates.

      (This is a separate task from the ability to use MOC data in the back end of a data search engine to allow the search engine to rapidly tell a user whether there is catalog or image coverage available from a given data source / mission / survey for a particular location or region on the sky.)

       

      Note- some but not all of the above has been broken into child task. 

       

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            roby Trey Roby added a comment - - edited

            Xiuqin Wu [X] I aded this ticket to the june sprint, feel free to modify.

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            roby Trey Roby added a comment - - edited Xiuqin Wu [X] I aded this ticket to the june sprint, feel free to modify.
            Hide
            gpdf Gregory Dubois-Felsmann added a comment -

            See the linked document for the IVOA MOC standard.

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            gpdf Gregory Dubois-Felsmann added a comment - See the linked document for the IVOA MOC standard.
            Hide
            gpdf Gregory Dubois-Felsmann added a comment -

            We should consider whether it is useful to allow MOCs to be displayed over regular ("FITS") images, not just HiPS images. This may make things more complicated because the MOC is inherently in HEALPix space - and therefore easier to overlay over a HEALPix-space HiPS image.

            Show
            gpdf Gregory Dubois-Felsmann added a comment - We should consider whether it is useful to allow MOCs to be displayed over regular ("FITS") images, not just HiPS images. This may make things more complicated because the MOC is inherently in HEALPix space - and therefore easier to overlay over a HEALPix-space HiPS image.
            Hide
            gpdf Gregory Dubois-Felsmann added a comment -

            Updated description to show that the first part of this work was (long ago) completed.  MOC display at this level is a current production feature of Firefly.

            Show
            gpdf Gregory Dubois-Felsmann added a comment - Updated description to show that the first part of this work was (long ago) completed.  MOC display at this level is a current production feature of Firefly.

              People

              Assignee:
              gpdf Gregory Dubois-Felsmann
              Reporter:
              gpdf Gregory Dubois-Felsmann
              Watchers:
              Emmanuel Joliet, Gregory Dubois-Felsmann, Trey Roby, Vandana Desai, Xiuqin Wu [X] (Inactive)
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                Updated: