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Planetary SDI
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Europa SDI 2023-08-24 Working Meeting

Meeting Notes from: May 24, 2023

When 8PM GMT, 12PM PST, 1PM MST https://jpl.webex.com/jpl/j.php?MTID=m3c96c22ed8e335e55dbd40c9084e3763


  • Cynthia
  • Mike
  • Trent
  • Paul
  • Ross
  • Jay


  • Updates on data:
    • Vector data submissions?
      • Europa Geologic map, still not out. What’s going on?
    • Raster data submissions?
      • Raw image Voyager data. Whose court is that in? Jay and Mike will figure that out.
      • Versions with and without reseaus would be preferable. One where reseaus are nulled and not there, one where they are beautified.
  • Paul’s data:
    • Thanks for delivering Paul!
    • What are these data? Paul:
      • Data provided are map projected mosaics of the key observations in the control network. These key observations are part of the global mosaic.
      • The data include observations from 5-7 km/pixel.
      • These were sent to ensure that the control network was not distorted to the existing USGS mosaics.
      • Not sure that these are in the same map projection as the data that USGS is comparing to.
    • Mike:
      • Started to do a comparison. No map2map yet.
      • Has been comparing these to the USGS products that were released.
      • What does it mean to have a horizontal datum? What do we do when there are offsets? Does that tell us anything about the accuracy of the mosaics?
      • Mike show’s the observation mosaics that the USGS made.
      • Comparison of the data:
        • Difference rasters do not work.
        • Paul’s data have been photometrically corrected.
        • Good alignment at the low resolution stuff. Cilix looks good between these.
        • Shifting areas to E15, their are offsets between E15 USGS and E15 from Paul. There is a ~950 m offset. Similar to E11.
        • Other areas (E3) are super locked in.
      • Each data set (USGS and Paul’s) are internally self consistent.
      • Question: Will the USGS high resolution stuff align with a Schenk mosaic?
        • It looks like it is generally at the pixel level. Maybe 2 pixels.
        • Is this the expected accuracy?
          • USGS states that internally, the accuracies are to 0.5 pixels. Are the USGS absolute uncertainties actually higher? By a factor of 2? Or is something else systematic going on?
    • Overall, looking really good. This is really hard.
    • Paul thoughts:
      • These data used the USGS points plus his own points that include JunoCam and New Horizons.
      • USGS:Paul, 5:1 ratio of points.
      • Paul’s points were all hand picked. He found errors in the USGS points.
      • The number of points that Paul removed was trivial. He does not think that that really changed anything. He assumed that this was a weight of numbers approach that swamped the bad points.
      • The JunoCam area is important to see what the effects might be.
      • It might twist the control on the antipodal side.
    • One option: when selecting a horizontal datum would be to re-create the USGS products using Paul’s updated network.
    • Paul can send the high resolution mosaics.
    • Once this datum (Paul’s mosaic as the proxy for the horizontal datum) is okayed, USGS products and DTMs would be recreated.
    • Nominally, this is the path to take after more analysis.
    • Where does it make sense to focus comparisons?
      • In the JunoCam areas.
    • ToDo: Is the 1km offset significant?
    • E4 and Cilix mosaics are uploading now. Others will take a while to upload.
  • Mike Malaska and Ashley Davies are about to release the NIMs data.
    • How does 360 band get served?
    • It’s not a ton of data.
    • Data are hand controlled to what?
      • The old USGS base map (2000).
      • This is so low resolution, does it matter?
    • Mike talked to Mike and offered support (at LPSC).
    • This is a small archive, so it gets an internal PDS review. ANyone interested in doing a science review?
  • Beau vector data?
    • Not sure yet. No time pressure.
  • Rest of the year:
    • Outreach to JUICE (Jay; still todo.)
    • Build engagement materials (punt into September)


Action Items

  • Review the strategy and roadmap documents
  • What do we want to achieve next year?

Next Meeting

September 28th @12PM PST