Dawn data in the PDS |
Dawn data in the PDS |
Feb 15 2012, 12:55 AM
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#1
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
Hey folks, Christmas came just a little bit late this year...
http://dawnpub.igpp.ucla.edu QUOTE DAWN DATA RELEASE: LEVEL 1A DATA FROM APPROACH AND SURVEY It is a LOT of data. Just the Vesta Approach includes about 2000 FC images! Wow!!!The Dawn project has created a public website that is available to serve the cruise and Vesta data sets that have been delivered to the Planetary Data System (PDS) while the data are still under review. Data are available from all three Dawn instruments, the Framing Camera (FC), the Visual and Infrared Mapping Spectrometer (VIR), and the Gamma Ray and Neutron Detector (GRaND). The data that are currently available are raw data, in engineering units, sometimes referred to as EDRs by the PDS or as NASA level-1a data. Additional data sets will be added when they are submitted to the PDS. The Dawn website is located at: http://dawnpub.igpp.ucla.edu Users of these data should exercise caution. Invariably there will be errors or omissions in the documentation. Please report any problems... I think that the first thing I'm going to work on is that approach sequence/movie that I wish I'd had in real time. The rotation of Vesta through the image sequences makes color composition very hard, but I am sure there are people here who are up to it. I hope someone here can come up with a pretty color global shot that I can put into a comparison montage! -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Aug 8 2013, 10:00 PM
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#2
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
I've sent an email to a friend on the Dawn team pointing him to your post -- let's see if I get a response.
-------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Aug 8 2013, 11:58 PM
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#3
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Junior Member Group: Members Posts: 22 Joined: 23-August 11 From: France Member No.: 6134 |
The shape from Gaskell seems to use the old prime meridian with a pole orientation corrected.
So I modified the vesta related SPICE pck file like this: BODY2000004_POLE_RA = ( 309.031 0.0 0.0 ) BODY2000004_POLE_DEC = ( 42.235 0.0 0.0 ) BODY2000004_PM = ( 292.0 1617.332776 0.0 ) Below the result of a projection with a survey picture (FC21A0005503_11232092641F1F): (On Top left: only the shape shading. Top Right: projection+shape shading. Bottom Left: only the projection result) But frankly i didn't measure the actual precision (but certainly not a 30 pixels difference) and didn't try with an HAMO pictures. In waiting for the Dawn Team answer for more informations. |
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Aug 9 2013, 12:32 AM
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#4
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IMG to PNG GOD Group: Moderator Posts: 2254 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
The shape from Gaskell seems to use the old prime meridian with a pole orientation corrected. So I modified the vesta related SPICE pck file like this: BODY2000004_POLE_RA = ( 309.031 0.0 0.0 ) BODY2000004_POLE_DEC = ( 42.235 0.0 0.0 ) BODY2000004_PM = ( 292.0 1617.332776 0.0 ) It works!!! It never occurred to me that the shape model might be in a 'hybrid' coordinate system. 'Hacking' the pck file by applying this modification eliminated most of the discrepancies I was getting, at least for the RC3 images. I'll test the HAMO images tomorrow but I'm pretty sure they'll be fine. More tomorrow and possibly some preliminary image processing results. Big thanks. |
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