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 10 2013, 11:03 PM
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#2
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IMG to PNG GOD Group: Moderator Posts: 2254 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
Everything works now. This is a test image where a HAMO image has been draped over the shape model:
Even though everything works I'm still interested in how accurate the relased camera pointing information should be. Some discrepancies remain but they are much smaller than earlier. For the RC3 images I've tested it's almost perfect though, the error is typically 2-4 pixels. In contrast, there are some differences between HAMO images and rendered shape model images, typically 20-30 pixels. That's probably normal. In the image above I made a relatively crude correction to the pointing - I'll do it more accurately once I start mosaicking images. I'm also interested in the accuracy of the spacecraft position; I'm assuming it to be very accurate. And now something different: Typically only image processing successes get posted here but I'm making a rare exception just to show what can happen when you're doing something new. This was supposed to be a simple cylindrical map of Vesta but there was a simple bug that caused it to have a very strange look: |
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Aug 12 2013, 10:27 AM
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#3
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Junior Member Group: Members Posts: 22 Joined: 23-August 11 From: France Member No.: 6134 |
Everything works now. This is a test image where a HAMO image has been draped over the shape model: Even though everything works I'm still interested in how accurate the relased camera pointing information should be. Some discrepancies remain but they are much smaller than earlier. For the RC3 images I've tested it's almost perfect though, the error is typically 2-4 pixels. In contrast, there are some differences between HAMO images and rendered shape model images, typically 20-30 pixels. That's probably normal. In the image above I made a relatively crude correction to the pointing - I'll do it more accurately once I start mosaicking images. I'm also interested in the accuracy of the spacecraft position; I'm assuming it to be very accurate. Firstly I'm glad that your projections work now and I'm waiting for new pictures of Vesta I suppose that the Dawn Team quickly realized that the pole orientation measure with Hubble data is wrong. And i suppose that the decision of choosing Claudia as Prime merdien came latter when the Gaskell shape was already done. I think that i forgot something important: the rotation rate has been reevaluated too. I just get it when i read your comments. So in order to work with Gaskell shape i think that the parameters in pck file should be: BODY2000004_POLE_RA = ( 309.031 0.0 0.0 ) BODY2000004_POLE_DEC = ( 42.235 0.0 0.0 ) BODY2000004_PM = ( 292.0 1617.3329428 0.0 ) The difference concerned only rotation rate and is very small but maybe important i didn't test it. Concerning the accuracy of position and pointing, I'm not sure but i suppose that the pointing should be very precise since Dawn is able to orientate herself and every telemetry data are stored on board before sent to Earth. The position seems to me more problematic because the DNS sessions are limited. Someone has more info about it ? |
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