Dawn data in the PDS |
Dawn data in the PDS |
Feb 15 2012, 12:55 AM
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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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Jul 22 2014, 04:30 PM
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IMG to PNG GOD Group: Moderator Posts: 2254 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
Here are two images showing Aricia Tholus:
North is up. The first one is an approximately true color mosaic from HAMO data. The second one shows more details and includes LAMO images colorized from the HAMO images. The HAMO images were obtained by Dawn on October 26, 2011 and the LAMO images on April 30, 2012. Dawn imaged Vesta globally using all of its color filters during the HAMO mission phase. A lot of clear filter coverage was also acquired during LAMO but color coverage is limited. Only the 918, 749 and 548 nm filters were used for color during LAMO, the images are 2x2 binned and only cover selected parts of Vesta's surface. So if you want RGB LAMO images you must use HAMO images to colorize the LAMO clear filter images. As in the images I have posted earlier in this thread, the above mosaics were made by using the shape model to reproject the images to simple cylindrical projection. All of the mosaicking and color work was then done in simple cylindrical projection and the final image products then made by rendering the shape model with the map draped over it. The shape model is big and accurate enough that this works very well for HAMO and LAMO data. I sometimes needed to translate the reprojected data by 1-2 pixels in the x and/or y direction though when doing color composites and/or mosaics. Aricia Tholus is really a mountain but this is not obvious in the images above where we are looking directly down. But an anaglyph made by draping the above HAMO image on the hi-res shape model shows this beautifully; here we are looking to the west: This also makes it obvious that even though some of Aricia Tholus is dark, parts of it are made darker by being tilted away from the sun. I should mention that I converted the shape model to a png file using the following img2png command: img2png global.pds -fstretch211946,293010 This results in a png file where black represents points that are 211.946 km from Vesta's center and white is 263.010 km from Vesta's center. This is the full elevation range of the shape model. The most recent version of img2png must be used for this to work properly. Of course it is also possible to use false color HAMO data to colorize the higher resolution LAMO data. Here is an example showing Aelia, a small crater with interesting streamer-like crater rays: Here 918, 749 and 548 nm HAMO images are used for red, green and blue respectively. Color saturation has been greatly exaggerated, I set the saturation to 85 in Photoshop after first making the average color of the image gray. The HAMO images were obtained by Dawn on October 4, 2011 and the two LAMO images on January 10, 2012 and April 30, 2012. |
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