Mariner 6 and 7 Mosaics |
Mariner 6 and 7 Mosaics |
Sep 4 2013, 03:33 AM
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#16
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Senior Member Group: Members Posts: 2542 Joined: 13-September 05 Member No.: 497 |
The digital images were in 7-bit form and only a fraction of the pixels were transmitted... Sorry to resurrect this thread, but it was linked in Emily's blog posting on Bruce Murray and early Mariner images, see http://www.planetary.org/blogs/emily-lakda...ner-images.html The statement about only a fraction of the pixels being transmitted is not completely accurate: see http://mars.jpl.nasa.gov/mgs/msss/camera/i..._2_00_vishniac/ and http://mars.jpl.nasa.gov/mgs/msss/camera/i...m7_imaging.html for a description of how the MM69 camera system worked. All of the pixels were transmitted, but some only in analog AC form. As for "Murray's stubborn insistence that it would be ludicrous to send a spacecraft to Mars and not include a camera", NASA is of course just about to do that with MAVEN. The PI even speaks with pride (see http://www.aviationweek.com/Article.aspx?i...759.xml&p=2 ) about his resistance to "science creep", even though AFAIK the mission cost a fairly large fraction of the total cost of MRO -- $671M for MAVEN, $720M for MRO. Disclaimer: being a camera designer I obviously have some bias. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Sep 4 2013, 09:42 AM
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#17
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Interplanetary Dumpster Diver Group: Admin Posts: 4404 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
For the color approach sequence, there was no analog transmission. Just the limited digital data. The tape recorder was being saved for near encounter.
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Sep 4 2013, 04:11 PM
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#18
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Senior Member Group: Members Posts: 2542 Joined: 13-September 05 Member No.: 497 |
For the color approach sequence, there was no analog transmission... The tape recorder was being saved for near encounter. You're right for this sequence (obviously you've worked with this dataset more than I have), but as you note on your web site, some of the far-encounter images were transmitted in full-res analog. See http://archive.org/stream/nasa_techdoc_197...e/n294/mode/1up -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Aug 26 2022, 11:50 PM
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#19
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Member Group: Members Posts: 427 Joined: 18-September 17 Member No.: 8250 |
While looking into Mariner 6/7 image processing today, came across a
2020 PDART (Planetary Data Archiving, Restoration, and Tools) project to restore and archive in PDS Mariner 6/7 images and SPICE kernels. PDS Archive Directory: https://pds-geosciences.wustl.edu/mariner/m...rt14_mariner69/ PDF description of PDART work: https://pds-geosciences.wustl.edu/mariner/m...le_overview.pdf |
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Sep 9 2022, 10:55 PM
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#20
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Solar System Cartographer Group: Members Posts: 10229 Joined: 5-April 05 From: Canada Member No.: 227 |
This is a good opportunity to post this - the sum of all imaging by Mariners 4, 6 and 7. The background map is a mosaic of far encounter images from 6 and 7, and the superimposed Mariner 4 and the 6 and 7 near encounter images show everything that was known about the planet's surface until Mariner 9 arrived in 1971. The white patch in the north was not visible to the 6 and 7 missions. I am not counting the Mars 3 orbiter images which are not really very useful.
Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PDF: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Sep 11 2022, 03:42 AM
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#21
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Member Group: Members Posts: 242 Joined: 13-October 09 From: Olympus Mons Member No.: 4972 |
This is neat! Do you by chance have a cylindrical version without grid lines and labels? Would like to use it in the program Celestia as part of a series of Mars textures showing how the Red Planet has changed over the decades.
-------------------- "Thats no moon... IT'S A TRAP!"
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Sep 11 2022, 07:10 AM
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#22
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Solar System Cartographer Group: Members Posts: 10229 Joined: 5-April 05 From: Canada Member No.: 227 |
I don't have a version with the near encounter images in cylindrical projection but I do have the background maps for both Mariner 6 and 7. I will dig them out.
Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PDF: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Oct 22 2022, 01:53 PM
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#23
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Member Group: Members Posts: 242 Joined: 13-October 09 From: Olympus Mons Member No.: 4972 |
Do you plan to make a combination of Mariner 4, 6 and 7 in the future with near and far?
-------------------- "Thats no moon... IT'S A TRAP!"
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Oct 23 2022, 07:08 AM
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#24
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Solar System Cartographer Group: Members Posts: 10229 Joined: 5-April 05 From: Canada Member No.: 227 |
The composite was made in the azimuthal projections. I don't have time to project to cylindrical. Only the far-encounter bases were done in cylindrical projection. I will dig them out when i can.
Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PDF: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Jan 8 2023, 03:38 PM
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#25
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Member Group: Members Posts: 242 Joined: 13-October 09 From: Olympus Mons Member No.: 4972 |
I don't have a version with the near encounter images in cylindrical projection but I do have the background maps for both Mariner 6 and 7. I will dig them out. Phil I am interested, could you post a full resolution version without the grids or labels of the near and far encounter stuff of 4 6 and 7? I would like to see if I can reproject them to equirectangular and use them for an addon for Celestia showing the changes of Mars overtime starting with the late 60's. -------------------- "Thats no moon... IT'S A TRAP!"
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Jan 9 2023, 05:28 PM
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#26
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Solar System Cartographer Group: Members Posts: 10229 Joined: 5-April 05 From: Canada Member No.: 227 |
I will find those flies.
Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PDF: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Jan 31 2023, 10:51 PM
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#27
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Member Group: Members Posts: 242 Joined: 13-October 09 From: Olympus Mons Member No.: 4972 |
Did you ever find the gridless near and far encounter maps?
-------------------- "Thats no moon... IT'S A TRAP!"
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Feb 3 2023, 06:19 PM
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#28
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Solar System Cartographer Group: Members Posts: 10229 Joined: 5-April 05 From: Canada Member No.: 227 |
-------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PDF: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Feb 4 2023, 06:55 AM
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#29
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Senior Member Group: Members Posts: 1089 Joined: 19-February 05 From: Close to Meudon Observatory in France Member No.: 172 |
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Feb 9 2023, 02:48 PM
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#30
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Member Group: Members Posts: 242 Joined: 13-October 09 From: Olympus Mons Member No.: 4972 |
I managed to reproject these and with slight touchups, incorporate them into the far encounter imagery with an Earth-based map covering the north polar region. I then adjusted the contrast of the near encounter images to produce this map showing our knowledge of Mars at the end of the 60's. Because of the major dust storm in 71, the albedo features of Mars changed permanently.
-------------------- "Thats no moon... IT'S A TRAP!"
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