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Mariner 6 and 7 Mosaics
mcaplinger
post Sep 4 2013, 03:33 AM
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QUOTE (tedstryk @ Aug 4 2008, 01:56 PM) *
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.


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tedstryk
post Sep 4 2013, 09:42 AM
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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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mcaplinger
post Sep 4 2013, 04:11 PM
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QUOTE (tedstryk @ Sep 4 2013, 02:42 AM) *
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


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Brian Swift
post Aug 26 2022, 11:50 PM
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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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Phil Stooke
post Sep 9 2022, 10:55 PM
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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

Attached Image


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Antdoghalo
post Sep 11 2022, 03:42 AM
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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.


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Phil Stooke
post Sep 11 2022, 07:10 AM
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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



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Antdoghalo
post Oct 22 2022, 01:53 PM
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Do you plan to make a combination of Mariner 4, 6 and 7 in the future with near and far?


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Phil Stooke
post Oct 23 2022, 07:08 AM
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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



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Antdoghalo
post Jan 8 2023, 03:38 PM
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QUOTE (Phil Stooke @ Sep 11 2022, 02:10 AM) *
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.


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Phil Stooke
post Jan 9 2023, 05:28 PM
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I will find those flies.

Phil



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Antdoghalo
post Jan 31 2023, 10:51 PM
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Did you ever find the gridless near and far encounter maps?


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Phil Stooke
post Feb 3 2023, 06:19 PM
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Yes. Here they are. Mariners 4, 6 and 7 combined. The projection is Azimuthal Equidistant.

Phil

Attached Image


Attached Image


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vikingmars
post Feb 4 2023, 06:55 AM
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QUOTE (Phil Stooke @ Feb 3 2023, 07:19 PM) *
Yes. Here they are. Mariners 4, 6 and 7 combined. The projection is Azimuthal Equidistant. Phil

What a nice work! Thank you very much Phil smile.gif
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Antdoghalo
post Feb 9 2023, 02:48 PM
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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.
Attached thumbnail(s)
Attached Image
 


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