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Images and Movies of Venus
cndwrld
post Feb 19 2013, 09:40 AM
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Venus Express created a short 12-second movie showing a 24 hour orbit around Venus. It was featured on the VEX Science and Technology page some time ago, and can be seen at:
http://spaceinvideos.esa.int/Videos/2013/0...f_Venus_Express.


Now you (yes, YOU!) can create your own VEX movies. We've taken several of these 'terminator movies', as we call them. The list of orbits is below, and the data for each one is in the ESA Planetary Science Archive. Anyone can pull out the data and create such movies.

VEX has put together a short instruction manual of how they created the short movie mentioned above. If you'd like to give it a try, go to the FTP site for Venus Express http://www.rssd.esa.int/index.php?project=PSA&page=vex

In the right hand column, under VEX VMC Terminator Movie Cookbook, click on Download to view (and then save) the document. If you have trouble viewing the material, you may wish to read the FAQ file. Users of Chrome browsers, for example, may not be able to access files on the FTP web site due to lack of Chrome support for certain FTP features.

Please use the instructions to go to the Planetary Science Archive and get images for any of the orbits below.

We would love to see some of your images and movies!

Orbits with Terminator Movies
==============================
Listed below are 17 orbits, over three calendar years.

Date Yr-DOY Orbit
======= ==== =====
2010-06-28 10-179 1529
2010-06-29 10-180 1530
2010-06-30 10-181 1531
2010-07-01 10-182 1532
2010-07-02 10-183 1533
2010-07-03 10-184 1534
2010-07-10 10-190 1541
2010-07-11 10-191 1542
2011-02-03 11-034 1749
2011-02-05 11-036 1751
2011-02-06 11-037 1752
2011-02-09 11-040 1755
2011-06-04 11-154 1870
2011-06-05 11-155 1871
2012-01-08 12-008 2088
2012-08-23 12-236 2316
2012-08-24 12-237 2317


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machi
post Feb 19 2013, 12:23 PM
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Nice summary, thank you! It'll be useful! wink.gif


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nprev
post Feb 20 2013, 12:16 AM
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Nice outreach, Cnd, thanks!!! smile.gif


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Bjorn Jonsson
post Feb 20 2013, 12:35 AM
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Thanks, this is really interesting.

And this is a really interesting dataset that deserves far more attention as I already indicated early in this thread (in fact the first post includes a link to an experimental movie on YouTube that I made from VEx VMC images).
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Bjorn Jonsson
post Feb 24 2013, 02:52 AM
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Here is a quick and dirty movie I made from the orbit 1749 images.

In contrast to the ESA orbit 2088 movie I used all 290 images obtained during orbit 1749. This means that the time interval between the images is not uniform but this is actually a good thing since this slows the movie down during closest approach when everything happens very fast.

I still haven't figured out how to flat field these images properly and this is visible in parts of the movie (actually this can also be seen in the ESA movie but not as clearly).
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ElkGroveDan
post Feb 24 2013, 04:02 AM
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Are those all unique images, or do you do some interpolating/morphing?


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Bjorn Jonsson
post Feb 24 2013, 12:47 PM
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All of the images are VEx images - there is no morphing. The main change from the source images is that I translated some of the images horizontally to make the movie more 'smooth'.
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cndwrld
post Feb 25 2013, 02:23 PM
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Very cool, Bjorn. That orbit shows the upper atmosphere obsorber really well. This is great.


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elakdawalla
post Feb 27 2013, 04:21 AM
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Don, I started poking in to this today and am wondering if you can explain to me what the multiple entries in the GEO_VENUS.TAB files mean. There are 25 lines in the table for each image. Some of the metadata is identical (filename, sub solar point, spacecraft altitude, etc) but then there are a whole series of lat/lon, center lat/lon, and phase angle numbers that are different for each of the 25 lines. I assume that this has something to do with quantifying the geometry at specific points in the image but 10 minutes of wandering around the DOCUMENT and INDEX folders didn't result in an explanation for what these things are.

This is, indeed, a large data set, about 150 images per day; I'm trying to figure out a way to come to grips with it. There are browse JPEG thumbnails for every image so it should be possible to make one of my patented browse index pages but first I need to figure out what the salient metadata is. Unfortunately the information on the date that each image was taken is located in a different file from the information on the geometry of each image.


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cndwrld
post Feb 27 2013, 09:48 AM
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QUOTE (elakdawalla @ Feb 27 2013, 05:21 AM) *
Don, I started poking in to this today and am wondering if you can explain to me what the multiple entries in the GEO_VENUS.TAB files mean.


Unfortunately, I can't explain anything about the data format.

The good news is that I know the people who can, in the PSA. The bad news is they are struggling this week to prepare for a meeting; and the meeting is all next week. I'll get your questions to them, and put you in direct contact if needed. And once we get the answers to the questions, we can post them here in case it helps anyone.

But the answer might take a little while, just because of the timing.

In the mean time, I'll run this past another person who might know. Maybe we'll get lucky.





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elakdawalla
post Feb 27 2013, 04:49 PM
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I'm in no hurry, so I'm happy to wait for the answer to this question! Thanks for relaying it.


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Bjorn Jonsson
post Mar 4 2013, 12:29 PM
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I agree that more detailed information on the .TAB files would be very useful but I'm also not in a hurry. I'm interested in making mosaics from some of the images where Venus more than fills the field of view but due to the rapidly varying viewing geometry this requires reprojecting the images to a simple cylindrical map. I could use the SPICE stuff for this but if the .TAB files contain the required information (e.g. subspacecraft point/location of subspacecraft point/north azimuth or right ascension/declination/twist) using them is easier in most cases.
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