How to make cylindrical maps from NASA imagery? |
How to make cylindrical maps from NASA imagery? |
Apr 16 2011, 10:43 AM
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#1
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Newbie Group: Members Posts: 14 Joined: 6-April 11 From: Cologne, Germany Member No.: 5951 |
Hi(gh)!
I'm a raytracing (POV-Ray!) as well as an astronomy/space flight aficionado since many years and I have always admired those huge cylindrical maps of planets and moons stitched together from images gained by space probes. So I wonder how they are made - how to get exact information about each original image's viewing geometry and illumination phase angle, and what software to use to distort them appropriately to match the cylindrical map projection... can anyone around here give me some clues - or is it somewhat like a "trade secret"? Currently, the "big thing" in making such maps is Mercury, next to Vesta, which will start to be mapped by the DAWN probe within the coming few months... I really would like to be among those who build their own planetary maps for modeling the Solar System! See you in Khyberspace - www.khyberspace.de Yadgar |
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Apr 17 2011, 05:12 AM
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#2
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Member Group: Members Posts: 890 Joined: 18-November 08 Member No.: 4489 |
there are a few different ways
Some NOT free and VERY expensive others are opensource gpl2 or 3 there are about as many ways as people doing it some use MMPS http://www.users.globalnet.co.uk/~arcus/mmps/ it is very handy and the program "img2png " http://www.unmannedspaceflight.com/index.php?showtopic=4979 others use a GIS program like SAGA-gis , or GRASS , --there are many Myself i use ISIS3 from the USGS and NASA ( Linux ONLY !!!!!!) http://isis.astrogeology.usgs.gov/index.html along with Nip2/Vips http://www.vips.ecs.soton.ac.uk/index.php?title=VIPS then add in The Gimp http://www.gimp.org/ also you will find that ( most here ) use Linux for there operating system . some of the programs DO NOT work on Microsoft , other programs do . Now ISIS3 dose take up A LOT and i DO MEAN A LOT of disk space an example for Cassini the isis install is small 762 Meg + 640 Meg of data BUT MRO for mars takes up 44 Gig of data LRO ( what i am using right now ) is 24 Gig of data and Cassini is ~ about 50 Gig ? if i recall right . then there is the map . Just how BIG dose one want ??? a small 8192x4096 pixel ? or a large 665536x32786 px map ( 6Gig 8 bit rgb image ) or like the LOLA data the LDEM_256 7.8 gig( 92160x46080 ) - for one file you need to start by asking what OS are you using ? if Windows vista or 7 then the list is a bit limited if Linux then .... now i think that Bjorn Jonsson and Phil Stooke use img2png and mmps most of the time ? but i might be wrong . and those two DO work on Microsoft . ( though mmps dose need to be built on Mingw) |
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Apr 17 2011, 05:59 AM
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#3
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Founder Group: Chairman Posts: 14431 Joined: 8-February 04 Member No.: 1 |
Myself i use ISIS3 from the USGS and NASA ( Linux ONLY !!!!!!) Slightly semantic, but ISIS3 is also available for OSX. Indeed, that's the only platform I've ever used it on, and if you follow the instructions available on the ISIS3 website, it's actually not too hard to use. It is time, and hard drive, consuming, however. |
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Apr 17 2011, 09:57 AM
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#4
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Newbie Group: Members Posts: 14 Joined: 6-April 11 From: Cologne, Germany Member No.: 5951 |
Hi(gh)!
some use MMPS [...] and the program "img2png " Do they run under Windows XP or under Linux? then add in The Gimp also you will find that ( most here ) use Linux for there operating system . some of the programs DO NOT work on Microsoft , other programs do . On my home system, I run Debian Linux (aptosid, kernel 2.6.38), so this would be no problem... but currently I'm staying with a friend who runs only Windows (XP and Vista), therefore I asked above... then there is the map . Just how BIG dose one want ??? a small 8192x4096 pixel ? 8192 x 4096 would be nice for more distant planet views of my "PoVSolar" project... but when it comes to "aerial" or "pedestrian" views, it really should be 665536x32786 px map ( 6Gig 8 bit rgb image ) or like the LOLA data the LDEM_256 7.8 gig( 92160x46080 ) - for one file (you probably meant "65536 x 32768") And how do I get the information on viewing geometry and illumination phase angle for each raw image? Are they stored within the original IMG format? See you in Khyberspace! Yadgar |
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Apr 18 2011, 08:14 PM
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#5
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Solar System Cartographer Group: Members Posts: 10128 Joined: 5-April 05 From: Canada Member No.: 227 |
You don't need illumination data for this. The orientation is in a label file associated with each image in PDS.
Above all, you can't just press a few buttons and reproject a few images and be finished! Combining them into a good mosaic is an art. You have to be an artist above everything else. Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke 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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Apr 18 2011, 09:51 PM
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#6
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Newbie Group: Members Posts: 14 Joined: 6-April 11 From: Cologne, Germany Member No.: 5951 |
Hi(gh)!
You don't need illumination data for this. The orientation is in a label file associated with each image in PDS. O.k.... then, where can I find such PDS images on the web? Above all, you can't just press a few buttons and reproject a few images and be finished! Combining them into a good mosaic is an art. You have to be an artist above everything else. Yes, I'm pretty much aware that it takes a lot of scrupulous manual work, adjusting color levels and finding matching illuminations (if available)... but I just would give it a try! See you in Khyberspace! Yadgar |
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Apr 18 2011, 09:54 PM
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#7
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Founder Group: Chairman Posts: 14431 Joined: 8-February 04 Member No.: 1 |
You're going to need to do a lot of research yourself - it would take weeks of back-and-forth on a forum to cover what you're going to have to figure out. Fortunately, every single piece of information you're after is already on the web if you care to look for it. To get you started, try these places
Start here : http://pds.nasa.gov/ here : http://isis.astrogeology.usgs.gov/ And some great tutorials from Emily here : http://www.planetary.org/explore/topics/im.../tutorials.html |
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Apr 18 2011, 10:01 PM
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#8
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
And you probably need good (I mean best ) image converter - http://www.unmannedspaceflight.com/index.p...45&start=45
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Apr 20 2011, 02:24 AM
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#9
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Member Group: Members Posts: 890 Joined: 18-November 08 Member No.: 4489 |
while you are on MS windows xp img2png is a good program
also learning to use imagemagick ( on xp i mainly used MinGW-bash - a real terminal ) http://www.imagemagick.org/script/index.php and GDAL http://www.gdal.org/ ( for Debian it should be in the repos ) and Time & research , then some more time . |
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