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need help. how to uncompress .img files from magellan
post Jan 6 2011, 11:33 PM
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Hoping someone can help.
I am trying to uncompress the FMAP .img files which are part of magellans images of venus so I can use a converter program to convert them from sinusodal to cylindrical mapping.

Things I do know is that I can just rename .img to .raw and open in photosho however the converter program newmap.exe which is an old dos program that is provided with the FMAP images requires I think the uncompressed .img files in order to convert sinusodal to cylindrical. I know the .raw didnt work. And I get error saying my .img files are compressed so it wont work.
I know .img files are not cd or dvd image file or so I think becuase I could not open them in MagicISO If they were CD images I would think MagicISO would work but I may be wrong though.
Anyone familiar with what I am trying to do. Any image processing guys out their do this with the magellan FMAPS?
I figure the experts would be here.
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Phil Stooke
post Jan 6 2011, 11:44 PM
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.img files are not compressed, they are basically tiff-like files with a different header which can be opened in Photoshop as raw images if you know the pixel dimensions (which are given in the label). You probably knew that anyway.

But there are also .imq files which are compressed versions of the .img images. Those have to be treated differently - if you are getting the .img files from the old PDS cd-roms there might be a utility on the disk. I used to deal with those files all the time (and still have probably well over a hundred of the cd-roms collecting dust), but it's been so long I can't remember the details of it now.

It's possible your software just doesn't recognize the PDS .img format and simply thinks it is compressed when it isn't. If the software needs tiffs, for instance, you might have to open in Photoshop and save as a tiff.

We could really use a good clickable map interface to the various levels of Magellan products, too!


... because the Solar System ain't gonna map itself.
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post Jan 7 2011, 12:42 AM
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here is the link

for example grab a sinusodal image called "fl78n018.img" from folder fl78n018 and go into software folder and then pcdos folder and use newmap.exe

example: type this in newmap. (i think i made mistake in my message calling it newone)(this is 1994 program)

newmap fl73n003.img fl73n003new.img -p

("name of input file" "name of output file" "-p specfies cylindercal")

I get error saying my input file has not been decompressed
thats my unknown problem

I am in xp 32bit using dos prompt

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Posts in this topic
- ncc1701d   need help. how to uncompress .img files from magellan   Jan 6 2011, 11:33 PM
- - djellison   URL to the files in question?   Jan 6 2011, 11:39 PM
- - Phil Stooke   .img files are not compressed, they are basically ...   Jan 6 2011, 11:44 PM
|- - ncc1701d   here is the link ftp://pdsimage2.wr.usgs.gov/cdrom...   Jan 7 2011, 12:42 AM
- - elakdawalla   I can't remember if the FMAPs are stored the s...   Jan 7 2011, 12:31 AM
- - siravan   IMG files usually have either a text header or a s...   Jan 7 2011, 12:46 AM
- - ncc1701d   concerning the other post i just noticed. I used ...   Jan 7 2011, 12:49 AM
- - siravan   Here is the first image (reduced to 25% of its ori...   Jan 7 2011, 01:10 AM
|- - ncc1701d   I appreciate all the input here so thank you all. ...   Jan 7 2011, 01:37 AM
- - siravan   I recompiled newmap for XP using the source code c...   Jan 7 2011, 02:34 AM
|- - ncc1701d   for some reason I get my same message *** ERROR *...   Jan 7 2011, 03:00 AM
- - siravan   This is the file I got: I'm not sure about ...   Jan 7 2011, 03:13 AM
|- - ncc1701d   I have to think on this now. Its not what I expect...   Jan 7 2011, 03:24 AM
- - siravan   This is the correct image (I made a mistake in rea...   Jan 7 2011, 03:58 AM
|- - ncc1701d   are you just typing newmap fl73n003.img fl73n003...   Jan 7 2011, 06:36 AM
|- - ncc1701d   thanks siravan I got it to work. My problem was th...   Jan 7 2011, 08:31 AM
- - JohnVV   if you want it is cylindrical you could grab them ...   Jan 7 2011, 07:16 AM
|- - ncc1701d   JohnVV I used to use pdsmaps and it was very helpf...   Jan 7 2011, 08:43 AM
|- - elakdawalla   QUOTE (ncc1701d @ Jan 7 2011, 12:43 AM) m...   Jan 7 2011, 05:03 PM
|- - ncc1701d   ok here is little more clarification about what bu...   Jan 7 2011, 08:54 PM
- - JohnVV   some of it still works http://www.mapaplanet.org/e...   Jan 7 2011, 10:27 AM
- - Phil Stooke   I agree, I use Map-a-Planet all the time and reall...   Jan 7 2011, 08:44 PM
- - elakdawalla   OK, I see your problem. The "Center of Proje...   Jan 7 2011, 09:08 PM
|- - ncc1701d   Thank you. I found it. Just out of curiosity did y...   Jan 7 2011, 11:54 PM
- - JohnVV   early on i liked pds-map-a-planet for the simple ...   Jan 8 2011, 12:27 AM

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