First public release of Kaguya data Options

[Phil Stooke]

IMG2PNG can't do it as it is. The problem might be the header, but I'm not sure. A solution along these lines would be great. Any unzip-type app will extract the IMG file from the downloaded file, but I can't get anything else to open the IMG.

Phil

[djellison]

The best analogy I can come up with is the values in HRSC Dems - which a guy on HRSC kindly wrote an IDL routine to churn into something usefull

hrsc2tif
A tool to convert HRSC PDS- or VICAR-format files to TIFF format.
For DTMs, the 16-bit signed integers are converted to 16-bit unsigned integers by adding 32768.
Limitation: only converts files small enough to be read into RAM.
The software requires installation of the free IDL virtual machine, and runs on all common platforms.

This data set is in km if i remember, so it would need to be multiplied by 1000 first - than then have the negative value of the lowest negative altitude added (i.e. if the lowest is -1580 metres, add 1580 to make them all positive values starting at 0)

To be honest, just a raw array of values normally can be convinced to work with ImageJ or Photoshop.

[JohnVV]

i just looked at LALT_GGT_NUM.TAB in ghex edit
see screen shot
[attachment=19510:Screenshot.png]

on the right -- the 3 columns
top one

CODE

89.96875    0.040   0.09375

is looking like excel is going to get puled out
i will need to pull the middle value
first is lat.
second is the gray value
and the third is the long.

[djellison]

As text loaded straight into ImageJ - it's lat long alt - there's a header that describes it once unzipped (I used 7zip) - you may have it muddled somewhere.

[djellison]

Thanks to mhoward's processing and my running it through ImageJ - we have a 16bit Tif for those that like such things. It looks like the attached 1/4 size JPG and is found HERE - About 26 meg

Attached thumbnail(s)

 

[mhoward]

Also, something we've been waiting for for a long time: a proper surface normal map for the Moon.

LALT surface normal map (22MB PNG)

enhanced LALT surface normal map (26MB PNG)

The first version is technically accurate AFAIK; the second is "enhanced" a bit (the normal vector x and y are magnified somewhat). Use whichever one works best. Attached is a quarter-sized version of the enhanced model.

Attached thumbnail(s)

 

[volcanopele]

These Celestia screenshots use mhoward's regular normal map:

[mhoward]

My cellphone probably can't compete with stuff rendered on a full-blown computer, but an experimental version of my Moon Globe app looks better using this data, too.

Attached thumbnail(s)

 

[JohnVV]

for celestia you might want to run the 16bit tiff through nms to make a spherical corrected normal map

[mhoward]

for celestia you might want to run the 16bit tiff through nms to make a spherical corrected normal map

If somebody does that, I'd be curious to know if the result is different from mine. I'm glad to know about those tools, but I don't have time to look into them further now.

[mhoward]

P.S. If anybody prefers raw 16-bit binary integer data over the 16-bit TIFF file, I've got that - just PM me let me know download it from here, while my bandwidth lasts. 5760x2880 16-bit signed integer values, values converted from km to m to retain precision.

[claurel]

If somebody does that, I'd be curious to know if the result is different from mine. I'm glad to know about those tools, but I don't have time to look into them further now.

nms (Normal Map Spherical) just applies a correction for the spherical geometry of a planet. The slope in x is increased by a factor of (1/cos(latitude)) to account for the fact that the map is horizontally compressed near the poles. If you wrote a tool especially to make normal maps for planets, it may already be doing this. If not, it's an easy correction to include.

--Chris

[claurel]

Thanks to mhoward's processing and my running it through ImageJ - we have a 16bit Tif for those that like such things.

Thanks for producing this! What heights to the minimum and maximum pixel values represent in this tiff?

EDIT: Probably a dumb question. After opening the zip, I see that the pixel units are apparently meters.

--Chris

[mhoward]

Thanks, Chris. I've got the sine of the latitude in my math, so I think I'm doing the same thing, maybe in a slightly different way. Still would be curious to know if the result comes out exactly the same.

[volcanopele]

Here are a few more screenshots:




And rotation movie: http://www.youtube.com/watch?v=arMmSCQiuic