[X] My Assistant

[jmknapp]

What is the highest resolution Mars map available, preferably color?

[Phil Stooke]

More info needed! MOLA topography? Approximately true surface color and albedo? Both combined? Did you want digital, or a published paper map? Does the projection matter?

Phil

[jmknapp]

More info needed! MOLA topography? Approximately true surface color and albedo? Both combined? Did you want digital, or a published paper map? Does the projection matter?

Phil

Something along the lines of the MGS/MOC or the Mars Express visual camera. Digital, cylindrical projection.

MSSS has a very hi-res map in black and white. The MSSS web site says they are working on a color version, and some kind of combined MOC/MOLA, but I think that hasn't happened--at least I couldn't find them there.

[Phil Stooke]

Try this:

ftp://ftpflag.wr.usgs.gov/dist/pigpen/mar...dim21/jpeg2000/

more info here:

ftp://ftpflag.wr.usgs.gov/dist/pigpen/mars/


from the USGS planetary GIS site. They do say "Please browse our Mars GIS FTP site for files that have not yet been linked." so you can poke around in here.

But no color yet.

Phil

[mcaplinger]

MSSS has a very hi-res map in black and white. The MSSS web site says they are working on a color version, and some kind of combined MOC/MOLA, but I think that hasn't happened--at least I couldn't find them there.

That's true, we haven't completed that. Our MRO, MSL and LRO work has cut into the hobby time I used to make the B&W mosaics, and the color mosaics are much more labor-intensive to make.

http://www.arcscience.com/face.htm has a colorized Mars map, but it appears to be a commercial product.

[jmknapp]

That's true, we haven't completed that. Our MRO, MSL and LRO work has cut into the hobby time I used to make the B&W mosaics, and the color mosaics are much more labor-intensive to make.

The sheer amount of data is amazing. Your 256 pixels/degree map is multiple gigabytes, but even then is only a fraction of the MOC resolution. I'm looking for a map from which to generate simulated HiRISE views, but 256 pixels/degree at the equator works out to 232 meters/pixel, compared to the HiRISE resolution of 0.30 meters/pixel. For the 1.14 degree FOV, the 256 ppd map at 300 km altitude affords about 26 pixels across, compared to 20,000 for HiRISE. Of course, I shudder to think of how many bytes a full MOC resolution map would entail, and the amount of work involved making it.

Phil: Thank for the links. I'll have to read up on that JPEG2000 format. I tried a couple of programs that are supposed to read that format but they both bombed out with a Windows unrecoverable application error when trying to read the images (over 200 MB JPEG2000). Maybe I need more than 512MB RAM!

[djellison]

There used to be a 20k wide map at maps.jpl.nasa.gov - but it seems to have vanished.


mc's great map is, iirc, MOCWA - and thus never going to be much more than 250m/pixel - and there's very little coverage, globally, with MOCNA, which would be down at the 1.5->5m/pixel range - so a map couldnt be done at that res.

I wonder what could be done with Themis imagery

Any idea if CTX and MARCI imagery is going online in the same fashion as HiRise?

Doug

[Bjorn Jonsson]

What would be particularly interesting (at least for me) is a map without shadows (really an albedo/color map). This is useful for use in 3D rendering in conjunction with the MOLA data.

In theory, this map could probably be made from existing colormaps by setting the luminosity (in hue-saturation-luminosity) to a constant value for the entire map. A big problem with this is that some of the shadows are very dark or black so there is no useful color information in the shadows.

[jmknapp]

That's true, we haven't completed that. Our MRO, MSL and LRO work has cut into the hobby time I used to make the B&W mosaics, and the color mosaics are much more labor-intensive to make.

I'm curious as to why the gap in the data between 60-65S? something to do with the geometry of the MGS orbit?

[mcaplinger]

I'm curious as to why the gap in the data between 60-65S? something to do with the geometry of the MGS orbit?

The basemap used for the mosaic (a hand mosaic of global map swaths) wasn't useful south of 60S. While the actual Geodesy Campaign data goes down to 65S (it was taken during southern winter so areas south of there were in darkness), the basemap control rendered the area between 60S and 65S too dark to use. And the south polar coverage we took later started at 65S.

This could all be reprocessed and fixed, and it's on my list of things to do, but not very close to the top.
The gap was fixed for the "Mars Atlas" but that was only produced at 64 pix/deg -- see http://www.msss.com/mars_images/moc/moc_atlas/

[vikingmars]

Here is your link for Mars maps to download :
http://www.celestiamotherlode.net/catalog/mars.php
Enjoy !

What is the highest resolution Mars map available, preferably color?

[jmknapp]

Here is your link for Mars maps to download :
http://www.celestiamotherlode.net/catalog/mars.php
Enjoy !

Thanks... very nice maps there up to 16k (45 pixels/degree). I'm going to try to make an MRO sim that uses those maps further out & then mcaplinger's maps (up to 256 pixels/degree) closer in. Here's an animation of the approach & first two orbits using praesepe's maps from the Celestia link:

MRO approach animation (10MB MPG file)

Still working on crunching mcaplinger's 256 pixels/deg map tiles into small tiles--they are a bear, up to 600MB each and 4 gigs total.

[Bob Shaw]

Thanks... very nice maps there up to 16k (45 pixels/degree). I'm going to try to make an MRO sim that uses those maps further out & then mcaplinger's maps (up to 256 pixels/degree) closer in. Here's an animation of the approach & first two orbits using praesepe's maps from the Celestia link:

MRO approach animation (10MB MPG file)

Still working on crunching mcaplinger's 256 pixels/deg map tiles into small tiles--they are a bear, up to 600MB each and 4 gigs total.

For a horrible moment at the end of the sequence I thought there was a SPLAT!

I was s-o-o-o-o-o wrong!

Bob Shaw

[jmknapp]

The THEMIS IR images from Odyssey seem very detailed. Have they been compiled into a global map?

[Phil Stooke]

Not yet but will be.

http://astrogeology.usgs.gov/Projects/THEMISMosaics/

Phil