Dawn data in the PDS Options

[JohnVV]

from another post of mine on a different forum
but the above data from

http://dawndata.igpp.ucla.edu/tw.jsp?secti...Ms/DLR_HAMO_DTM



small lores mesh with a 4k normalmap and 4k texture


for some views of a 8ppd mesh from the 48 ppd DEM
http://forum.celestialmatters.org/viewtopi...;p=12522#p12512

[Bjorn Jonsson]

Time flies. It's as if Dawn was at Vesta yesterday and yet there are only about two months until Ceres arrival. Here are two images showing Vesta's Numisa crater:



The left one is a true color RGB mosaic from HAMO images. The right one includes a single clear filter LAMO frame that has been colorized from the HAMO data. It shows a bigger amount of interesting small scale details, e.g. the small dark-rayed craters.

And finally a false color mosaic from LAMO images obtained with the 918, 749 and 548 nm filters. The image has been processed to greatly exaggerate any color variations to better reveal compositional variations:



The big gaps are there because during the LAMO mission phase, Dawn didn't image Dawn globally in color. Also during LAMO, only images obtained with the clear filter are full resolution images. Images obtained with color/NIR filters are 2x2 binned so the resolution here isn't as high as in the RGB colorized clear filter image at top right.

The HAMO images were obtained on 2011-10-27 and 2011-10-31.

The single clear filter LAMO image was obtained on 2012-03-30.

The LAMO images used to make the false color mosaic were obtained on 2012-02-07 and 2012-02-19

[elakdawalla]

Fantastic work, Bjorn.

FYI to all, the original plan (or at least the mission requirement) for Dawn at Vesta was for there to be *no* imaging during LAMO -- the fact we have anything, discontinuous though it might be, is terrific. Here are some relevant notes from an interview I did with Marc Rayman in preparation for a Sky & Tel article on Dawn at Ceres that's going to press soon.

Marc: Our original plan for Vesta LAMO was to not take pictures. Ultimately we did, and got an entire surface map, but our plan for Ceres is to take images. It's not a priority -- we don't have a requirement -- this is a way of illustrating that the most important objectives of LAMO are neither in imaging or visible and infrared spectrometry. It's gamma ray spectrometry, the neutron spectrometry, and gravity, and that's what drives us to LAMO.

[Superstring]

Forgive me if this was inferred in your post, but do you or anyone else know if we'll get true (or approximately true) color images of Ceres? I read somewhere that that was not planned.

[elakdawalla]

Yes, there will be color images, for sure. At least there will be color-filter images taken. But we didn't get much in the way of processed color images out of the Dawn mission officially; we had to wait for Bjorn and Daniel etc. to get a hold of the data in the PDS. I hope rather than expect things to be different at Ceres.

[JohnVV]

from the "HAMO_truecolor_DLR" folder
http://dawndata.igpp.ucla.edu/tw.jsp?secti...O_truecolor_DLR

a reduced size 8 ppd copy of the 48 ppd mosaic


now if you want the REALLY HUGE map
there are 3 -- 11.96 Gig maps here
-- 20 Meters per pixel --
http://dawndata.igpp.ucla.edu/tw.jsp?secti.../LAMO_color_DLR

[JohnVV]

might be a down server ,but as of just now ( i noticed it ) the dawn links are dead

http://dawndata.igpp.ucla.edu

replaced with a login screen

[volcanopele]

Ceres FC and VIR data from Approach and the RC3 orbit are now in the PDS:

http://sbn.psi.edu/pds/resource/dwncfc2.html
http://sbn.psi.edu/pds/resource/dwncvir.html

If you want to turn some of this data into maps, don't forget to download the latest PCK file for Ceres: http://naif.jpl.nasa.gov/pub/naif/DAWN/ker...n_ceres_v05.tpc

[ZLD]

Over 2GB for Approach and RC3, really? Wasn't going to guess that. Thanks for the update. Was expecting it about now.

Edit: Wow, they actually meant 19GB uncompressed, rather than Gb.

[ZLD]

Someone care to explain why the bright spots in Occator are showing up so clearly here on a completely dark disc of Ceres?



Original File

I'm at a complete loss...

Edit: Probably a short exposure front lit image. Strange all the same.

[JohnVV]

For the image
FC21A0036793_15125202815F5D.cub ( dawnfc2isis )
this is not a 8 bit 1 to 255 tone image

it's values are 269 to 2184 it is a 16 bit LSB unsigned integer
to quote PART of the image header ( attached )

OBJECT = IMAGE
INTERCHANGE_FORMAT = BINARY
LINE_SAMPLES = 1024
LINES = 1024
BANDS = 1
SAMPLE_BITS = 16
SAMPLE_TYPE = "LSB_UNSIGNED_INTEGER"
FIRST_LINE = 17
FIRST_LINE_SAMPLE = 35
UNIT = "DU"
INST_CMPRS_NAME =
"SET PARTITIONING IN HIERARCHICAL TREES (SPIHT TAP)"
INST_CMPRS_RATIO = 4.14
INST_CMPRS_TYPE = "LOSSY"
PIXEL_AVERAGING_WIDTH = 1
PIXEL_AVERAGING_HEIGHT = 1
END_OBJECT = IMAGE

screenshot in Qview

[ZLD]

Aw, so it is. I was trying to quickly convert some .IMG files wing img2png and that was turning out some strange results. The FITs work correctly in NASA view though.

[JohnVV]

The FITs work correctly in NASA view though.

as i recall nasaview outputs a 8 bit indexed gif ( the 1990's are calling )

Nip2 ( GPL ) opens fits just fine AS a 16 bit image
Gmic (GPL )opens fits images just fine ( converts it to 32 bit by default )
gimp 2.9.1 DEVELOPMENT (GPL ) opens a 16 bit fits image just fine ( as a 16 bit image )

[elakdawalla]

I made a set of index pages to the Dawn data releases to help you all (and me) get a handle on the data. Somebody please make me some pretty color global images

[ZLD]

Thanks Emily. Definitely a big help.