March 15, 2010 PDS release Options

[Phil Stooke]

PDS has now implemented the Planetary Image Atlas search for LRO data, especially images. Go to the geometry tab, enter min and max lat and long (negative lat for south, longitudes measured to the east), and it will find LROC images for you. Best for browsing purposes, you can display and save a jpeg browse image.

http://pds-imaging.jpl.nasa.gov/search/sea...tml#QuickSearch

Phil

[zeBeamer]

They have:
45 degrees north and south at (I believe) 100 meters/pixel, 200m/px, 400m/px in the same formats.
60 degrees north and south at 120m/px, 240m/px
75 degrees north and south at 30m/px, 60m/px, 120m/px
80 degrees north and south at 20m/px, 40m/px, 80m/px
85 degrees north and south at 10m/px, 20m/px, 40m/px
87.5 degrees north and south at 5m/px, 10m/px, 20m/px

Correct. Polar maps are in stereographic projection (true scale at the pole, R=1737.4km).

They offer the whole moon unwrapped as a cylindrical map at 4, 16, and 64 pixels per degree, in JPEG2000, .IMG, .GRD formats. Personally, I have no idea how to use the .GRD, so I'm sticking to the JPEG2000 and .IMG files.

The GRD are netcdf-binaries, created with the GMT package (gmt.soest.hawaii.edu). They are double-precision, unlike the IMG and JP2 which are downconverted to 16bit. GMT can convert those to binary 3-column (with grd2xyz), but any netcdf-reader will do.

I'm going to assume that with more orbits and more laser points recorded, the density of detail will just keep going up, as will the file size.
I need a new computer.

With more orbits, the gaps between tracks will be reduced (density of detail), but the file sizes should not change.
If your computer can handle those, it will be fine with the future releases


Erwan

[Rick Sternbach]

Erwan,

I haven't a clue what netcdf-binaries are, so I'll stick to the .img and JP2 files. However, I have a question about the files other than the complete cylindrical maps. I downloaded one of the 45S JP2 files, and all I see is a single 7200x7200 pixel image. Is there more of 45S somewhere, or can I not see the rest of that latitude because Photoshop isn't made to do that? Or has the rest of that latitude not been released yet?

EDIT: Okay, I see what's going on; the north and south files are closer and more detailed views centered on the poles, so this isn't like the MOLA files going around in longitude for each latitude increment. This means I'm going to have to wait for 128 or 256 or higher pixels/degree for a feature like Copernicus. Hmmm.

Rick

[zeBeamer]

I haven't a clue what netcdf-binaries are, so I'll stick to the .img and JP2 files. However, I have a question about the files other than the complete cylindrical maps. I downloaded one of the 45S JP2 files, and all I see is a single 7200x7200 pixel image. Is there more of 45S somewhere, or can I not see the rest of that latitude because Photoshop isn't made to do that? Or has the rest of that latitude not been released yet?

netcdf : http://www.unidata.ucar.edu/software/netcdf/ ; libraries allow such files to be used in various programs/platforms

this is a stereographic projection, so the sphere was projected onto a plane. This particular grid you mention extends to +/- 1440km in both directions. The projection of a point at 45degS from the south pole is ~1440km away from the pole, hence the name. Such points are at the center of each side. However, when you are at a corner of the grid, at a distance of 1440*sqrt(2)~2037km, you are actually at 29.25degS. The 45deg latitude circle would be a circle that is nearly tangent to the top-center, right-center, bottom-center and left-center point.
(it's like http://www.colorado.edu/geography/gcraft/n.../mapproj_f.html, but we're putting out a square grid instead of a disc).

Erwan

[Rick Sternbach]

Erwan,

Okay, I get it now, as I attempted to convey in my edited comment. I'll still assume we have to wait for much higher-rez data on Copernicus. - Rick

[mhoward]

This is a great data release. The work that's been done to make the LOLA data accessible is much appreciated. What's even more exciting is that the data set should keep getting better. It's already better than I was expecting for this first release.

Below is a view from a possible future version of Moon Globe, after just a couple hours monkeying around.

I have one technical question for Erwan: Is the data in LDEM_64.IMG signed? From the header file LDEM_64.LBL.txt I would expect it to be a signed integer offset from 1,737,400m with a scaling factor of 0.5; however, the data appears to be unsigned integer, not signed. It makes me wonder about the noted offset and scaling factor.

Thanks!

Attached thumbnail(s)

 

[Stu]

In the news, Phil, congratulations!

http://www.canada.com/technology/Canadian+...0499/story.html

[Maquis]

Wow, excellent!
On which RAW was it sitting in?

[zeBeamer]

I have one technical question for Erwan: Is the data in LDEM_64.IMG signed? From the header file LDEM_64.LBL.txt I would expect it to be a signed integer offset from 1,737,400m with a scaling factor of 0.5; however, the data appears to be unsigned integer, not signed. It makes me wonder about the noted offset and scaling factor.

actually, thanks for finding that out (and reading the doc first ). The cylindrical IMGs had a problem. They should now be fine (signed int16), so please redownload... Alternatively, you could download the smaller JP2 and decompress it to a raw binary file. For example, with "kdu_expand" by Kakadu Software (http://www.kakadusoftware.com/index.php).

[djellison]

Just playing with the 64 ppd for now - but great stuff!!

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[mhoward]

thanks for finding that out

Thanks for fixing it. It looks right to me now.

With that fixed, here's a direct comparison between a Moon Globe using the available LALT data, and the same view using the new LOLA data. The LOLA-based view wins. I'm really surprised that the LOLA data is this sharp this early.

Attached thumbnail(s)

 

[elakdawalla]

OK folks, I am stumped. I have downloaded a couple of LROC images but cannot manage to open and work with them. Photoshop CS3 chokes on them when I attempt to open as raw using the width and height specified in the header. IMG2PNG refuses to convert them to PNG format. NasaView can open the image but converts down to 8 bit mode as it does so, and the contrast is so low that all of the pixels are in like 7 of the DNs. I tried GIMP (I have the PDS import filter installed) but it just hangs. What else can I try on a Windows machine? Help!!

[djellison]

Emailing someone with ISIS is probably your best bet.

Alternatively, try ImageJ and importing a raw into that.

[Rick Sternbach]

I'm not terribly savvy about all of the data products that are coming, but are we going to see a full cylindrical "texture map" type of image, a la what we saw with Clementine? A giant WAC mosaic of some kind? - Rick

[JohnVV]

IMG2PNG might not work for them

i have found that not just the *.lbl BUT the .img files for the
LDEM_4.LBL
LDEM_4.IMG
LDEM_16.LBL
LDEM_16.IMG
LDEM_64.LBL
LDEM_64.IMG

all of the lbl's are F-'ed up ( this is NOT an exaggeration)

the headers state 3 different bit formats and as 16 bit
the IMG files ARE 32 bit
however ther really are 16 bit images saved as 32 bit ???
also the "SCALING_FACTOR" and "OFFSET" are off
yes this is messed up
this is the LBL for the LDEM_64.IMG
that i just made , and WORKS
this opens it as a 16 bit image

CODE

PDS_VERSION_ID            = "PDS3"
/*** FILE FORMAT ***/
FILE_RECORDS              = 11520
RECORD_TYPE               = FIXED_LENGTH
RECORD_BYTES              = 46080
^IMAGE                    = "LDEM_64.IMG"
/*** GENERAL DATA DESCRIPTION PARAMETERS ***/
PRODUCT_VERSION_ID        = "V1 revision F"                                        
DATA_SET_ID               = "LRO-L-LOLA-64-GDR-V1.0"
PRODUCT_ID                = "LDEM_64.IMG"
INSTRUMENT_HOST_NAME      = "LUNAR RECONNAISSANCE ORBITER"              
INSTRUMENT_NAME           = "LUNAR ORBITER LASER ALTIMETER"              
INSTRUMENT_ID             = "LOLA"
COORDINATE_SYSTEM_NAME    = "MEAN EARTH/POLAR AXIS OF DE421"
MISSION_PHASE_NAME        = {"COMMISSIONING","NOMINAL MISSION"}
TARGET_NAME               = MOON
START_TIME                = 2009-07-13T17:33:17.246
STOP_TIME                 = 2009-12-17T19:42:52.026                      
PRODUCT_CREATION_TIME     = 2010-03-01T00:00:00
PRODUCER_ID               = LRO_LOLA_TEAM
PRODUCER_FULL_NAME        = "DAVID E. SMITH"
PRODUCER_INSTITUTION_NAME = "GODDARD SPACE FLIGHT CENTER"
DESCRIPTION               = "This data product is a shape map (radius)
   of the Moon at a resolution of 64 pixels per degree"

OBJECT                    = IMAGE
  NAME                    = HEIGHT
  DESCRIPTION             = ""
  LINES                   = 11520
  LINE_SAMPLES            = 23040
  SAMPLE_TYPE             = LSB_UNSIGNED_INTEGER
  SAMPLE_BITS             = 16
  UNIT                    = METER
  SCALING_FACTOR          = 1.0
  OFFSET                  = 0
END_OBJECT                = IMAGE

OBJECT                    = IMAGE_MAP_PROJECTION
^DATA_SET_MAP_PROJECTION = "DSMAP.CAT"
MAP_PROJECTION_TYPE      = "SIMPLE CYLINDRICAL"
A_AXIS_RADIUS            = 1737.4 <KM>
B_AXIS_RADIUS            = 1737.4 <KM>
C_AXIS_RADIUS            = 1737.4 <KM>
FIRST_STANDARD_PARALLEL  = "N/A"
SECOND_STANDARD_PARALLEL = "N/A"
POSITIVE_LONGITUDE_DIRECTION = "EAST"
CENTER_LATITUDE          = 0.0 <DEGREE>
CENTER_LONGITUDE         = 180.0 <DEGREE>
REFERENCE_LATITUDE       = "N/A"
REFERENCE_LONGITUDE      = "N/A"
LINE_FIRST_PIXEL         = 1
LINE_LAST_PIXEL          = 11520
SAMPLE_FIRST_PIXEL       = 1
SAMPLE_LAST_PIXEL        = 23040
MAP_PROJECTION_ROTATION  = 0.0
MAP_RESOLUTION           = 64.0 <PIXEL/DEGREE>
MAP_SCALE                = 0.47375 <KM/PIXEL>
MAXIMUM_LATITUDE         = 90.0 <DEGREE>
MINIMUM_LATITUDE         = -90.0 <DEGREE>
WESTERNMOST_LONGITUDE    = 0.0 <DEGREE>
EASTERNMOST_LONGITUDE    = 360.0 <DEGREE>
LINE_PROJECTION_OFFSET   = 0.0
SAMPLE_PROJECTION_OFFSET = 0.0
COORDINATE_SYSTEM_TYPE   = "BODY-FIXED ROTATING"
COORDINATE_SYSTEM_NAME   = "MEAN EARTH/POLAR AXIS OF DE421"
END_OBJECT                = IMAGE_MAP_PROJECTION

END

however you will find that in isis the map projection is off .It is in sym cyl BUT the lat/long are way off
you will need to run maplab on it