Phoenix SSI Reference Material Options

[djellison]

Finally - I found an image of the Phoenix SSI with, I presume, two spare MER CCD's inside

http://www.lpi.usra.edu/meetings/lpsc2008/pdf/2156.pdf

It's sprouted a big lump on top of the white cylinder MPF and MPL design, due, I presume, to the use of two CCDs instead of one.

Doug

[Deimos]

Additional information is online.

http://www.met.tamu.edu/mars/

Mark

[elakdawalla]

Oooohh...juicy info that only a true space enthusiast could love...

Decoding SSI filenames
Note that there's an indicator in the filename for whether the image is part of a mosaic or stereo observation (or both). Coool!

Et cetera...

And how the heck did I miss the fact that you were the lead for SSI, Mark?

Is there anything you can tell us about the nominal plan for the pipeline for images? Peter Smith said at today's press briefing that "they will be made available on the Internet as they come down. You'll see them as I see them. We plan to operate the mission in an open manner." Which I had heard was true but it was very nice to hear him say that in the official context of the press briefing.

Can you hear that? That's the sound of me rubbing my hands and licking my lips -- I can't wait to see new data from a new spacecraft!

--Emily

[climber]

From Mark links, I hope to this very soon (with another background):

[djellison]

Can you hear that?

It's also the sound my me click the PTGui icon. Rapidly.

doug

[mhoward]

Oooohh...juicy info that only a true space enthusiast could love...

Also, in the downloadable version of the Phoenix clock, the index.html file gives the source code for converting to "Phoenix" time. Cool.

One question on the Phoenix filenames information: Is the spacecraft clock time interpreted the same way as MER's? Ie, "number of seconds since January 1, 2000 at 11:58:55.816 UTC".

Also, I could ask if there are any plans to release metadata, especially camera pointing information, for the images... but I don't want to bother Mark as we get into suspense time here.

[slinted]

Here's a rough graphic showing the hue through the SSI filters in visible light using the center wavelength and FWHM from the SSI site. I've excluded the solar filters, the two diopters, and all the infrared filters to focus on the filters that can be used for color images of the surrounding terrain.


Full Res

[mhoward]

I just found out something remarkable via #space. The 'large' size images on fawkes have metadata tags embedded in the JPG. Just open the JPG file up in a text editor to see.

[elakdawalla]

Remarkable...yes...

OK, mhoward, why haven't you unveiled the Midnight Phoenix Browser yet?

--Emily

[slinted]

Sorry I didn't point this out earlier. I thought it was mentioned in yesterdays main thread. It's a meta-data dream come true! The large version images on the LPL site each have a caption and a series of tags embedded in the "Comments" section of the JPEG headers. Exiftool might be a good tool for recovering them. The Python Imaging Library can also read them (specifically, the app["COM"] method of an Image object).

Here's what the tags look like for a raw image (lg_532.jpg):

This image was acquired at the Phoenix landing site on day XX_DAY_NUMBER_XX of the mission on the surface of Mars, or Sol 1, after the May 25, 2008, landing. The SURFACE STEREO IMAGER RIGHT acquired this image at 14:49:43 local solar time. The camera pointing was elevation -25.8395 degrees and azimuth 280.315 degrees.

PRODUCT_ID = "SS001EFF896308546_10D10RAM1"
FRAME_ID = "RIGHT"
FRAME_TYPE = "MONO"
INSTRUMENT_NAME = "SURFACE STEREO IMAGER RIGHT"
LOCAL_TRUE_SOLAR_TIME = "14:49:43"
RELEASE_ID = "0001"
SOLAR_LONGITUDE = 77.1473
FILTER_NAME = "SSI_R10_604NM"
EXPOSURE_DURATION = 408.0
INSTRUMENT_AZIMUTH = 280.315
INSTRUMENT_ELEVATION = -25.8395
PLANET_DAY_NUMBER = 1

[ahecht]

Also, in the downloadable version of the Phoenix clock, the index.html file gives the source code for converting to "Phoenix" time. Cool.

I used that page to create a Google Gadget so that you can have the Phoenix Mars Local Mean Time on your Google homepage:
http://www.google.com/ig/adde?hl=en&mo...419/phxtime.xml

[algorimancer]

...Is the spacecraft clock time interpreted the same way as MER's? Ie, "number of seconds since January 1, 2000 at 11:58:55.816 UTC".

Seems to be from 1980.0 (UTC).

In APG I handle the conversion from the system clock to Sol & Local time something like this:

#define SECSPERSOL 88775.244
#define PHX_SOL0 896166627//seconds since 1980.0
unsigned int uiSysClock,uiSol,uiH,uiM,uiS;
uiSol=(unsigned int) ((uiSysClock-PHX_SOL0)/SECSPERSOL);
uiSysClock=uiSysClock-(((unsigned int)uiSol*SECSPERSOL)+PHX_SOL0);
uiH=uiSysClock/3600;
uiSysClock=uiSysClock%3600;
uiM=uiSysClock/60;
uiS=uiSysClock%60;

I just figured this out from a variety of sources (and yes, the code could be a tad better optimized), but it seems to match the image products. One difference from MER is that the first Sol is Sol 0 for Phoenix as opposed to Sol 1.

[algorimancer]

...The 'large' size images on fawkes have metadata tags embedded in the JPG.

That is indeed interesting... now if we just had some handy utility to batch download the images and correct the file names.

[pechisbeque]

I used that page to create a Google Gadget so that you can have the Phoenix Mars Local Mean Time on your Google homepage

That's really nice! Is there also one for the Rovers?

[jamescanvin]

That is indeed interesting... now if we just had some handy utility to batch download the images and correct the file names.

Well I kind of have something that does that, however it is in no way ready for general use (particularly as most of you will be using Windows). However I have chucked the results on the web if it is any help to anyone:

http://www.nivnac.co.uk/phoenix/raws/

I'll try and keep it up to date. I've included a .zip of each sol to save some effort downloading.

Now that's done, time to get my MER panorama software to recognize Phoenix data.

James