File name code

Below is a chart that will help you decode the 27 character file names 
associated with the MER missions. There is enough info below to allow you 
to make stereograms and construct color pictures and determine when and 
where the raw images were taken. Enjoy!

----

Character   Function

1	 Spacecraft ID
                1 = Opportunity
                2 = Spirit

2	 Camera
                F = Forward HAZCAM
                R = Rear HAZCAM
                N = NAVCAM
                P = PANCAM
                M = Microscopic Imager
		E - EDLcam (Descent Imager)

3 to 11	Spacecraft clock
		This is the number of seconds since January 1, 2000 
		at 11:58:55.816 UTC.

12 to 14 Product type
		Product types are differentiated as having camera-induced 
		distortion removed (geometrically "linearized") or not 
		removed (nominal), and, as being thumbnail-sized or not. 
		Four special flag characters follow:

	a) Beginning E - Type of EDR, which are raw with no camera model 
	   linearization or radiometric correction. If no beginning E , 
	   then it is a Reduced Data Record (RDR).
	b) Ending T - EDR or RDR that is Thumbnail -sized.
	c) Ending L - If no beginning E , denotes an RDR that is 
	   Linearized, except for Thumbnail sized RDRs.
	d) Ending N - If no beginning E , denotes an RDR that is 
	   ThumbNail-sized and Linearized .

	Valid values for MER camera instrument input data products:
		Data Product		Identifier
		--------------------	----------
		full frame EDR		EFF
		Sub-frame EDR		ESF
		Downsampled EDR		EDN
		Thumbnail EDR		ETH
		Row Summed EDR		ERS
		Column Summed EDR	ECS
		Reference Pixels EDR	ERP
		Histogram EDR		EHG

15 to 16 Site number
	Site location count (indicates rover's location).
	Valid values: 00 , 01 , 02, ... 99, A0, A1, ..., A9, AA, AB ... etc.

17 to 18 Drive number
	Position-within-Site count (indicates rover's position within site)
	Valid values: 00 , 01 , 02, ... 99, A0, A1, ..., A9, AA, AB ... etc.

19 to 23 Command sequence number (one letter, 4 numbers)
	Denotes a group of images that were all obtained within a single 
	command sequence.

	Valid values for character (position 1) in field:
		C - Cruise
		D - IDD & RAT
		E - Engineering
		F - Flight Software (Seq rejected)
		G - (spare)
		K - (spare)
		M - Master (Surface only)
		N - In-Situ instr. (APXS, MB, MI)
		P - PMA & Remote Sensing instr. (Pancam, Navcam, Hazcam, MI, 
		    Mini-TES)
		R - Rover Driving
		S - Submaster
		T - Test
		W - Seq triggered by a Communications Window
		X - Contingency
		Y - (spare)
		Z - SCM Seqs

	Valid values for integers (positions 2 thru 5) in field:

		0000 thru 4095 - Valid Sequence number, commanded by Ground

	If P in character position 1:
		0000 through 0499 - Misc. imaging setup/parm sequences
		0500 through 0999 - Unallocated, for possible future use
		1000 through 1499 - Hazcam sequences
		1500 through 1999 - Navcam sequences
		2000 through 2899 - Pancam sequences
		2900 through 2999 - MI sequences
		3000 through 3999 - Mini-TES sequences
		4000 through 4095 - Misc. PMA actuation sequences (deploy, etc.)

24	 Camera eye
                R = Right
                L = Left
		M - Monoscopic (non-stereo camera)
		N - Not Applicable

25	 Camera Filter (PANCAM only, 0 otherwise)
                LEFT CAMERA                     RIGHT CAMERA 
                1 = EMPTY (clear)               1 = 436nm (37nm Short-pass) 
                2 = 753nm (20nm bandpass)       2 = 754nm (20nm bandpass) 
                3 = 673nm (16nm bandpass)       3 = 803nm (20nm bandpass) 
                4 = 601nm (17nm bandpass)       4 = 864nm (17nm bandpass) 
                5 = 535nm (20nm bandpass)       5 = 904nm (26nm bandpass) 
                6 = 482nm (25nm bandpass)       6 = 934nm (25nm bandpass) 
                7 = 432nm (32nm Short-pass)     7 = 1009nm (38nm Long-pass) 
                8 = 440nm (20) Solar ND 5.0     8 = 880nm (20) Solar ND 5.0
See Filter Wheels on Pancam

	 Microscopic Imager "Filter" positions:

	 1. MI window/cover closed (500-700 nm response)
	 2. MI window/cover open (400-700 nm response)

26	 Product producer
		A - Arizona State University
		C - Cornell University
		F - USGS at Flagstaff
		J - Johannes Gutenberg Univ. (Germany)
		M - MIPL (OPGS) at JPL
		N - NASA Ames Research (L. Edwards)
		P - Max Plank Institute (Germany)
		S - SOAS at JPL
		U - University of Arizona
		V - SSV Team (E. De Jong) at JPL
		X - Other

27	 Product version number
		Version identifier providing uniqueness for book keeping.

		Valid values: 1, 2, 3, ... 9, A, B, ... Z

Example:

A photo with the file name 2P126471340EDN0000P2303L5M1.JPG would be from 
Spirit (2), taken by the left PANCAM through the 535nm (green) filter. By 
matching the spacecraft times (in this case 126471340) with other pictures 
that have a similar time, you can find sets that were taken at the same time 
of the day. Use similar sets to build stereograms and color composites. This 
picture was downsampled (EDN) at site 0 (00) and position 0 (00) (On the 
lander in this case!) It was taken with command sequence P2303 for MIPL 
(OPGS) at JPL and is version 1.