Standard SIR File Naming Scheme  - BYU MERS LAB Aug. 2017
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General SIR file name format:

SENS-T-REGYR-DY1-DY2.RCN

where
SENS = Sensor (4 char):
        AMCp = AMSR-E where M=LTOD n: noon m: midnight, 
	   C=channel (below), p=polarization (h,v)
	    6 GHz (channel index C=1)
	    10 GHz (channel index C=2)
	    18 GHz (channel index C=3)
	    23 GHz (channel index C=4)
	    36 GHz (channel index C=5)
	    89 GHz (channel index C=6) 
	ers1 = ERS1 (v-pol)
	ers2 = ERS2 (v-pol)
	nscv = NSCAT V
	nsch = NSCAT H
        msfa = ASCAT (V pol) 
	sash = SASS v-pol
	sasv = SASS v-pol
	FXXY = SSM/I platform FXX, channel index Y
			19V (channel index 1)
			19H (channel index 2)
			22V (channel index 3)
			37V (channel index 4)
			37H (channel index 5)
			85V (channel index 6)
			85H (channel index 7)
	topo = TOPO (topography map)
	ouev = OScat egg outer (V) beam*
	oueh = OScat egg inner (H) beam*
	ousv = OScat slice outer (V) beam*
	oush = OScat slice inner (H) beam*
	prtr = TRMM Precipitation Radar
	quev = QuikScat egg outer (V) beam*
	queh = QuikScat egg inner (H) beam*
	qusv = QuikScat slice outer (V) beam*
	qush = QuikScat slice inner (H) beam*
	swev = Seawinds egg outer (V) beam*
	sweh = Seawinds egg inner (H) beam*
	swsv = Seawinds slice outer (V) beam*
	swsh = Seawinds slice inner (H) beam*
	sqev = Tandem Seawinds and QuikSCAT egg outer (V) beam
	sqeh = Tandem Seawinds and QuikSCAT egg inner (H) beam
	sqsv = Tandem Seawinds and QuikSCAT slice outer (V) beam
	sqsh = Tandem Seawinds and QuikSCAT slice inner (H) beam
        misc = misc. sensor
	???? = other
  * second letter can also be 'a'=ascending only, 'd'=descending only
    of the local-time-of-day (LTOD) codes 'm', 'n', 'e'

T = type (1 char)   (header itype value in parenthesis)
 	a  (1,3) = A image (sigma-0 in dB or TB in deg)
 	b  (2) = B image (slope of sigma-0 in dB/deg)
 	c  (4) = C image (2nd order curvature of sigma-0 in dB/deg**2)
	C  (8) = counts or hits (measurements) per pixel
 	d  (5) = D image (3rd order curvature of sigma-0 in dB/deg**3)
	E (21) = Sigma-0 error image (dB)
	h (19) = height (in m)
 	I  (7) = incidence angle standard deviation (in deg)
 	J  (9) = average incidence angle (in deg)
 	m  (0) = mask image
 	N  (6) = counts of negative sigma-0 values
	p (11) = pixel time estimate (in min from start of image interval)
	q (32) = magnitude of 1st harmonic of azimuth modulation (dB)
	Q (32) = magnitude of 3rd harmonic of azimuth modulation (dB)
	r (33) = phase angle of 1st harmonic of azimuth modulation (deg)
	R (36) = phase angle of 3rd harmonic of azimuth modulation (deg)
	s (34) = magnitude of 2nd harmonic of azimuth modulation (dB)
	S (37) = magnitude of 4th harmonic of azimuth modulation (dB)
	S (12) = count of small sigma-0 values
	t (35) = phase angle of 2nd harmonic of azimuth modulation (deg)
	T (38) = phase angle of 4th harmonic of azimuth modulation (deg)
	T  (3) = Tb brightness temperature (in K)
	u (36) = Sigma-0 standard deviation image w/Az second order mod removed (dB)
	U (39) = Sigma-0 standard deviation image w/Az fourth mod removed (dB)
	v (10) = vegetation index
	V (22) = Sigma-0 standard deviation image (dB)
	w (46) = wind direction image (deg)
	W (16) = mean wind speed image (m/s)
	x (30) = longitude image (deg)
	y (31) = latitude image (deg)
	Y (17) = wind speed standard deviation image (m/s)
	X  (?) = misc.
	z (45) = angle of image grid w/respect to north (deg)

REG = Region (3 char)  This is a partial list of the standard regions and
                       there corresponding numerical codes: (see below)
	Ama =   (1) Amazon
	Con =   (2) Congo
	Ant = (100) Antarctica
	Arc = (110) Artic
	Grn = (202) Greenland
	Ala = (203) Alaska
	CAm = (204) Central America 
	NAm = (205) North America 
	SAm = (206) South America 
	NAf = (207) North Africa
	SAf = (208) South Africa
	Sib = (209) Siberia
	Eur = (210) Europe
	SAs = (211) South Asia
	ChJ = (212) China-Japan
	Ind = (213) Indonesia
	Aus = (214) Australia
	Bor = (254) Borneo
	Con = (255) Congo
	Ber = (256) Bering Sea
	Ice = (257) Iceland
	Wil = (259) Wilkes Land
        Glb = (500) Globe
	E2N = (308) EASE2 Northern Hemisphere
        E2S = (309) EASE2 Southern Hemisphere
        E2T = (310) EASE2 Tropical/Mid-latitude Globe
        EaN = (311) EASE Northern Hemisphere
        EaS = (312) EASE Southern Hemisphere
        EaG = (313) EASE Globe
        Cus = (yyy) custom region
        xxx = (yyy) custom region
 
YR = year (2 char)
	eg. - 78, 90, ..., 99, 00, 01, ..., etc.

DY1 = 1st day of data used to make image (3 char) (Julian Day of year)
	eg. - 001, ..., 365 

DY2 = End day of data used in image (3 char) (Julian Day of year)
	if imaging time crosses year boundary, DY2 < DY1

RCN = Reconstruction technique (3 char):
	sir = sir or sirf
	ave = ave image algorithm
	non = nonenhanced
	grd = gridded

        lis = list information file


Special Extensions:
-------------------

The following extensions are added to the end of the filename to
identify other image types:


.lmsk  = Land masked image
.imsk  = Ice masked image
.omsk  = Ocean masked image
.dif   = Difference image
.diff  = Difference image
.sr    = Subregion extracted image
.ed    = Manually edited image
.lmask = land mask image
.ie    = ascii sea ice extent image

Last revised:  9 Aug. 2017