A. Structure

The FFI descriptor for FFI 2110: two real independent variables, one unbounded and one bounded with its values recorded in the data records. Primary variables are real; auxiliary variables are real.

The file structure (pseudocode) described by the Ames format document looks like this:

NLHEAD 2110
ONAME
ORG
SNAME
MNAME
IVOL NVOL
DATE RDATE
DX(1) DX(2)
[ XNAME(s) ] s=1,2
NV
[ VSCAL(n), n=1,NV ]
[ VMISS(n), n=1,NV ]
[ VNAME(n) ] n=1,NV
NAUXV .................The first auxiliary variable is NX(m,1)
[ ASCAL(a), a=1,NAUXV ]
[ AMISS(a), a=1,NAUXV ]
[ ANAME(a) ] a=1,NAUXV
NSCOML
[ SCOM(k) ] k=1,NSCOML
NNCOML
[ NCOM(k) ] k=1,NNCOML
[ X(m,2) NX(m,1) ( A(m,a), a=2,NAUXV ) ]
[ X(i,m,1) ( V(i,m,n), n=1,NV ) ] i=1,NX(m,1)

Let’s break it down line-by-line:

The first 7 lines are identical to FFI 1001 file type and described in Section 3B.

DX(1): THIS WILL NOT BE USED HERE. FYI: this value represents the intervals for the bounded independent variable (e.g., GeoAltitude).

DX(2): this is the sampling interval for the unbounded independent variable (e.g., UTC); the same details/restrictions apply as they do to the sampling interval in FFI 1001 file type.

[ XNAME(s) ] s=1,2: here you list the names for the 2 independent variables starting with the bounded variable (e.g., GeoAltitude), then the unbounded variable (e.g., UTC).

NV: represents the total number of Primary variables. ALL Primary variables are arrays.

[ VSCAL(n), n=1,NV ] : analogous to FFI 1001 file type.
[ VMISS(n), n=1,NV ] : analogous to FFI 1001 file type.
[ VNAME(n) ] n=1,NV: analogous to FFI 1001 file type.

NAUXV .................The 1st* auxiliary variable is NX(m,1)
- NX(m,1) = Dimension; total number of values for Primary variables (i.e., array size)

[ ASCAL(a), a=1,NAUXV ]: analogous to Primary variables description (see above)
[ AMISS(a), a=1,NAUXV ]: analogous to Primary variables description (see above)
[ ANAME(a) ] a=1,NAUXV: analogous to Primary variables description (see above)

NSCOML
[ SCOM(k) ] k=1,NSCOML: analogous to FFI 1001 file type

NNCOML
[ NCOM(k) ] k=1,NNCOML: analogous to FFI 1001 file type

The Data Section:
[ X(m,2) NX(m,1) ( A(m,a), a=2**,NAUXV ) ]
[ X(i,m,1) ( V(i,m,n), n=1,NV ) ] i=1,NX(m,1)

Each data record contains UTC, Auxiliary and Primary variables:
- Each data record always begins with UTC; the next vlaue will be the Primary variable(s)’ dimension, then the values for the rest of the Auxiliary variables. All of these values from UTC to NAUXV are listed on one line.

The next “NX(m,1)” lines (i.e., 1 thru ArraySize) display the bounded independent variable and all Primary variables’ values in "a column format" starting with bounded independent variable:

- the 1st line in the section will display the first value of the bounded independent variable and the first value for each Primary variable.
- the 2nd line will display the second value of the bounded independent variable and the second value for each Primary variable.
- . . .
- etc.

* {when Start/Stop/Mid-point Sampling Intervals used: the 1* becomes "3"; and variables are listed as follows: UTC_Stop, UTC_Mid, and NX(m,1)}.

** {when Start/Stop/Mid-point Sampling Intervals used: the 2** becomes "4"}.

In the Header Normal Section, please include all KEYWORD/VALUE pairs. If LODs are to be used, then try to use one ULOD_FLAG and one LLOD_FLAG for all parameters. Also to remember that LODs DO NOT apply to Independent variables.

For example (Header Normal Section):

ULOD_FLAG: -7777 (i.e., ALL parameters will use –7777 for their ULOD_FLAG)
ULOD_VALUE: ulod_Vi-2, ulod_Vi-1; ulod_Vi; ulod_Vi+1; . . . . ; ulod_Vn
[where,
{if Start/Stop/Mid-point Sampling Intervals used, then enter N/A; N/A; for UTC_Stop and UTC_Mid (i.e.: ulod_Vi-2;ulod_Vi-1= NA;NA;)}
ulod_Vi = ULOD_arraySize (normally, this will be N/A;)
ulod_Vi+1 = ULOD_NextAuxVar
.
ulod_Vn = ULOD_Last_PRIMARY_VAR
]

Use similar procedure for LLODs. Enter N/A for variables that do not use LODs.

Below is an example for clarification.

EXAMPLE [Start/Stop/Mid-point Intervals Sampling]
File name: AROTAL-RAY_DC8_20040715_R0.ict

61 2110
PI LastName, First Name
Code 916, Goddard Space Flight Center, Greenbelt, MD 20771
AROTAL
PAVE Mission
1 1
2004 07 15 2006 01 18
0.0
Altitude, meters
UT of data, XX.XXXX hours from 0 hours on flight date
7
0.1 0.0001 0.1 0.01 0.0001 0.1 .0001
-9999 -999999 -9999 -9999 -999999 -999999 -999999
Temperature, K
Log base 10 of Number density, part/cc
Temperature error, K
Aerosol, Klet
Log base 10 of Ozone number density, part/cc
Ozone mixing ratio, ppb
Log base 10 of Ozone number density error, part/cc
13
1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0
-9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999
Stop_UT of data, XX.XXXX hours from 0 hours on flight date
Mid_UT of data, XX.XXXX hours from 0 hours on flight date
Number of altitudes reported, Number
Year, UT
Month, UT
Day, UT
Averaging time of presented data, xxx.x minutes
Latitude, degrees
Longitude, degrees
pressure altitude, meters
GPS altitude, meters
Static air temperature, K
SZA, degrees
4
Data version 0 - archived in the field, preliminary in nature and subject to change in the near future.
These T and O3 values were retrieved using only Rayleigh data (355 & 308nm).
Thus they can be affected by aerosols, PSCs and low (< 97 degrees) SZA.
The archived profile is formed from a 4 min. running average of 20 sec. integrated data sets.
19
PI_CONTACT_INFO: Enter PI Address here
PLATFORM: NASA DC8
LOCATION: Lat, Lon, and Alt included in the data records
ASSOCIATED_DATA: N/A
INSTRUMENT_INFO:
DATA_INFO:
UNCERTAINTY:
ULOD_FLAG: -7777
ULOD_VALUE: N/A;
LLOD_FLAG: -8888
LLOD_VALUE: N/A;
DM_CONTACT_INFO: Enter Data Manager Info here
PROJECT_INFO: PAVE MISSION: Jan-Feb 2005
STIPULATIONS_ON_USE: Use of these data should be done in consultation with the PI
OTHER_COMMENTS:
REVISION: R1; R0
R1: Minor calibrations were done; however, future revisions are expected.
R0: No Comments
BegTime EndTime MidTime NumAlts Year Month Day AvgTime Latitude Longitude PAlt GpsAlt SAT_K SZA Altitude[] TempK[] Log10_NumDensity[] TempK_Err[] AerKlet[] Log10_O3NumDensity[] O3_MR[] Log10_O3NumDensity_Err[]
14.8283 14.8293 14.8288 9 2005 2 3 0 42.308 -70.582 6910 6979 242.5 65.5
     9154 -9999 -999999 -9999 -9999 113178 212 -999999
     9304 -9999 -999999 -9999 -9999 123353 2250 -999999
     9454 -9999 -999999 -9999 -9999 123008 2116 -999999
     9604 -9999 -999999 -9999 -9999 120933 1337 -999999
     9754 -9999 -999999 -9999 -9999 119675 1019 -999999
     9904 -9999 -999999 -9999 -9999 122655 2061 -999999
     10054 -9999 -999999 -9999 -9999 124384 3126 -999999
     10204 -9999 -999999 -9999 -9999 124632 3371 -999999
     10354 -9999 -999999 -9999 -9999 121341 1609 -999999
14.8342 14.8352 14.8347 8 2005 02 03 0 42.278 -70.613 6978 7043 241.7 65.5
     10118 9999 -999999 -9999 -9999 124458 3205 -999999
     10268 -9999 -999999 -9999 -9999 123160 2421 -999999
     10418 -9999 -999999 -9999 -9999 121221 1582 -999999
     10568 -9999 -999999 -9999 -9999 120950 1523 -999999
     10718 -9999 -999999 -9999 -9999 117339 680 -999999
     10868 -9999 -999999 -9999 -9999 122751 2423 -999999
     11018 -9999 -999999 -9999 -9999 124230 3491 -999999
     11168 -9999 -999999 -9999 -9999 124039 3424 -999999