FORMAT OF WISC 98/99 AEROMAG ASCII FILES


(Original sampling interval is 1/10 second)
(Winnowed sampling interval is 1 second)


FORMAT*  VARIABLE**  DESCRIPTION                            UNITS
-------  ----------  --------------------------------------------
  a6     aline       Flightline number       SNNNV (see below)***
  a2     adir        Flightline direction                 N,S,E,W
  f10.4  rlon        Longitude                    decimal degrees
  f10.4  rlat        Latitude                     decimal degrees
  f10.1  rutmx       Utm easting                           meters
  f10.1  rutmy       Utm northing                          meters
  f9.1   rfid        Fiducial number       UTC seconds of the day
  i3     iyr         Year minus 1900                        years
  i3     ijd         Day of the year                         days
  i4     ih          UTC hour of the day                    hours
  i4.3   ims         100(min of the hour)+(sec of the min)   mmss
  f8.2   rrdr        Radar altitude                        meters
  f7.1   rbar        Barometric altitude                   meters
  f7.1   rgalt       Gps altitude                          meters
  f10.2  rdiu        Basemag correction                nanoTeslas
  f10.2  rmraw       Aeromag, raw                      nanoTeslas
  f10.2  rmdiuc      Aeromag, basemag corrected        nanoTeslas
  f10.2  rmigrc      Aeromag, igrf corrected           nanoTeslas
  f10.2  rmlev       Aeromag, leveled                  nanoTeslas
  17x
-------  ----------  --------------------------------------------


*    = The format is standard Fortran 77.


**   = The variable is a mnemonic in which the first character is
       the variable type as follows:

           a = alpha-numeric (string)
           i = integer
           r = real


***  = The flight line numbers follow the pattern, SNNNV, where:

           S   = Section number:  blank, 1, 2, 3, 5
           NNN = Flight-line Number progressing from 1 at the
                 east to over 500 at the west edge.
           V   = Version number for reflights, usually 0, 1, 2



THE FILE NAME FORMAT


All line-data file names follow the pattern, lnXNN.YYY, where:

ln   = A standard prefix meaning LINE DATA (point-data arranged
       by flight lines).

X    = Indicates whether decimal numbers in the ascii files have
       been formatted with a leading zero when their values are
       less than one.  The following possibilities apply:

           0 = Leading zero's are used in the format (e.g. -0.89)
           _ = No leading zero's are used (e.g. -.89)
           c = A place-holder used in all the compressed file
               names, which indicates that it is unknown whether
               the file will uncompress with or without leading
               zeros.  This formatting aspect is dependent upon
               the operating system and uncompression program
               used.

NN   = The file number (01 - 12, 21, 31).

.YYY = The file type as follows:

           .asc = ASCII data file, which is the same as a text
                  (.txt) file, except the records are longer,
                  being 160 data characters plus 1 or 2 hidden
                  record-terminator characters.
           .bin = BINARY compressed-data file, which when
                  uncompressed (using the appropriate program)
                  will yield an ASCII data file (.asc).