File format for meteorology, oceanography, and wave spectra data from buoys (NODC F291 format)


THIS FORMAT IS USED TO REPORT METEOROLOGICAL, OCEANOGRAPHIC, AND WAVE SPECTRA DATA FROM NDBC MOORED BUOYS AND FIXED LAND STATIONS. THE FORMAT CONTAINS THIRTEEN DATA RECORD TYPES TO:

****NOTE****

THIS FORMAT REPLACES FILE TYPE 191 WHICH IN TURN REPLACED 091.

03/30/81 - ADDED WIND SPEED AND DIRECTION TO RECORD TYPE '2'
12/28/81 - ADDED RECORD TYPES '6' AND '7'
11/04/85 - ADDED RECORD TYPE '8'
01/01/88 - ADDED RECORD TYPE '9'
01/30/91 - DESIGNED F291 TO:

05/01/92 - REFINED DEFINITION OF OBSERVED TIME IN RECORDS A THROUGH J TO BE "END OF MET. DATA ACQUISITION, ROUNDED TO THE BEGINNING OF THE NEAREST WHOLE MINUTE." TIME TAG OF DATA ARCHIVED PRIOR TO THIS DATE REFLECTS NEAREST WHOLE HOUR OF MET. DATA ACQUISITION. ALSO, FOR RECORD C, BLANK SPACES 27-30 ARE DEFINED AS "END OF WAVE DATA ACQUISITION, ROUNDED TO THE BEGINNING OF THE NEAREST WHOLE MINUTE."

01/01/95 - ADDED TWO NEW RECORDS TO 291 TO HANDLE WPM DATA:

03/17/2000 - FOUR DIGIT YEAR

04/21/2000 - ADDED NEW COMMENT RECORD M

RECORD FORMAT DESCRIPTION
RECORD NAME: Meteorology Oceanography & Wave Spectra (File Type "291")
DESCRIPTIVE HEADER RECORD (RECORD A)
PARAMETERSTARTING POSITIONFIELD LENGTHDESCRIPTION
FILE TYPE 1 3 "291" (constant)
OBS YEAR/MONTH 4 6 YYYYMM of Observation
RECORD TYPE 10 1 Always 'A'
STATION 11 6 Six-character unique name of observation point
OBSERVED DATE 17 6 YYMMDD (UTC)
OBSERVED TIME 23 4 HHMM (UTC) - End of met. data acquisition, rounded to beginning of nearest whole minute
LATITUDE 27 7 DDMMSS plus hemisphere 'N' or 'S'
LONGITUDE 34 8 DDDMMSS plus hemisphere 'E' or 'W'
BOTTOM DEPTH 42 5 XXXXX - Meters to tenths
MAGNETIC VARIATION 47 4 XXXX - Whole degrees from true North (signed value)
BUOY HEADING 51 3 XXX - Whole degrees from true North
SAMPLING RATE (WAVES) 54 4 XXXX - Original measurements per minute to tenths
SAMPLING DURATION (WAVES)* 58 4 XXXX - Minutes to hundredths If equal to 40 minutes, the actual duration for all wave calculations varies by frequency range: .02 to .925 Hz - 40 min .1 to .35 Hz - last 20 min .365 to .485 Hz- last 10 min
TOTAL INTERVALS (WAVES) 62 3 XXX - Number of frequency intervals
CHIEF SCIENTIST 65 20 20-Character field for scientist name
INSTITUTION 85 20 20-Character field for data source
WIND SAMPLING DURATION 105 3 XXX - Minutes to tenths
PRESENCE OF RECORD 'B' 108 1 X - Y=YES; N=NO
PRESENCE OF RECORD 'C' 109 1 X - Y=YES; N=NO
PRESENCE OF RECORD 'D' 110 1 X - Y=YES; N=NO
PRESENCE OF RECORD 'E' 111 1 X - Y=YES; N=NO
PRESENCE OF RECORD 'F' 112 1 X - Y=YES; N=NO
PRESENCE OF RECORD 'G' 113 1 X - Y=YES; N=NO
PRESENCE OF RECORD 'H' 114 1 X - Y=YES; N=NO
PRESENCE OF RECORD 'I' 115 1 X - Y=YES; N=NO
PRESENCE OF RECORD 'J' 116 1 X - Y=YES; N=NO
PRESENCE OF RECORD 'K' 117 1 X - Y=YES; N=NO
PRESENCE OF RECORD 'L' 118 1 X - Y=YES; N=NO
BLANKS 119 2

ENVIRONMENTAL DATA RECORD (RECORD B)
PARAMETERSTARTING POSITIONFIELD LENGTHDESCRIPTION
FILE TYPE 1 3 "291" (constant)
OBS YEAR/MONTH 4 6 YYYYMM of Observation
RECORD TYPE 10 1 Always 'B'
STATION 11 6 Six-character unique name of observation point
OBSERVED DATE 17 6 YYMMDD (UTC)
OBSERVED TIME 23 4 HHMM (UTC) - End of met. data acquisition, rounded to beginning of nearest whole minute
ANEMOMETER HEIGHT 27 3 XXX - Height above water level or ground (meters to tenths)
AIR TEMPERATURE 30 4 XXXX - Negative temperatures are preceded by a minus sign adjacent to tempera- ture value Deg C to tenths
DEW POINT 34 4 XXXX - Degrees C to tenths
BAROMETER 38 5 XXXXX - Reduced to sea level (MB to tenths)
WIND SPEED (AVG) 43 4 XXXX - m/sec to hundredths
WIND DIRECTION (AVG) 47 4 XXXX - Degrees from true North to tenths
WEATHER 51 1 One-character weather code
VISIBILITY 52 3 XXX - Nautical miles to tenths
PRECIPITATION 55 4 XXXX - Accumulation in millimeters
SOLAR RADIATION (ATMOSPHERIC 59 3 xxx - Langleys/min to hundredths, wave length less than 3.6 microns
SOLAR RADIATION (ATMOSPHERIC) 62 3 XXX - Langleys/min to hundredths, wave length from 4.0 to 50 microns
SIGNIFICANT WAVE HEIGHT* 65 3 XXX - Corrected for low frequency noise, etc. (meters to tenths)
AVERAGE WAVE PERIOD* 68 3 XXX - Seconds to tenths
MEAN WAVE DIRECTION 71 3 XXX - Mean direction at the dominant wave period (spectral peak period) in whole degrees clockwise from true North to the direction from which the waves are coming. level; minus sign indicates below MLLW (meters to tenths)
BLANKS 78 2
TEMPERATURE (SEA SURFACE) 80 4 XXXX - Sea surface - Negative temperatures are preceded by a minus sign adjacent to temperature value-Deg C to hundredths
PRACTICAL SALINITY (SEA SURFACE) 84 5 XXXXX - To thousandths
CONDUCTIVITY (SEA SURFACE) 89 5 XXXXX - Millisiemens/cm to thousandths
DOMINANT WAVE PERIOD* 94 3 XXX - Spectral peak period- Seconds to tenths
MAXIMUM WAVE HEIGHT 97 3 XXX - Meters to tenths
MAXIMUM WAVE STEEPNESS 100 3 XXX
WIND GUST 103 4 XXXX - Meters/sec to hundredths
WIND GUST AVERAGING PERIOD 107 2 XX - Seconds
WIND GUST 109 4 XXXX - Meters/sec to hundredths
WIND GUST AVERAGING PERIOD 113 2 XX - Seconds
WIND SPEED (58 MIN AVG) 115 3 XXX - Meters/sec to tenths
WIND DIRECTION (58 MIN AVG) 118 3 XXX - Whole degrees
* Significant wave height, average wave period, and dominant wave period are set to zero when significant wave height is less than 0.15 meters.
NONDIRECTIONAL WAVE SPECTRA DATA RECORD (RECORD C)
PARAMETERSTARTING POSITIONFIELD LENGTHDESCRIPTION
FILE TYPE 1 3 "291" (constant)
OBS YEAR/MONTH 4 6 YYYYMM of Observation
RECORD TYPE 10 1 Always 'C'
STATION 11 6 Six-character unique name of observation point
OBSERVED DATE 17 6 YYMMDD (UTC)
OBSERVED TIME 23 4 HHMM (UTC) - End of met. data acquisition, rounded to beginning of nearest whole minute
END OF WAVE DATA ACQUISITION 27 4 HHMM (UTC) - Rounded to beginning of nearest whole minute
BLANKS 31 3
COUNT DATA 34 1 X - Number of frequencies on this record Up to 5 frequency, resolu- tion, and density fields. Null fields are zero or blank
FREQUENCY 35 4 XXXX - Center frequency of interval in Hertz to thousandths
RESOLUTION 39 4 XXXX - Interval width in Hertz to ten-thousandths
DENSITY 43 6 XXXXXX - Spectral Density, C11, in m2/Hz to thousandths
FREQUENCY 49 4 XXXX - See above
RESOLUTION 53 4 XXXX - See above
DENSITY 57 6 XXXXXX - See above
FREQUENCY 63 4 XXXX - See above
RESOLUTION 67 4 XXXX - See above
DENSITY 71 6 XXXXXX - See above
FREQUENCY 77 4 XXXX - See above
RESOLUTION 81 4 XXXX - See above
DENSITY 85 6 XXXXXX - See above
FREQUENCY 91 4 XXXX - See above
RESOLUTION 95 4 XXXX - See above
DENSITY 99 6 XXXXXX - See above
BLANKS 105 16

SUBSURFACE TEMPERATURE/SALINITY DATA RECORD (RECORD D)
PARAMETERSTARTING POSITIONFIELD LENGTHDESCRIPTION
FILE TYPE 1 3 "291" (constant)
OBS YEAR/MONTH 4 6 YYYYMM of Observation
RECORD TYPE 10 1 Always 'D'
STATION 11 6 Six character unique name of observation point
OBSERVED DATE 17 6 YYMMDD (UTC)
OBSERVED TIME 23 4 HHMM (UTC) - End of met. data acquisition, rounded to beginning of nearest whole minute
DEPTH 27 5 XXXXX - Meters from the surface to tenths
TEMPERATURE 32 4 XXXX - Negative temperatures are preceded by a minus sign adjacent to temper- ature value-Deg C to hundredths
PRACTICAL SALINITY 36 5 XXXXX - Parts per thousands reported to thousands
CONDUCTIVITY 41 4 XXXX - Millisiemens/cm to hundredths
DEPTH 45, 63, 81,99 5 Repeated in descending order
TEMPERATURE 50, 68, 86, 104 4 Repeated in descending order
PRACTICAL SALINITY 54, 72, 90, 108 5 Repeated in descending order
CONDUCTIVITY 59, 77, 95, 113 4 Repeated in descending order
BLANK 117 1
DURATION OF SAMPLING PERIOD 118 3 XXX - Minutes to tenths

SUBSURFACE CURRENT DATA RECORD (RECORD E)
PARAMETERSTARTING POSITIONFIELD LENGTHDESCRIPTION
FILE TYPE 1 3 Always "291"
OBS YEAR/MONTH 4 6 YYYYMM of Observation
RECORD TYPE 10 1 Always 'E'
STATION 11 6 Six character unique name of observation point
OBSERVED DATE 17 6 YYMMDD (UTC)
OBSERVED TIME 23 4 HHMM (UTC) - End of met. data acquisition, rounded to beginning of nearest whole minute
DEPTH 27 4 XXXX - From the surface in meters
PRESSURE 31 5 XXXXX - Hydrostatic pressure (kg/cm2) to hundredths
U COMPONENT 36 5 XXXXX - East component from true North (cm/sec) to tenths. Minus sign indi- cates westward component
V COMPONENT 41 5 XXXXX - True North component in cm/sec to tenths. Minus sign indicates southward component
W COMPONENT 46 3 XXX - Vertical component in cm/sec to tenths. Minus sign indicates downward component
DEPTH 49, 71, 93 4 Repeated in descending order
PRESSURE 53, 75, 97 5 Repeated in descending order
U COMPONENT 58, 80, 102 5 Repeated in descending order
V COMPONENT 63, 85, 107 5 Repeated in descending order
W COMPONENT 68, 90, 112 3 Repeated in descending order
BIN WIDTH 115 2 XX - Width of each depth bin whole meters
SAMPLING INTERVAL 117 3 XXX - Minutes to tenths
BLANK 120 1

SUBSURFACE DATA PROFILE (RECORD F)
PARAMETERSTARTING POSITIONFIELD LENGTHDESCRIPTION
FILE TYPE 1 3 Always "291"
OBS YEAR/MONTH 4 6 YYYYMM of Observation
RECORD TYPE 10 1 Always 'F'
STATION 11 6 Six-character unique name of observation point
OBSERVED DATE 17 6 YYMMDD (UTC)
OBSERVED TIME 23 4 HHMM (UTC) - End of met. data acquisition, rounded to beginning of nearest whole minute
DEPTH 27 4 XXXX - From the surface in meters. Negative value indicates height in meters above water surface
PHOTOSYNTHETIC ACTIVE RADIATION (PAR) 31 4 XXXX - Micromol/sec/m2
BLANKS 35 15 15 Blanks reserved for future parameters
DEPTH 50, 73, 96 4 Repeated in descending order
PAR 54, 77, 100 4 Repeated in descending order
BLANKS 58, 81, 104 15 Reserved for future parameters
BLANKS 119 2

CO AND QUAD SPECTRA FOR DIRECTIONAL WAVES DATA RECORD (RECORD G)
PARAMETERSTARTING POSITIONFIELD LENGTHDESCRIPTION
FILE TYPE 1 3 Always "291"
OBS YEAR/MONTH 4 6 YYYYMM of Observation
RECORD TYPE 10 1 Always 'G'
STATION 11 6 Six character unique name of observation point
OBSERVED DATE 17 6 YYMMDD (UTC)
OBSERVED TIME 23 4 HHMM (UTC) - End of met. data acquisition, rounded to beginning of nearest whole minute
FREQUENCY 27 4 XXXX - Center frequency of interval in Hz to thousandths
RESOLUTION 31 5 XXXXX - Spectral resolution of this frequency band to Hz to ten-thousandths
CO-SPECTRA (C11) 36 6 XXXXXX - Signed uncorrected spectral density of CO spectra in m2/Hz. Decimal assumed to be left of first digit. Subscripts are: 1=Heave, 2=E-W slope, 3=N-S slope
EXPONENT* 42 2 XX - First space is the sign
CO-SPECTRA (C22) 44 6 XXXXXX - See above
EXPONENT* 50 2 XX - See above
CO-SPECTRA (C33) 52 6 XXXXXX - See above
EXPONENT* 58 2 XX - See above
CO-SPECTRA (C12) 60 6 XXXXXX - See above
EXPONENT* 66 2 XX - See above
QUAD-SPECTRA (Q12) 68 6 XXXXXX - See above
EXPONENT* 74 2 XX - See above
CO-SPECTRA (C13) 76 6 XXXXXX - See above
EXPONENT* 82 2 XX - See above
QUAD-SPECTRA (Q13) 84 6 XXXXXX - See above
EXPONENT* 90 2 XX - See above
CO-SPECTRA C23) 92 6 XXXXXX - See Above
EXPONENT* 98 2 XX - See above
QUAD-SPECTRA (Q23) 100 6 XXXXXX - See above
EXPONENT* 106 2 XX - See above
SPECTRA (C22-C33) 108 6 XXXXXX - See Above
EXPONENT* 114 2 XX - See above
BLANKS 116 5
* If this exponent is less than -9, the exponent and its associated spectra will be zero.
DIRECTIONAL WAVE FOURIER COEFFICIENT DATA RECORD (RECORD H)
PARAMETERSTARTING POSITIONFIELD LENGTHDESCRIPTION
FILE TYPE 1 3 Always "291"
OBS YEAR/MONTH 4 6 YYYYMM of Observation
RECORD TYPE 10 1 Always 'H'
STATION 11 6 Six character unique name of observation point
OBSERVED DATE 17 6 YYMMDD (UTC)
OBSERVED TIME 23 4 HHMM (UTC) - End of met. data acquisition, rounded to beginning of nearest whole minute
FREQUENCY 27 4 XXXX - Hz to thousandths
RESOLUTION 31 5 XXXXX - Hz to ten- thousandths
ANGULAR FOURIER COEFF (a0) 36 6 XXXXXX - m2/Hz
EXPONENT 42 2 XX
ANGULAR FOURIER COEFF (a1) 44 6 XXXXXX - m2/Hz
EXPONENT 50 2 XX
ANGULAR FOURIER COEFF (b1) 52 6 XXXXXX - m2/Hz
EXPONENT 58 2 XX
ANGULAR FOURIER COEFF (a2) 60 6 XXXXXX - m2/Hz
EXPONENT 66 2 XX
ANGULAR FOURIER COEFF (b2) 68 6 XXXXXX - m2/Hz
EXPONENT 74 2 XX
ANGULAR FOURIER COEFF (a3) 76 6 XXXXXX - m2/Hz
EXPONENT 82 2 XX
ANGULAR FOURIER COEFF (b3) 84 6 XXXXXX - m2/Hz
EXPONENT 90 2 XX
ANGULAR FOURIER COEFF (a4) 92 6 XXXXXX - m2/Hz
EXPONENT 98 2 XX
ANGULAR FOURIER COEFF (b4) 100 6 XXXXXX - m2/Hz
EXPONENT 106 2 XX
MEAN WAVE DIRECTION 108 3 XXX - ARCTAN b1/a1 in whole degrees from true North
BLANKS 111 10

DIRECTIONAL WAVE PARAMETER DATA RECORD (RECORD I)
PARAMETERSTARTING POSITIONFIELD LENGTHDESCRIPTION
FILE TYPE 1 3 Always "291"
OBS YEAR/MONTH 4 6 YYYYMM of Observation
RECORD TYPE 10 1 Always 'I'
STATION 11 6 Six character unique name of observation point
OBSERVED DATE 17 6 YYMMDD (UTC)
OBSERVED TIME 23 4 HHMM (UTC) - End of met. data acquisition, rounded to beginning of nearest whole minute
COUNT 27 1 X - Number of frequencies on this record (1 to 3)
FREQUENCY 28 4 XXXX - Center of frequency interval in Hz to the ten- thousandth
RESOLUTION 32 4 XXXX - Resolution of interval in Hz to the ten-thousandth
R1 36 4 XXXX - Nondimensional. Given to nearest hundredth
R2 40 4 XXXX - Nondimensional. Given to nearest hundredth
WAVE DIRECTION ALPHA1 44 4 XXXX - Direction in degrees to the tenth
WAVE DIRECTION ALPHA2 48 4 XXXX - Direction in degrees to the tenth
WAVE ESTIMATE C11 52 6 XXXXXX - Spectral value in m2/Hz to the thousandth
FREQUENCY 58 4 XXXX - Center of frequency interval in Hz to the ten- thousandth
RESOLUTION 62 4 XXXX - Resolution of interval in Hz to the ten-thousandth
R1 66 4 XXXX - Nondimensional. Given to nearest hundredth
R2 70 4 XXXX - Nondimensional. Given to nearest hundredth
WAVE DIRECTION ALHPA1 74 4 XXXX - Direction in degrees to the tenth
WAVE DIRECTION 78 4 XXXX - Direction in degrees to the tenth
WAVE C11 ESTIMATE 82 6 XXXXXX - Spectral value in m2/Hz to the thousandth
FREQUENCY 88 4 XXXX - Center of frequency interval in Hz to the ten-thousandth
RESOLUTION 92 4 XXXX - Resolution of interval in Hz to the ten-thousandth
R1 96 4 XXXX - Nondimemsional. Given to nearest hundredth
R2 100 4 XXXX - Nondimensional. Given to nearest hundredth
WAVE DIRECTION ALPHA1 104 4 XXXX - Direction in degrees to the tenth
WAVE DIRECTION ALPHA2 108 4 XXXX - Direction in degrees to the tenth
WAVE C11 ESTIMATE 112 6 XXXXXX - Spectral value in m2/Hz to the thousandth
BLANKS 118 3
NOTE: DIRECTIONAL WAVE SPECTRUM = C11(f)*D(f,A), f=frequency (Hz), A=Azimuth angle measured clockwise from North to the direction wave is from. D(f,A)=(1/PI)*(0.5+R1*COS(A-ALPHA1)+R2*COS(2*(A-ALPHA2))), in which R1 and R2 are dimensionless and ALPHA1 and ALPHA2 are respectively mean and principal wave directions. In terms of Longuet-Higgins Fourier Coefficients R1=(SQRT(a1*a1+b1*b1))/a0, R2=SQRT(a2*a2+b2*b2))/a0, ALPHA1=270.0-ARCTAN(b1,a1), ALPHA2=270.0-(0.5*ARCTAN(b2,a2)+{0. or 180.}), C11(f) is the nondirectional wave spectra data from RECORD C or RECORD K.
CONTINUOUS WIND MEASUREMENT DATA RECORD (RECORD J)
PARAMETERSTARTING POSITIONFIELD LENGTHDESCRIPTION
FILE TYPE 1 3 Always "291"
OBS YEAR/MONTH 4 6 YYYYMM of Observation
RECORD TYPE 10 1 Always 'J'
STATION 11 6 Six character unique name of observation point
REPORT DATE 17 6 YYMMDD (UTC)
REPORT TIME 23 4 HHMM (UTC) - End of met. data acquisition, rounded to beginning of nearest whole minute
SPEED AVERAGING METHOD 27 1 X - 1=VECTOR, 2=SCALER
STANDARD DEVIATION OF HOURLY SPEED 28 3 XXX - m/sec to tenths
STANDARD DEVIATION OF HOURLY DIRECTION 31 4 XXXX - Whole degrees
HOURLY PEAK WIND 35 3 XXX - m/sec to tenths (high- est 5 sec wind)
DIRECTION OF HOURLY PEAK 38 3 XXX - Whole degrees
MINUTE OF HOURLY PEAK 41 2 XX - Minutes
END OF ACQUISITION TIME 43 4 XXXX - HHMM (UTC)
FIRST AVERAGE DIRECTION 47 3 XXX - Whole degrees
FIRST AVERAGE SPEED 50 3 XXX - m/sec to tenths
SECOND AVERAGE DIRECTION 53 3 XXX - Whole degrees
SECOND AVERAGE SPEED 56 3 XXX - m/sec to tenths
THIRD AVERAGE DIRECTION 59 3 XXX - Whole degrees
THIRD AVERAGE SPEED 62 3 XXX - m/sec to tenths
FOURTH AVERAGE DIRECTION 65 3 XXX - Whole degrees
FOURTH AVERAGE SPEED 68 3 XXX - m/sec to tenths
FIFTH AVERAGE DIRECTION 71 3 XXX - Whole degrees
FIFTH AVERAGE SPEED 74 3 XXX - m/sec to tenths
SIXTH AVERAGE DIRECTION 77 3 XXX - Whole degrees
SIXTH AVERAGE SPEED 80 3 XXX - m/sec to tenths
BLANKS 83 38
Ten minute average winds are measured for minutes 0-9, 10-19, 20-29, 30-39, 40-49, and 50-59. The first set is for the ten minute time period ending immediately before the end of acquisition time. The remaining sets go back in time. For example, if the end of acquisition time is 1025, then the first average is 1010 to 1019, the second, 1000 to 1009, etc. If the end of acquisition time is 1030, then the first period will be 1020 to 1029.
EXPANDED RESOLUTION NONDIRECTIONAL WAVE SPECTRA DATA RECORD (RECORD K)
PARAMETERSTARTING POSITIONFIELD LENGTHDESCRIPTION
FILE TYPE 1 3 "291" (constant)
OBS YEAR/MONTH 4 6 YYYYMM of Observation
RECORD TYPE 10 1 Always 'K'
STATION 11 6 Six-character unique name of observation point
OBSERVED DATE 17 6 YYMMDD (UTC)
OBSERVED TIME 23 4 HHMM (UTC) - End of met. data acquisition, rounded to beginning of nearest whole minute
END OF WAVE DATA ACQUISITION 27 4 HHMM (UTC) - Rounded to beginning of nearest whole minute
BLANKS 31 3
COUNT 34 1 X - Number of frequencies on this record
DATA

Up to 5 frequency, resolu- tion, and density fields. Null fields are zero or blank
FREQUENCY 35 4 XXXX- Center frequency of interval in Hertz to ten- thousandths
RESOLUTION 39 4 XXXX - Interval width in Hertz to ten-thousandths
DENSITY 43 9 XXXXXXXXX - Spectral Density, C11, in m2/Hz to hundred thousandths
FREQUENCY 52 4 XXXX - See above
RESOLUTION 56 4 XXXX - See above
DENSITY 60 9 XXXXXXXXX - See above
FREQUENCY 69 4 XXXX - See above
RESOLUTION 73 4 XXXX - See above
DENSITY 77 9 XXXXXXXXX - See above
FREQUENCY 86 4 XXXX - See above
RESOLUTION 90 4 XXXX - See above
DENSITY 94 9 XXXXXXXXX - See above
FREQUENCY 103 4 XXXX - See above
RESOLUTION 107 4 XXXX - See above
DENSITY 111 9 XXXXXXXXX - See above
BLANKS 120 1

EXPANDED RESOLUTION CO AND QUAD SPECTRA FOR DIRECTIONAL WAVES DATA RECORD (RECORD L)
PARAMETERSTARTING POSITIONFIELD LENGTHDESCRIPTION
FILE TYPE 1 3 Always "291"
OBS YEAR/MONTH 4 6 YYYYMM of Observation
RECORD TYPE 10 1 Always 'L'
STATION 11 6 Six character unique name of observation point
OBSERVED DATE 17 6 YYMMDD (UTC)
OBSERVED TIME 23 4 HHMM (UTC) - End of met. data acquisition, rounded to beginning of nearest whole minute
FREQUENCY 27 4 XXXX - Center frequency of interval in Hz to ten- thousandths
RESOLUTION 31 5 XXXXX - Interval width in Hertz to ten-thousandths
CO-SPECTRA C11)** 36 6 XXXXXX - Signed uncorrected spectral density. Decimal assumed to be left of first digit. Subscripts are: 1=Heave, 2=E-W slope, 3=N-S slope
EXPONENT* 42 2 XX - First space is the sign
CO-SPECTRA (C22)** 44 6 XXXXXX - See above
EXPONENT* 50 2 XX - See above
CO-SPECTRA (C33)** 52 6 XXXXXX - See above
EXPONENT* 58 2 XX - See above
CO-SPECTRA (C12)** 60 6 XXXXXX - See above
EXPONENT* 66 2 XX - See above
QUAD-SPECTRA (Q12)** 68 6 XXXXXX - See above
EXPONENT* 74 2 XX - See above
CO-SPECTRA (C13)** 76 6 XXXXXX - See above
EXPONENT* 82 2 XX - See above
QUAD-SPECTRA (Q13)** 84 6 XXXXXX - See above
EXPONENT* 90 2 XX - See above
CO-SPECTRA C23)** 92 6 XXXXXX - See Above
EXPONENT* 98 2 XX - See above
QUAD-SPECTRA (Q23)** 100 6 XXXXXX - See above
EXPONENT* 106 2 XX - See above
SPECTRA (C22-C33)** 108 6 XXXXXX - See Above
EXPONENT* 114 2 XX - See above
SENSOR OUTPUT 116 1 X - 1=Displacement; 2=Acceleration
BLANKS 117 4
* If this exponent is less than -9, the exponent and its associated spectra will be zero. ** For displacement: C11 in m2/Hz, C22 in 1/Hz, C33 in 1/Hz, C12 in m/Hz, C13 in m/Hz, Q12 in m/Hz, Q13 in m/Hz, C23 in 1/Hz, Q23 in 1/Hz. For acceleration: C11, C12, C13, Q12, Q13 in [m/s2]2/Hz, C22, C33, Q23,
COMMENT (RECORD M)
PARAMETERSTARTING POSITIONFIELD LENGTHDESCRIPTION
FILE TYPE 1 3 Always "291"
OBS YEAR/MONTH 4 6 YYYYMM of Observation
RECORD TYPE 10 1 Always "M"
STATION 11 6 Six character unique name of observation point
BLANK 17 1 Always blank
COMMENT 18 103 Free form comments