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g_radbr.for
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REAL FUNCTION BRIGHT_M(W, R)
c-----------------------------------------------------------------------
c!F77
c
c!DESCRIPTION:
c Compute brightness temperature given monochromatic Planck radiance
c (Radiance units: Watts per square meter per steradian per micron)
c
c!INPUT PARAMETERS:
c W (REAL) Wavelength (microns)
c R (REAL) Monochromatic Planck radiance (Watts per
c square meter per steradian per micron)
c
c!OUTPUT PARAMETERS:
c BRIGHT_M (REAL) Brightness temperature (Kelvin)
c
c!REVISION HISTORY:
c
c!TEAM-UNIQUE HEADER:
c Liam.Gumley@ssec.wisc.edu
c
c!END
c-----------------------------------------------------------------------
IMPLICIT NONE
c ... Include files
!include 'fundamental_constants.inc'
C-----------------------------------------------------------------------
C !F77-INC
C
C !DESCRIPTION:
C Fundamental constants for Planck functions.
C
C !INPUT PARAMETERS:
C None
C
C !OUTPUT PARAMETERS:
C None
C
C !REVISION HISTORY:
C
C !TEAM-UNIQUE HEADER:
C Developed by the MODIS Group, CIMSS/SSEC, UW-Madison.
C
C !END
C-----------------------------------------------------------------------
c Fundamental constants required for the monochromatic
c Planck function routines PLANCK_M, PLANC_M, BRIGHT_M, BRITE_M
c
c Taken from the NIST Reference on Constants, Units, and Uncertainty
c
c http://physics.nist.gov/cuu/Constants/
c
c See also:
c
c Mohr, P.J. and B.N. Taylor, "CODATA recommended values of the
c fundamental physical constants: 1998", Reviews of Modern Physics,
c Vol.72, No.2, 2000.
c ... Planck constant (Joule second)
double precision h
parameter (h = 6.62606876d-34)
c ... Speed of light in vacuum (meters per second)
double precision c
parameter (c = 2.99792458d+08)
c ... Boltzmann constant (Joules per Kelvin)
double precision k
parameter (k = 1.3806503d-23)
c ... Derived constants
double precision c1, c2
parameter (c1 = 2.0d+0 * h * c * c)
parameter (c2 = (h * c) / k)
c .............................................
c ... Arguments
real w, r
c ... Local variables
double precision ws
c ... Set default return value
bright_m = -1.0
c ... Check input parameters and return if they are bad
if (w .le. 0.0 .or. r .le. 0.0) return
c ... Convert wavelength to meters
ws = 1.0d-6 * dble(w)
c ... Compute brightness temperature
bright_m = sngl(c2 /
& (ws * log(c1 / (1.0d+6 * dble(r) * ws**5) + 1.0d+0)))
END
REAL FUNCTION BRITE_M(V, R)
c-----------------------------------------------------------------------
c!F77
c
c!DESCRIPTION:
c Compute brightness temperature given monochromatic Planck radiance
c (Radiance units: milliWatts per square meter per steradian per
c inverse centimeter)
c
c!INPUT PARAMETERS:
c V (REAL) Wavenumber (inverse centimeters)
c R (REAL) Monochromatic Planck radiance (milliWatts per
c square meter per steradian per
c inverse centimeter)
c
c!OUTPUT PARAMETERS:
c BRITE_M (REAL) Brightness temperature (Kelvin)
c
c!REVISION HISTORY:
c
c!TEAM-UNIQUE HEADER:
c Liam.Gumley@ssec.wisc.edu
c
c!END
c-----------------------------------------------------------------------
IMPLICIT NONE
c ... Include files
!include 'fundamental_constants.inc'
C-----------------------------------------------------------------------
C !F77-INC
C
C !DESCRIPTION:
C Fundamental constants for Planck functions.
C
C !INPUT PARAMETERS:
C None
C
C !OUTPUT PARAMETERS:
C None
C
C !REVISION HISTORY:
C
C !TEAM-UNIQUE HEADER:
C Developed by the MODIS Group, CIMSS/SSEC, UW-Madison.
C
C !END
C-----------------------------------------------------------------------
c Fundamental constants required for the monochromatic
c Planck function routines PLANCK_M, PLANC_M, BRIGHT_M, BRITE_M
c
c Taken from the NIST Reference on Constants, Units, and Uncertainty
c
c http://physics.nist.gov/cuu/Constants/
c
c See also:
c
c Mohr, P.J. and B.N. Taylor, "CODATA recommended values of the
c fundamental physical constants: 1998", Reviews of Modern Physics,
c Vol.72, No.2, 2000.
c ... Planck constant (Joule second)
double precision h
parameter (h = 6.62606876d-34)
c ... Speed of light in vacuum (meters per second)
double precision c
parameter (c = 2.99792458d+08)
c ... Boltzmann constant (Joules per Kelvin)
double precision k
parameter (k = 1.3806503d-23)
c ... Derived constants
double precision c1, c2
parameter (c1 = 2.0d+0 * h * c * c)
parameter (c2 = (h * c) / k)
c .............................................
c ... Arguments
real v, r
c ... Local variables
double precision vs
c ... Set default return value
brite_m = -1.0
c ... Check input parameters and return if they are bad
if (v .le. 0.0 .or. r .le. 0.0) return
c ... Convert wavenumber to inverse meters
vs = 1.0d+2 * dble(v)
c ... Compute brightness temperature
brite_m = sngl(c2 *
& vs / log(c1 * vs**3 / (1.0d-5 * dble(r)) + 1.0d+0))
END
REAL FUNCTION MODIS_BRIGHT(RAD, BAND, UNITS)
C-----------------------------------------------------------------------
C!F77
C
C!DESCRIPTION:
C Compute brightness temperature for a MODIS infrared band
C on Terra or Aqua.
C
C Spectral responses for each IR detector were obtained from MCST:
C ftp://ftp.mcst.ssai.biz/pub/permanent/MCST in directories
C PFM_L1B_LUT_4-30-99 (Terra) and FM1_RSR_LUT_07-10-01 (Aqua).
C
C An average spectral response for all detectors in each band was
C computed. The detector-averaged spectral response data were used
C to compute the effective central wavenumbers and temperature
C correction coefficients included in this module.
C
C NOTE: The plaform name ('Terra' or 'Aqua') is passed to this
C function via the common block defined in 'platform_name.inc'.
C
C!INPUT PARAMETERS:
C RAD (REAL) Planck radiance (units are determined by UNITS)
C BAND (LONG) MODIS IR band number (20-25, 27-36)
C UNITS (LONG) Flag defining radiance units
C 0 => milliWatts per square meter per
C steradian per inverse centimeter
C 1 => Watts per square meter per
C steradian per micron
C
C!OUTPUT PARAMETERS:
C MODIS_BRIGHT Brightness temperature (Kelvin)
C Note that a value of -1.0 is returned if
C RAD .LE. 0.0, or BAND is not in range 20-25, 27-36.
C
C!REVISION HISTORY:
C Liam.Gumley@ssec.wisc.edu
C
C!TEAM-UNIQUE HEADER:
C Developed by the MODIS Group, CIMSS/SSEC, UW-Madison.
C
C!END
C-----------------------------------------------------------------------
IMPLICIT NONE
c ... Include files
!include 'platform_name.inc'
C-----------------------------------------------------------------------
C !F77-INC
C
C !DESCRIPTION:
C Include file for UW MODIS Algorithm Platform Name
C
C !INPUT PARAMETERS:
C None
C
C !OUTPUT PARAMETERS:
C None
C
C !REVISION HISTORY:
C
C !TEAM-UNIQUE HEADER:
C Developed by the MODIS Group, CIMSS/SSEC, UW-Madison.
C
C !END
C-----------------------------------------------------------------------
character*5 platform_name
common / platform_name_common / platform_name
c ...................................................
c ... Arguments
real rad
integer band, units
c ... Local variables
real cwn_terra(16), tcs_terra(16), tci_terra(16)
real cwn_aqua(16), tcs_aqua(16), tci_aqua(16)
real cwn, tcs, tci
integer index
c ... External functions
real bright_m, brite_m
external bright_m, brite_m
c ... Data statements
c-----------------------------------------------------------------------
c TERRA MODIS DETECTOR-AVERAGED SPECTRAL RESPONSE
c (LIAM GUMLEY 2003/06/05)
c BAND 20 TEMPERATURE RANGE WAS 180.00 K TO 350.00 K
c BAND 21 TEMPERATURE RANGE WAS 180.00 K TO 400.00 K
c BAND 22 TEMPERATURE RANGE WAS 180.00 K TO 350.00 K
c BAND 23 TEMPERATURE RANGE WAS 180.00 K TO 350.00 K
c BAND 24 TEMPERATURE RANGE WAS 180.00 K TO 320.00 K
c BAND 25 TEMPERATURE RANGE WAS 180.00 K TO 320.00 K
c BAND 27 TEMPERATURE RANGE WAS 180.00 K TO 320.00 K
c BAND 28 TEMPERATURE RANGE WAS 180.00 K TO 320.00 K
c BAND 29 TEMPERATURE RANGE WAS 180.00 K TO 340.00 K
c BAND 30 TEMPERATURE RANGE WAS 180.00 K TO 340.00 K
c BAND 31 TEMPERATURE RANGE WAS 180.00 K TO 340.00 K
c BAND 32 TEMPERATURE RANGE WAS 180.00 K TO 340.00 K
c BAND 33 TEMPERATURE RANGE WAS 180.00 K TO 330.00 K
c BAND 34 TEMPERATURE RANGE WAS 180.00 K TO 320.00 K
c BAND 35 TEMPERATURE RANGE WAS 180.00 K TO 310.00 K
c BAND 36 TEMPERATURE RANGE WAS 180.00 K TO 310.00 K
c BANDS
c 20, 21, 22, 23,
c 24, 25, 27, 28,
c 29, 30, 31, 32,
c 33, 34, 35, 36,
c ... Effective central wavenumbers (inverse centimeters)
data cwn_terra/
& 2.641767E+03, 2.505274E+03, 2.518031E+03, 2.465422E+03,
& 2.235812E+03, 2.200345E+03, 1.478026E+03, 1.362741E+03,
& 1.173198E+03, 1.027703E+03, 9.081998E+02, 8.315149E+02,
& 7.483224E+02, 7.309089E+02, 7.188677E+02, 7.045309E+02/
c ... Temperature correction slopes (no units)
data tcs_terra/
& 9.993487E-01, 9.998699E-01, 9.998604E-01, 9.998701E-01,
& 9.998825E-01, 9.998849E-01, 9.994942E-01, 9.994937E-01,
& 9.995643E-01, 9.997499E-01, 9.995880E-01, 9.997388E-01,
& 9.999192E-01, 9.999171E-01, 9.999174E-01, 9.999264E-01/
c ... Temperature correction intercepts (Kelvin)
data tci_terra/
& 4.744530E-01, 9.091094E-02, 9.694298E-02, 8.856134E-02,
& 7.287017E-02, 7.037161E-02, 2.177889E-01, 2.037728E-01,
& 1.559624E-01, 7.989879E-02, 1.176660E-01, 6.856633E-02,
& 1.903625E-02, 1.902709E-02, 1.859296E-02, 1.619453E-02/
c-----------------------------------------------------------------------
c AQUA MODIS DETECTOR-AVERAGED SPECTRAL RESPONSE
c (LIAM GUMLEY 2003/06/05)
c BAND 20 TEMPERATURE RANGE WAS 180.00 K TO 350.00 K
c BAND 21 TEMPERATURE RANGE WAS 180.00 K TO 400.00 K
c BAND 22 TEMPERATURE RANGE WAS 180.00 K TO 350.00 K
c BAND 23 TEMPERATURE RANGE WAS 180.00 K TO 350.00 K
c BAND 24 TEMPERATURE RANGE WAS 180.00 K TO 320.00 K
c BAND 25 TEMPERATURE RANGE WAS 180.00 K TO 320.00 K
c BAND 27 TEMPERATURE RANGE WAS 180.00 K TO 320.00 K
c BAND 28 TEMPERATURE RANGE WAS 180.00 K TO 320.00 K
c BAND 29 TEMPERATURE RANGE WAS 180.00 K TO 340.00 K
c BAND 30 TEMPERATURE RANGE WAS 180.00 K TO 340.00 K
c BAND 31 TEMPERATURE RANGE WAS 180.00 K TO 340.00 K
c BAND 32 TEMPERATURE RANGE WAS 180.00 K TO 340.00 K
c BAND 33 TEMPERATURE RANGE WAS 180.00 K TO 330.00 K
c BAND 34 TEMPERATURE RANGE WAS 180.00 K TO 320.00 K
c BAND 35 TEMPERATURE RANGE WAS 180.00 K TO 310.00 K
c BAND 36 TEMPERATURE RANGE WAS 180.00 K TO 310.00 K
c BANDS
c 20, 21, 22, 23,
c 24, 25, 27, 28,
c 29, 30, 31, 32,
c 33, 34, 35, 36,
c ... Effective central wavenumbers (inverse centimeters)
data cwn_aqua/
& 2.647418E+03, 2.511763E+03, 2.517910E+03, 2.462446E+03,
& 2.248296E+03, 2.209550E+03, 1.474292E+03, 1.361638E+03,
& 1.169637E+03, 1.028715E+03, 9.076808E+02, 8.308397E+02,
& 7.482977E+02, 7.307761E+02, 7.182089E+02, 7.035020E+02/
c ... Temperature correction slopes (no units)
data tcs_aqua/
& 9.993438E-01, 9.998680E-01, 9.998649E-01, 9.998729E-01,
& 9.998738E-01, 9.998774E-01, 9.995732E-01, 9.994894E-01,
& 9.995439E-01, 9.997496E-01, 9.995483E-01, 9.997404E-01,
& 9.999194E-01, 9.999071E-01, 9.999176E-01, 9.999211E-01/
c ... Temperature correction intercepts (Kelvin)
data tci_aqua/
& 4.792821E-01, 9.260598E-02, 9.387793E-02, 8.659482E-02,
& 7.854801E-02, 7.521532E-02, 1.833035E-01, 2.053504E-01,
& 1.628724E-01, 8.003410E-02, 1.290129E-01, 6.810679E-02,
& 1.895925E-02, 2.128960E-02, 1.857071E-02, 1.733782E-02/
c-----------------------------------------------------------------------
c ... Set default return value
modis_bright = -1.0
c ... Check input parameters and return if they are bad
if (rad .le. 0.0 .or.
& band .lt. 20 .or.
& band .gt. 36 .or.
& band .eq. 26) return
c ... Get index into coefficient arrays
if (band .le. 25) then
index = band - 19
else
index = band - 20
endif
c ... Get the coefficients for Terra or Aqua
if (platform_name(1:5) .eq. 'Terra' .or.
& platform_name(1:5) .eq. 'terra' .or.
& platform_name(1:5) .eq. 'TERRA') then
cwn = cwn_terra(index)
tcs = tcs_terra(index)
tci = tci_terra(index)
else if (platform_name(1:4) .eq. 'Aqua' .or.
& platform_name(1:4) .eq. 'aqua' .or.
& platform_name(1:4) .eq. 'AQUA') then
cwn = cwn_aqua(index)
tcs = tcs_aqua(index)
tci = tci_aqua(index)
else
CONTINUE
endif
c ... Compute brightness temperature
if (units .eq. 1) then
c ... Radiance units are
c ... Watts per square meter per steradian per micron
modis_bright = (bright_m(1.0e+4 / cwn, rad) - tci) / tcs
else
c ... Radiance units are
c ... milliWatts per square meter per steradian per wavenumber
modis_bright = (brite_m(cwn, rad) - tci) / tcs
endif
END