modis_bright - converts radiance units to brightness temperatures for MODIS channels 20 through 36 (17 emissive bands).

This function requires a TeraScan MODIS license.

SYNOPSIS

modis_bright  [ inputfile outputfile ]
modis_bright  [ inputfile ... directory ]

There are no parameters.

DESCRIPTION

modis_bright computes black body temperatures from calibrated MODIS radiance data sets by inverting Planck's function. The resulting output datasets contain brightness temperatures in Celsius. Input modis radiance data is expected to be in units of Watts per square meter per steradian per micron . Radiance values can be generated from calibrated HDF files using the script MODIS_RADIANCE.

modis_bright uses the effective central wavenumbers for the MODIS IR bands which are supplied by the NASA MODIS calibration team. Additional temperature corrections are performed using slopes and intercepts (see NOTES).

EXAMPLES

scrum% modis_bright
in/out files   : char(255) ? t1.00306.1557.RADIANCE_tdf t1.00306.1557.bright

Processing:t1.00306.1557.RADIANCE_tdf: Lines: 1000 Samples: 1354
Line    0
Line  100
Line  200
Line  300
Line  400
Line  500
Line  600
Line  700
Line  800
Line  900
Line 1000
modis_bright: Finished Calibration, closing files...

FILES

$SATDATA/terra-1/modcentral.tdf, $SATDATA/terra-1/tci.tdf, $SATDATA/tcs.tdf

SEE ALSO

MODIS_RADIANCE

NOTES

modis_bright uses the following datasets in $SATDATA/terra-1:

• modcentral.tdf - MODIS central wavenembers for IR bands
• tci.tdf - temperature correction intercepts
• tcs.tdf - temperature correction slopes

REFERENCES

Spectral responses for each IR detector obtained from SSEC, University of Wisconsin, Madison. Files originated at NASA ftp://mcstftp.gsfc.nasa.gov/pub/permanent/MCST/PFM_L1B_LUT_4-30-99

Last Update: $Date: 2002/04/19 19:50:36 $