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MSl12 uses a Unix environment variable, MSL12_DATA, to locate the top of the directory tree in order to locate the input files associated with each sensor. Sensor data files are located relative to that root directory. The top-level directory associated with each sensor (e.g.,$MSl12_DATA/sensor) contains sensor-specific data files (available below) to provide wavelength information and band-pass-weighted quantities; a sensor_def_l2prod.dat file to specify a default set of Level-2 products, and a default filter specification file named sensor_filter.dat. Within each sensor directory, there are sub-directories to hold Rayleigh tables and Rayleigh-aerosol diffuse transmittance tables. Spectral response functions and bandpass averaged quantities for each sensor are provided here.

The /common directory contains default files that are utilized by the MSl12 code for all processing regardless of sensor. Such files include tha landmask, the ice mask, the bathymetry mask, climatologies, etc.

To run MSl12, the directory tree $MSL12_DATA must be organized as follows:

/seawifs

/cal
/aerosol
/rayleigh

/modisa

/aerosol
/cal
/rayleigh

/czcs


/aerosol
/cal
/rayleigh

/modist


/aerosol
/cal
/rayleigh

/mos


/aerosol
/cal
/rayleigh

/octs


/aerosol
/rayleigh

/polder


/aerosol
/rayleigh

/osmi


/cal
/rayleigh
/transmittance

/common




Sensor Data Files

Sensor Band-Pass Information (msl12_sensor_info.dat)

MSl12 makes use of external data files containing band-averaged quantities specific to the individual sensor response functions. The sensor files also provide a convenient place to store the nominal band center wavelengths. The standard sensor files used by MSL12 are listed below.

  • SeaWiFS
  • MODIS Aqua
  • MOS
  • OCTS
  • Polder
  • OSMI
  • CZCS

    MSL12 Default Parameter File (msl12_defaults.par)

    Each sensor which MSl12 supports has a predefined set of standard parameters. These parameters are provided in the msl12_defaults.par files, as listed below. MSl12 always reads the defaults file first, to initialize the processing. Any parameters specified on the commandline, either directly or via a user supplied parameter file, will over-ride the values specified in msl12_defaults.par.

  • SeaWiFS
  • MODIS Aqua
  • MOS
  • OCTS
  • Polder
  • OSMI
  • CZCS

    Filter Description File (msl12_filter.dat)

    MSl12 has the ability to apply certain smoothing and flag dilation filters. Each sensor can be provided with a default msl12_filter.dat file which controls the filters to be applied. more to come

  • SeaWiFS
  • MODIS Aqua
  • MOS
  • OCTS
  • Polder
  • OSMI
  • CZCS


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    Updated: 13 July 2005     		NASA logo