MODIS High-Resolution Processing Instructions

Interactive instructions:

• Start SeaDAS.


• Click on Process->MODIS->l2gen,4.


• Select a Level-1B MODIS input file which contains high-resolution data. (Note: this must originate from a Direct Broadcast Level 0 file.)


• Select a GEO file.


• Select one or more output filenames.


• Click on the Processing Options tab.


• Select one of the following Resolutions:
• 1km (1km ocean + averaged 500m/250m)
• 500m (interpolated 1km + 500m + averaged 250m)
• 250m (interpolated 1km/500m + 250m)


• Select one or more of the following for Gaseous transmittance bitmap selector:
• Ozone (Default)
• CO2
• NO2
• H2O


• Select a value for shortest wavelength for aerosol model selection.


• Select a value for longest wavelength for aerosol model selection.


• If you select aerosol mode option "Multi-scattering with 2-band model selection, SWIR corr":
• Select a value for shortest wavelength for SWIR-based NIR Lw correction.
• Select a value for longest wavelength for SWIR-based NIR Lw correction.


• Click on the File Selection tab.


• Click on Select L2 Products.


• You will see that extra high-resolution band wavelengths are available now in the lower section of the Product Selection Widget. Select your desired products and click Okay.


• Continue on as you normally would, modifying whatever other parameters you wish.

Command-mode instructions:

Example:

l2gen,7,ifile='/home/yourname/seadas5.0/A2004356175510.L1B_LAC_sub',geofile='/home/yourname/seadas5.0/A2004356175510.GEO_sub', ofile1='/home/yourname/seadas5.0/A2004356175510.L2_LAC_sub',resolution=250,gas_opt=15,aer_wave_short=748,aer_wave_long=869, aer_swir_short=1240,aer_swir_long=2130, .......

(in this example gas_opt=15=1+2+4+8 meaning Ozone, CO2, NO2, and H20 are selected)

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