Every DIRSIG simulation requires an Atmospheric Database File to be created so that the model can correctly predict the path transmissions and path radiances within the scene.
The name of Atmospheric Database File is supplied to the model via the ADB_FILENAME variable in the SCENE section of the Input Configuration File. This file is created using the make_adb program which is included in the DIRSIG distribution. This program determines the specific runs of MODTRAN that will need to be performed to make the needed transmission and radiance tables for the described simulation.
To create the ADB for your specific Input Configuration File (in this case, mySim.cfg), run the following command:
prompt> make_adb mySim.cfg
The Atmospheric Database File is unique for each combination of date, time, sensor position, sensor viewing geometry, sensor response, etc. If any of these aspects change, the Atmospheric Database File will need to be regenerated for the new configuration.