OPAC configuration
The OPAC configuration allows users to update the basic information of the OPAC aerosol database and modify the default values of its key input variables. The user can introduce/modify the default values of:
- The OPAC version number (e.g., 3.1 for OPAC v3.1) by filling the Version text box. This information is not currently needed to run OPAC.
- The path and name for the OPAC source file by filling the corresponding text box. This can be done by typing the path and name of the OPAC executable (e.g., C:\Program Files (x86)\OPAC\opac31\opac.exe) or by pressing on the
… button and select the executable file.

In addition, the user can see and modify the values of the key input variables used by the OPAC software. These variables are grouped in the groups of Main param. and Particle types, both accessed through the pop-up menu.
All the key input OPAC variables are described with the following set of attributes:
- Name: String with a short name identifying the parameter.*
- Description: String with a brief description of the parameter.
- Datatype: String defining the data type (STRING, INTEGER or FLOAT) associated with the parameter.
- Paramtype: String defining the type of parameter: discrete (parameter can only take values e.g. 1, 2 and 3) or continuous (parameter can take any value between e.g. 1 and 3).*
- Static: Attribute defining whether the parameter is static (1) or dynamic (0). Static refers to parameters that do not vary within a LUT while dynamic refers to parameters that vary within a LUT.
- Default: Default value assigned to the parameter.*
- Values: For discrete parameters, this attribute defines the possible set of values that can be selected. For continuous parameters, values contain the minimum and maximum values that can be assigned.*
- Options: Set of strings defining the discrete values. Only valid for discrete parameters such as aerosol model or solar irradiance spectra.*
- Units: String defining the units of the parameter. Empty attribute means dimensionless or not applicable.*
- Visibility: Attribute defining the access of a given variable for a Basic, Medium or Advance user.
* Do not change these values!
The user can remove one or more of these parameters by activating their tick box
and pressing the button
at the bottom-right corner. In addition, users can
eventually add new OPAC key input parameters by pressing the
button. This will add an empty row on the table, where the user should then assign the corresponding attributes to the added parameter.
However, this functionality is not yet implemented.
To apply the changes, click on the Apply or Apply and Close buttons. This will update the RTM configuration file (OPACconf.xml) stored
in the ALG Conf subfolder. Notice that these changes (e.g., deleted parameters, change on the default attribute values) cannot be undone.