The OPAC ftp distribution:


Version

This is Version 3.1a of OPAC. It is the first official release. Further information can be found here:

Download

OPAC is available on the anonymous ftp server of our computer center.

Feedback

We don't get funding for this project any longer and thus we can't spend much time for it. But we appreciate any hints about problems with the data set or suggestions for its improvement, and we will try to discuss and include them in future versions. Please feel free to send us an email.

Hardware requirements

OPAC consists of ASCII files, which contain the optical properties of cloud and aerosol components, and of a FORTRAN program, which allows to handle the data. The FORTRAN program was tested to compile and run under DOS (Microsoft Fortran 5.0), Linux (GNU f2c converter), DEC Ultrix, HP Unix, and SunOS.

The whole package requires about 3.5 MB storage capacity.

Installation

To install OPAC, please extract the archive in an empty directory:

> gzip -d opac31a.tar.gz
> tar -xvf opac31a.tar

This will create 2 subdirectories and copy all files in their appropriate places. The tar and gzip programs are also available for DOS (e.g. here).

If you did already install the Global Aerosol Data Set (GADS), you should install OPAC in the same directory, since GADS and OPAC use the same set of optical data of aerosol components, which are stored in the subdirectory optdat.

Now the FORTRAN program has to be compiled. On most UNIX computers, this requires something like:

> f77 opac.f -o opac

In this case, opac will be the name of the executable file. Some compilers give warning errors, which may be ignored.

If you want to use a DOS computer, you must comment out lines 505-507 instead of 501-503 in opac.f. The "\" character is not understood by all compilers.

The following files belong to OPAC: