absolute path

The full path to a file, e.g., /example/foo/bar.txt. An absolute path should always start with /. As opposed to a relative path.


See compile.

build directory

A directory where build configuration settings are stored, and where intermediate build files like object files, module files, and libraries are stored.

checkpoint file

See restart file.


Generating an executable program from source code (which is in a plain-text format).

gridded component

A formal model component. MAPL organizes model components with a tree structure, and facilitates component interconnections.


The MAPL gridded component that handles model output. All GCHP output diagnostics are facilitated by HISTORY.

relative path

The path to a file relative to the current working directory. For example, the relative path to /example/foo/bar.txt if your current working directory is /example is foo/bar.txt. As opposed to an absolute path.

restart file

A NetCDF file with initial conditions for a simulation. Also called a checkpoint file in GCHP.

run directory

The working directory for a GEOS-Chem simulation. A run directory houses the simulation’s configuration files, the output directory (OutputDir), and input files/links such as restart files or input data directories.


A cubed-sphere grid that is “stretched” to enhance the grid resolution in a region.

target face

The face of a stretched-grid that is refined. The target face is centered on the target point.