Common and native regions

Common regions

In model-comparison projects, it is useful to define common regions that can be computed consistently from original model results.

A widely used example are the R5, R9 and R10 regions.

Native model regions

In contrast to common regions used for comparison of scenarios across models, each model has a native region resolution.

Models with a coarse spatial resolution should add a model-specific identifier to the native model regions (e.g., MESSAGEix-GLOBIOM 1.1|North America) to avoid confusion when comparing results to other models with similar-but-different regions.

If a model has a country-level resolution (where disambiguation is not a concern), we recommend to not add a model identifier. Instead, use the naming convention following the common list of countries (see A common list of country names).