A grid where neighbor grid points can be addressed by offsets (in 2 or 3 Cartesian dimensions). Typical examples are the lat-lon grid of COSMO or the cubed-sphere of FV3.
Describes a set of grid points on which the computation is applied. It doesn't contain grid points in the halo of a computation.
Compute domain extended by halo points where intermediate result are computed in a staged computation.
A weather and climate model developed by DWD and MPI-M build on a icosahedral grid. ICON uses an unstructured, but the grid can also be represented as partially structured, see Pentagon problem.
TODO disambiguate from compute domain or make it an alias.
An array located on a grid point with one entry per neighbor location.
In the ICON grid, the sphere is built from rhomboids. Within each rhomboid the mesh and dual-mesh are fully structured (triangles, each vertex has exactly 6 edges). At corner points where the rhomboids are patched together, each vertex has only 5 neighbors. TODO add picture.
In the context of unstructured grids, a sparse field, is a field defined on the neighbors of each grid point. The restriction of a sparse field to a single grid point is a local field. The name originates from the sparse nature of the incidence matrix mapping the primary location to the secondary / neighbor location.
A grid where the connectivity follows a regular pattern that allows strided access to neighbors. Examples of structured grids are Cartesian grids or the structured representations of the ICON grid.
A grid without any assumptions on regularity of the connectivity. Note: any structured grid can be described by an unstructured grid.
Tools like GT4Py generate stencils from DSL. The language in which they are generated (typically C++, CUDA) is called the computation language. This can also be a higher level language sometimes for debugging purposes. The Framework can but does not have to be mentioned when naming the computation language (for example "GridTools/C++", but not "GridTools" - that would be ambiguous).
Code generation tools may also generate bindings and / or wrappers for using the stencils from an other (typically higher level) language. This is referred to as the tool "supporting language bindings for language X". The corresponding languages are "Languages with bindings support" or "bindings languages" for short.