What is a RegionGrid?

A RegionGrid contains information that:

• Allows us to extract gridded lon-lat data for a given GeoRegion (see GeoRegions.jl) of interest.

• Subset the relevant longitude/latitude vectors from the initial grid.

• Allows for easy spatial-averaging of extracted gridded lon-lat data, weighted by latitude.

The Types of RegionGrids

The RegionGrid abstract type has three subtypes:

1. RectilinearGrid type, which is for the extraction of data on rectilinear lon-lat grids

2. GeneralizedGrid type, which is for the extraction of data on non-rectilinear lon-lat grids, such as a curvilinear grid.

3. UnstructuredGrid type, which is for the extraction of data on unstructured lon-lat grids such as a cubed-spherical grid, or an unstructured mesh.

Confusing? Fret not, it's always easier to understand by doing, so let's go through an example here.