Discrete Global Grid
(DGG) A grid consisting of a set of regions that form a partition of the Earth's surface, such that each region has a single point contained in the region associated with it. Each region or point is a cell.
Applications often use DGGs with cell regions that are irregular in shape or size (e.g., division of Earth's surface by water and land mass). But for many purposes, such as algorithmic computations and examination of patterns, DGGs need to be defined by cells with highly regular regions and evenly distributed points. These latter DGGs are called regular DGGs. The most commonly used regular DGGs are based on geographic (latitude-longitude) coordinates.