Discrete Global Grids
Discrete Global Grids (DGGs) offer an alternative to traditional coordinate grids like latitude-longitude systems for spatial data representation. DGGs divide the Earth's surface into non-overlapping cells that are uniform in design and that cover the whole earth. These grids are usually based on polyhedral projections, such as icosahedral or octahedral, which result in cells of equal area, allowing for more accurate data analysis in global-scale applications. Still, both systems have their strengths and weaknesses, with DGGs excelling in precision and uniformity, and traditional grids simply being easier to use and more accessible.
The big advantage of DGGs is the fact that they are uniform. Since DGG cells are of equal size, they avoid the distortions seen in coordinate systems like latitude-longitude, where cells near the poles are compressed and smaller (Lei et al., 2020). This uniformity makes DGGs particularly beneficial in geospatial analysis and modeling, where equal-area representation is helpful for avoiding measurement biases like population density or climate data (Petrov, 2023). DGGs are also often hierarchical, i.e., they can represent data at multiple resolutions and are flexible for both local and global analysis.
However, DGGs also have drawbacks. One disadvantage is the complexity of implementation. Unlike the familiar coordinate grids, DGG systems require specialized algorithms and data structures to manage the polyhedral geometries, which can introduce computational bottleneck and make them less intuitive for those accustomed to traditional coordinate grids (Liu, 2023). Plus, DGGs are relatively new and less standardized, so there can be compatibility issues with existing geographic information systems (GIS) software.
In contrast, coordinate grids like the latitude-longitude system are widely used, are well-understood, and supported by virtually all geospatial tools. That is their main advantage. They allow for straightforward mapping. They are easy to integrate with existing data sources, too. Still, their unequal cell sizes and distortions make them less accurate for certain types of global data analysis, like when uniformity in spatial representation is required, and this is their main disadvantage.
References
Lei, K., Qi, D., & Tian, X. (2020). A new coordinate system for constructing spherical grid
systems.Applied Sciences,10(2), 655.
Liu, H. T. D. (2023).Algorithms for Data-Driven Geometric Stylization &
Acceleration(Doctoral dissertation, University of Toronto (Canada)).
Petrov, P. (2023). Practical approach for modifying existing geocoding system from equal
angular to equal area.Economics and computer science, (2), 43-65.
