Regride

Regride is a verb describing the act of applying, creating, or reapplying a grid to a surface or dataset. In geographic information systems, numerical modeling, and related fields, to regride means to organize data into a grid structure again, often by mapping values from an existing grid onto a new one.

In practice, regride is largely synonymous with regrid, regridding, or remeshing; however, it is less common in formal technical writing. When used, it may describe resampling or remeshing to achieve alignment with a standardized or desired grid, sometimes with attention to properties such as conservation or accuracy of represented quantities.

Applications for regride include geographic information systems, image processing, climate and weather modeling, and computational fluid dynamics, where data on one grid must be transformed to another grid. Common methods involve interpolation, aggregation, and conservative remapping to preserve totals or other invariants, depending on the physical meaning of the data being transformed.

Notes and context: the term can refer to grid generation on surfaces such as terrain, or to grid-based representations in simulations. The choice of method influences accuracy, error characteristics, and conservation properties. Because regride is less widely used than related terms like regrid or regridding, software documentation and scholarly work may prefer those variants, even when the underlying concept is the same. See also regrid, regridding, remeshing, interpolation, and resampling.