👉 In geographic information systems (GIS), a "geotactic" is a type of coordinate system used in mapping. It is characterized by having a grid that extends from one to three dimensions, with each dimension representing a specific geographic feature such as a land area or a water body. Geotactics are often used in cartography and map projections, where they provide a standardized representation of the Earth's surface for various applications. They are commonly used in conjunction with other coordinate systems, such as Mercator