zonesUpper

zonesUpper is a term used in various software, data modeling, and GIS contexts to denote the subset of zones classified as the upper tier within a two-tier zoning model. The exact meaning of "upper" depends on the project: it can refer to higher elevation, higher priority, higher security, or a higher administrative level. Because it is not a standardized term, zonesUpper is typically implemented as a variable, field, or dataset key in code and data schemas, often alongside zonesLower or zonesMid.

In practice, zonesUpper is used to filter, query, or apply rules to zones that belong to the upper tier. For example, a mapping application might highlight zonesUpper differently, or a simulation might apply distinct physical properties to them. The data type of zonesUpper is usually a collection or index of identifiers that correspond to specific zones, but it may also be a computed property that groups other zone attributes.

Implementation notes: naming conventions may vary; some projects prefer camelCase as zonesUpper, while others use UpperZones or ZoneUpperList. The concept is portable across domains such as urban planning, ecology, and game design, where zone categorization supports hierarchical rules and rendering.

See also: zonesLower, zonesMid, zone hierarchy, data model.