Editing Surface freshwater availability (section)

== Aggregation Semantics ==
Geographically, surface freshwater availability can be aggregated across multiple spatial scales, from local catchments to regional, national, and global extents. Aggregation involves summing or averaging the index values within defined spatial units to provide comprehensive assessments at broader scales.

Temporally, aggregation may involve averaging or integrating measurements over specified intervals such as daily, monthly, seasonal, or annual periods, depending on monitoring objectives and data resolution. Cross-signal aggregation involves integrating surface freshwater availability with related hydrological and ecological signals to provide multidimensional assessments of water resources and ecosystem health.

These aggregation approaches enable flexible analysis tailored to specific research, management, or policy needs while maintaining consistency within the SIGNAL framework.