|Examples of scales in geography and metereology|
|Micro||1 m – 1 km||1 m2 – 1 km2||local|
|Meso||1 km - 100 km||1 km2 - 10,000 km2||regional|
|Macro||100 km - 10,000 km||10,000 km2 - 100,000,000 km2||continental|
|Mega||> 10,000 km||> 100,000,000 km2||global|
In sciences such as physics, geography, astronomy, meteorology and statistics, the term scale or spatial scale is used for describing or classifying with large approximation the extent or size of a length, distance, or area studied or described. For instance, in physics an object or phenomenon can be called microscopic if too small to be visible. In climatology, a micro-climate is a climate which might occur in a mountain, valley, or near a lake shore, whereas in statistics a megatrend is a political, social, economical, environmental, or technological trend which involves the whole planet or is supposed to last a very large amount of time.
In physics, the concept of scale is closely related to the more accurate concept of order of magnitude.
These divisions are somewhat arbitrary; where, on this table, mega- is assigned global scope, it may only apply continentally or even regionally in other contexts. The interpretations of meso- and macro- must then be adjusted accordingly.