What term is used for ancillary information that models the internal distribution of a phenomenon?

The term that refers to ancillary information modeling the internal distribution of a phenomenon is dasymetric. Dasymetric mapping is a technique that enhances traditional choropleth maps by using additional data to more accurately represent the spatial distribution of a particular phenomenon within predefined areas, such as census tracts or administrative boundaries. This method allows for a more precise understanding by distinguishing regions with varying densities of the phenomenon, rather than assuming uniformity across those areas.

In the context of spatial analysis and visualization, dasymetric mapping can provide a clearer picture of how a phenomenon is distributed within a given space, thus offering better insight and decision-making capabilities. The technique relies on auxiliary data layers, like land-use information or population density, to refine the representation of the data.

Isopleth mapping involves lines that connect points of equal value, illustrating gradients or continuous phenomena like elevation or temperature. Choropleth mapping displays statistical data by geographic regions but doesn’t typically utilize the additional detail provided by ancillary data as dasymetric mapping does. Geocoding is the process of converting addresses into geographic coordinates, which is a different concept altogether and not related to the internal modeling of phenomena.