Heterogeneity: There are differences in the values of individuals in a group.
Spatial heterogeneity: different locations have different properties (attribute values are different); the heterogeneity in spatial heterogeneity considers the relationship between adjacent quantities and has a relationship with the spatial location. Temporal heterogeneity should also take into account the relationship between adjacent quantities
Differences in the degree of dispersion: By measuring the degree of dispersion between the values of random variables, it can reflect the size of the differences among the observed individuals, and the representativeness of the indicators of the distribution center to the values of the observed variables.
In essence, heterogeneity, uneven distribution, and dispersion are all measures of the differences in the values of individuals in a group. Whereas for the fixed term 'spatial heterogeneity', the relationship between adjacent variables is considered.