Fig. 4
From: Spatial and temporal resolution of geographic information: an observation-based theory
Some examples of observation collections. Note: Each point on the figure represents the spatial location of a single observation, the dotted box in black represents the spatial extent of the study area for which the observations have been generated. a shows two collections with different amount of spatial detail, but similar total spacing; b shows two collections with distinct amount of spatial detail, but similar mean spacing. The observed study area (i.e., the portion of the study area that has been observed) reflects differences in amount of spatial detail where both total- and mean spacing fail