I saw some folks talking about "faceting" in relation to a map data display, what does this mean in general terms? Examples?
One concept of 'faceting' is to display data in separated maps (known as panels), so to emphasize groups or subgroups of data.
For example, each panel can represent a timestamp (commonly used to represent historical climate data). Here is one example from New Zealand's National Institute of Water and Atmospheric Research.
First time I came across 'faceting' was with R package
ggplot2. For instance, see Overlaying a polyshape to faceted maps in R with ggplot? (more examples can be found in Google, link).