Slide 17 of 29
This is May Yuan’s typology. I find her writing on this subject unclear myself. These are the types of query we want to do, and the type of meaning we want to capture.
“I. For a given site where occurrences and duration of events or attributes may change from time to time, analysis is done by fixing location, controlling attribute, and measuring time” etcetera
“Type I … can be totally handled ... as historical transactions in a ... dbs. Type II categorical coverages describe static spatial distribution ..., such as topography or air pressure. ... current GIS store this …[in] vector or raster layers. …comparisons are made between two ... sites according to data of the same vintage. III (choropleth) concern variations of a geographic phenomenon at a snapshot, whereas IV compare states of an event ... at different sites. See Frank et al, Int.J.Geog.Inf.Sys. 11 (3) 215-232 for proper destinctions.
Two types of temporal changes ... a thunderstorm may develop (V) in a county and progress (VI) to others ..., a comparison of frequency, period, and severity of an event in an area.
Temporal GIS should support both location-based analysis (III and IV), such as landuse changes and ecological succession, and process-based chang es (V and VI), for example fire spread and storm development.
