GEOG 170 Study Guide - Midterm Guide: Spatiotemporal Database, Contour Line
Document Summary
O both have continuous surfaces: isoline maps connect points of equal values to create areas (similar to contour lines, they have the same value). Examples are annual precipitation maps of a region: isopleth maps looks very similar, but show density or rate surfaces (represent an average). Example is population density, which cannot exist at a point: dasymetric and choropleth maps boundaries such as county lines or state borders, choropleth variables can be normalized" based on area. They use political: dasymetric maps do not use political boundaries, rather physical attributions, display movement of an object or variable, time composite maps. Show multiple time points on a single map: temporal re-expression, common way to display spatio-temporal data sequentially, allows the variable to be viewed in temporal breakdowns. Example is a map showing locations of alcohol related incidences on the. Goal is to identify areas inside and outside of a threshold.
