GTECH 709 Georelational Principle Organization of shapefiles Data types Geographic v. map data Classification methods

Data Types Experience with lab 3 suggests a revisit: Organization of a shapefile Geographic data versus map representation Points, lines, areas in geographic data Points, lines, areas visualized in a graphic/map Two types of attributes Attributes of the geographic feature Attributes of the map element

Data Types Numeric (Int, Real) Text Date Boolean (Coordinate) (Point, Line, Polygon)

Classification Scales Nominal, categorical, ordinal, interval, ratio Single symbol, categorical, graduated None, discrete, continuous

Classification Methods Equal interval Quantile Standard deviation Natural breaks Manual