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

2. 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

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

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

5. Classification Methods
Equal interval
Quantile
Standard deviation
Natural breaks
Manual