1. Generalisation is necessary because it simplifies the map. Makes it easier to produce.

2. Maps get more generalised the higher the scale.

3. As scale decreases the features get less details.

4. Simplification features have three dimensions such as length, width, and height. Elements that remain depends on the purpose of the map. And it loses the third dimension.

Selection elements remaining depends on the purpose of the map, and the scale of the map. Higher scale results in fewer details and features.

5.The three types of data classificationa are: Nominal, Ordinal and Interval.