Suppose that Dublin city transportation department would like to perform data analysis on motorway traffic for the planning of M50 extension based on the city traffic data collected at different hours every day, for the last five years. 1. Briefly explain what is meant by the term spatial data warehouse. 2. Design a spatial data warehouse that stores the motorway traffic information so that people can easily see the average and peak time traffic flow by motorway, by time of day, by weekdays, and the traffic situation when a major accident occurs. 3. What information can we mine from such a spatial data warehouse to help city planners? 4. This data warehouse contains both spatial and temporal data. Propose one mining technique that can efficiently mine interesting patterns from such a spatio-temporal data warehouse.