1 Explain the difference between attribute data and spatial data and give an example of each. Do we need to input both data to GIS

2 Even when the increasing availability of digital sources l, why might one still consider tracinf from paper sources for a GIS project

3. What is the difference between "spatial entities " andcontinuous fields" ? When we use an entity-based approach and a field based approach. Give examples.

4. Name four disadvantages of raster data structure