Question: A virtual layer is
Answer: A layer that is dynamically generated from one or more other layers.

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Question: 2. What do you think this virtual layer will do when based on our trees example
Answer: Creates a virtual layer where the geometry is based on the ratio of height to canopy

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Question: A database is
Answer: A type of data store that is used to store geographic data and non geographic

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Question: In which instance would you prefer a spatial database
Answer: Generally, whenever I get hold of a data source I should load it into a spatial database.

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Question: Why is it important to generate a spatial index for each layer loaded in the database ?.
Answer: To speed up rendering and fast retrieval of data when running SQL queries.

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