The concept of overlay in geographic information systems (GIS) refers to the
A. inclusion of a grid (such as latitude-longitude or universal Transverse Mercator) on a digital spatial dataset (map).
B. incorporation of multiple types of digital spatial data (maps) in answering research questions.
C. constant, automatic updating of digital spatial data (maps) of the same type with newer data.
D. use of digital spatial data (maps) to identify what lies deep beneath the Earth's surface.
Answer: B
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A) are the actions taken by humans in the environment in which they live B) is the extrinsic value placed on people, organisms, and objects in the environment C) is the study of the economic value of all living things in their environment D) are the rules and values humans use to guide environmental decisions
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