Final answer:
An attribute-based (thematic) description in GIS refers to the data or information related to specific characteristics or features of Oregon.
Step-by-step explanation:
In a GIS sense, an attribute-based (thematic) description of Oregon would primarily refer to the data or information related to specific characteristics or features of the state. These attributes can include various thematic elements such as land use, population density, elevation, climate, vegetation, or any other data that provides insight into the characteristics and characteristics of Oregon. For example, if we have a GIS map of Oregon that displays the population density of different counties, the attribute-based description would provide information about the population distribution and density of each county.