GIS Exam Study Guide with Complete
Solutions
Spatial data - Answer-All of the information that can be tied to a specific locations.
Data with a geographic location, representation, or reference point that it describes.
Visually represented as layers which allow the user to select different sets...
Raster - Answer✔✔-Spatial data that stores location based upon single origin point and a data stream of
known width, height, and resolution. Often used for continuous surfaces.
Rasters are characterized primarily by their width, height, cell size, and origin location. Each cell in a
single-band raster contains one value for the area covered by that pixel.
A grid of pixels with a uniform value within each pixel.
DEM - Answer✔✔-Digital Elevation Model- a representation of the terrain surface, created by measuring
a set of equally spaced elevation values
A specific case of raster data where the pixel value represents the elevation of areas covered by the
pixel. Sometimes called a DTM (digital terrain model) or DED (digital elevation dataset).
Vector - Answer✔✔-Spatial data that stores location using Cartesian coordinate locations.
Point - Answer✔✔-A single spot in (usually) two dimensional space. Attributes represent only that
location (and sometimes are inferred to represent nearby locations)
Line (Polyline) - Answer✔✔-Multiple points connected to represent all locations in between along the
connection.
Polygon - Answer✔✔-Multiple polylines connected to create a boundary.
Polygon zones are generalized representations where all location contained within the boundaries are
considered to have the same property.
Coordinate System / Spatial Reference - Answer✔✔-Defines the origin point, coordinate space, and
geoid for a dataset's spatial data
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