QUESTIONS AND ANSWERS 100%
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What is the difference between a Projected Coordinate System and a Geographic
Coordinate System? - ✔✔A Geographic Coordinate System is used to locate objects on
the curved surface of the Earth.
A Projected Coordinate System is used to locate objects on a flat surface, e.g. a paper
map
[What are the features of a Geographic Coordinate System? How do they
measure/indicate location?] - ✔✔Graticule - consists of intersecting vertical and
horizontal lines, which are called longitude (meridians) and latitude (parallels)
respectively.
Measurements are expressed in degrees, minutes, and seconds.
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, What is an attribute? - ✔✔Information about a geographic feature in a GIS, generally
stored in a table and linked to the feature by a unique identifier. For example, attributes
of a river might include its name, length, and average depth.
What is a class? - ✔✔A group or category of attribute values; a set of entities possessing
certain common attribute values.
What is a coordinate system? - ✔✔A reference system used to locate geographic
features on a two- or three-dimensional surface. A coordinate system is comprised of a
spheroid, datum, projection, and units. Common coordinate systems are geographic
(three-dimensional), in which locations are measured in degrees of latitude and
longitude, and planar (also called projected or Cartesian), in which the earth's surface is
projected onto a two-dimensional plane and locations are measured in meters or feet.
What is a datum? - ✔✔The reference specifications of a measurement system, usually a
system of coordinate positions on a surface (a horizontal datum) or heights above or
below a surface (a vertical datum).
What is an element? - ✔✔A component of a model. Elements can be variables, such as
input and derived data, or tools.
What is a feature? - ✔✔A representation of a real-world object on a map. Features can
be represented in a GIS as vector data (points, lines, or polygons) or as cells in a raster
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