GIS Conceptual Foundations 3

Question 1

Which type of coordinate system uses latitude and longitude to describe positions on Earth?

Accepted Answer

Geographic coordinate system

Answer

A geographic coordinate system (GCS) uses angular units (degrees of latitude and longitude) referenced to a datum to locate positions on Earth's surface.

Question 2

What is the role of a datum in a coordinate reference system?

Accepted Answer

It specifies how the coordinate system is aligned to Earth's surface

Answer

A datum defines the reference ellipsoid and its orientation relative to the Earth, anchoring the coordinate system to the physical world.

Question 3

Which GIS data quality dimension measures how well spatial data represents its real-world location?

Accepted Answer

Positional accuracy

Answer

Positional accuracy describes how closely the recorded coordinates of a feature match its true location on Earth.

Question 4

A raster dataset has a cell size of 30 meters. What does this mean?

Accepted Answer

Each cell represents a 30×30 meter area on the ground

Answer

A 30-meter cell size means each pixel represents a 30 by 30 meter square area on Earth's surface.

Question 5

What is the main advantage of vector data over raster data for representing discrete features like roads?

Accepted Answer

Vector data precisely represents boundaries and lines without pixelation

Answer

Vector data stores features as exact coordinates, making lines and polygons sharp and scalable regardless of zoom level.

GIS - Geographic Information System Practice Test

GIS - Geographic Information System Practice Test

GIS Conceptual Foundations 3