GIS Geospatial Data Fundamentals 5

Question 1

What is the key difference between a geographic coordinate system and a projected coordinate system?

Accepted Answer

A geographic system uses a 3D ellipsoid reference; a projected system flattens it onto a 2D plane

Answer

A geographic CRS references positions on a 3D ellipsoidal model of the Earth using degrees of latitude/longitude, while a projected CRS maps that surface onto a flat plane with linear units.

Question 2

Which spatial data quality dimension addresses whether all required features are present in a dataset?

Accepted Answer

Completeness

Answer

Completeness measures whether a dataset contains all expected features and attributes and whether any are missing or redundant.

Question 3

What does the term 'scale' represent on a reference map?

Accepted Answer

The ratio of a distance on the map to the corresponding distance on the Earth's surface

Answer

Map scale expresses the relationship between map distance and real-world distance, written as a representative fraction (e.g., 1:24,000 means 1 unit on the map equals 24,000 units on the ground).

Question 4

In vector GIS, which geometry type is most appropriate for representing a city at a global map scale?

Accepted Answer

Point

Answer

At global scales, cities are too small to render as polygons and are best represented as point features, with their geographic center as the location.

Question 5

What is 'geocoding' in GIS?

Accepted Answer

Translating a textual address into geographic coordinates (a point location)

Answer

Geocoding matches address strings against a reference dataset (address locator) to generate point coordinates representing each address's location.

GIS - Geographic Information System Practice Test

GIS - Geographic Information System Practice Test

GIS Geospatial Data Fundamentals 5