GIS Conceptual Foundations 2

Question 1

Which concept describes the minimum unit of geographic space that a GIS can represent?

Accepted Answer

Grain

Answer

Grain refers to the smallest distinguishable unit in a spatial dataset, analogous to pixel size in raster data.

Question 2

What does the term 'spatial autocorrelation' mean in GIS?

Accepted Answer

Nearby locations tend to have similar attribute values

Answer

Spatial autocorrelation, described by Tobler's First Law, states that nearby things are more related than distant things.

Question 3

A GIS analyst needs to represent continuous phenomena like elevation. Which data model is most appropriate?

Accepted Answer

Raster

Answer

Raster data models store continuous surface values in a grid of cells, making them ideal for elevation, temperature, and similar phenomena.

Question 4

What is the primary purpose of a spatial index in a GIS database?

Accepted Answer

To accelerate spatial queries by organizing features by location

Answer

Spatial indexes (e.g., R-trees, quadtrees) organize geometries so the database can quickly find features within a query area without scanning every record.

Question 5

Which statement best describes 'scale' in the context of GIS?

Accepted Answer

The ratio of map distance to real-world distance

Answer

Map scale is the ratio between a distance on the map and the corresponding distance on the Earth's surface.

GIS - Geographic Information System Practice Test

GIS - Geographic Information System Practice Test

GIS Conceptual Foundations 2