GIS Conceptual Foundations 4 — Questions and Answers
Question 1: What is the key characteristic of a 'topological' data model in GIS?
- It stores data in raster grid format
- It explicitly encodes spatial relationships such as adjacency and connectivity between features (Correct answer)
- It uses only point features to represent geography
- It requires data to be stored in cloud databases
Correct answer: It explicitly encodes spatial relationships such as adjacency and connectivity between features
Topological data models encode spatial relationships (shared edges, node connectivity, polygon adjacency) so GIS can perform network analysis and enforce geometric integrity.
Question 2: What does MAUP stand for, and why is it important in GIS analysis?
- Map Attribute Uncertainty Problem — affects color choices
- Modifiable Areal Unit Problem — aggregating data into zones can change analytical results (Correct answer)
- Multiple Area Update Protocol — used for real-time data syncing
- Maximum Attribute Uncertainty Parameter — controls rounding errors
Correct answer: Modifiable Areal Unit Problem — aggregating data into zones can change analytical results
The Modifiable Areal Unit Problem describes how the size and shape of aggregation zones (like census tracts) can significantly alter statistical results.
Question 3: Which of the following best describes 'metadata' in a GIS context?
- The visual symbology applied to a layer
- Data that describes the content, quality, and context of a spatial dataset (Correct answer)
- The raw coordinate values stored in a shapefile
- A summary table of attribute statistics
Correct answer: Data that describes the content, quality, and context of a spatial dataset
Metadata is documentation that describes a dataset's origin, accuracy, coordinate system, date of creation, and other characteristics essential for proper use.
Question 4: In GIS, what is a 'projection' designed to do?
- Display 3D terrain as a hillshade
- Transform 3D Earth coordinates onto a 2D flat surface (Correct answer)
- Convert attribute data into spatial features
- Index spatial features for faster query performance
Correct answer: Transform 3D Earth coordinates onto a 2D flat surface
A map projection is a mathematical transformation that converts the curved surface of the Earth onto a flat plane, necessarily introducing some distortion.
Question 5: A GIS data model that uses nodes, edges, and faces to encode spatial relationships is called a:
- Raster grid
- Planar graph topology (Correct answer)
- TIN surface
- Object-relational model
Correct answer: Planar graph topology
A planar graph topology explicitly stores nodes (intersection points), edges (line segments), and faces (enclosed areas) and their relationships.
Question 6: What does 'spatial resolution' mean when referring to satellite imagery?
- The number of spectral bands captured
- The smallest object that can be distinguished in the image (Correct answer)
- The geographic area covered by the image
- The time interval between image captures
Correct answer: The smallest object that can be distinguished in the image
Spatial resolution defines the minimum feature size detectable in an image, determined by the ground sampling distance (GSD) of each pixel.
Question 7: Which GIS concept refers to the phenomenon where features near the edge of a study area may be artificially truncated or underrepresented?
- Scale bias
- Edge effect (Correct answer)
- Projection distortion
- Attribute null error
Correct answer: Edge effect
The edge effect occurs when spatial analysis near the boundary of a study area underrepresents features that extend beyond the boundary, skewing results.
GIS Conceptual Foundations 4
What is the key characteristic of a 'topological' data model in GIS?