CEP Geographic Information Systems 2 — Questions and Answers
Question 1: Which GIS data model represents geographic features as a continuous surface divided into equal-sized cells?
- Vector model
- Raster model (Correct answer)
- TIN model
- Network model
Correct answer: Raster model
The raster model divides space into a grid of equal-sized cells, each storing an attribute value, making it ideal for continuous surfaces like elevation or temperature.
Question 2: In GIS, what does the term 'topology' primarily refer to?
- The visual style of map features
- The spatial relationships between geographic features (Correct answer)
- The coordinate system used for projection
- The resolution of raster datasets
Correct answer: The spatial relationships between geographic features
Topology defines the spatial relationships between features, such as adjacency, connectivity, and containment, ensuring data integrity in vector datasets.
Question 3: A planner needs to identify all parcels within 500 feet of a proposed industrial facility. Which GIS operation is most appropriate?
- Clip
- Buffer (Correct answer)
- Dissolve
- Union
Correct answer: Buffer
A buffer operation creates a zone of specified distance around a feature, allowing identification of all parcels within 500 feet of the facility.
Question 4: What is the primary purpose of a geodatabase in GIS?
- To display maps on the web
- To store, manage, and query spatial and attribute data in a structured format (Correct answer)
- To convert raster data to vector format
- To project data into a different coordinate system
Correct answer: To store, manage, and query spatial and attribute data in a structured format
A geodatabase is a structured container for storing geographic datasets, supporting spatial relationships, domains, and rules for data integrity.
Question 5: Which map projection preserves area and is most suitable for thematic maps showing regional distribution of environmental data?
- Mercator
- Albers Equal-Area Conic (Correct answer)
- Stereographic
- Robinson
Correct answer: Albers Equal-Area Conic
The Albers Equal-Area Conic projection preserves area relationships, making it ideal for thematic maps where accurate size comparison between regions is important.
Question 6: In remote sensing, what does NDVI measure?
- Soil moisture content
- Vegetation health and density (Correct answer)
- Water depth and clarity
- Urban heat island intensity
Correct answer: Vegetation health and density
The Normalized Difference Vegetation Index (NDVI) uses near-infrared and red bands to quantify vegetation health and density, ranging from -1 to +1.
Question 7: Which spatial analysis technique identifies areas where multiple environmental constraints overlap to find the best site for a facility?
- Kriging interpolation
- Network analysis
- Weighted overlay suitability analysis (Correct answer)
- Kernel density estimation
Correct answer: Weighted overlay suitability analysis
Weighted overlay suitability analysis combines multiple raster layers, each representing a constraint or opportunity, to identify optimal locations for facilities.
CEP Geographic Information Systems 2
Which GIS data model represents geographic features as a continuous surface divided into equal-sized cells?