GIS GIS - Geographic Information System Network Analysis and Transportation Questions and Answers 1 — Questions and Answers
Question 1: Which GIS network analysis function finds the shortest path between two points based on travel cost or distance?
- Closest facility
- Route analysis (Correct answer)
- Service area analysis
- OD cost matrix
Correct answer: Route analysis
Route analysis determines the shortest or fastest path between an origin and destination using network cost attributes.
Question 2: In a GIS network dataset, what attribute defines how much it costs to travel along an edge (road segment)?
- Impedance (Correct answer)
- Hierarchy
- Connectivity
- Descriptor
Correct answer: Impedance
Impedance is the cost attribute (such as time or distance) assigned to a network edge that is minimized during routing.
Question 3: A service area polygon in network analysis represents:
- The bounding box of the network dataset
- All locations reachable from a facility within a given cost threshold (Correct answer)
- The convex hull of all network nodes
- The buffer around a road centerline
Correct answer: All locations reachable from a facility within a given cost threshold
A service area delineates all locations accessible from a facility within a specified travel time or distance limit.
Question 4: Which network analysis solver identifies the nearest facility to a set of incidents from a list of candidate facilities?
- Route solver
- Service area solver
- Closest facility solver (Correct answer)
- Location-allocation solver
Correct answer: Closest facility solver
The closest facility solver finds the one or more facilities nearest to each incident based on network travel cost.
Question 5: In GIS transportation analysis, a 'turn restriction' is used to:
- Limit the number of vehicles on a road
- Prevent or penalize specific turn movements at intersections (Correct answer)
- Define speed limits on road segments
- Identify one-way streets
Correct answer: Prevent or penalize specific turn movements at intersections
Turn restrictions model real-world prohibitions such as no-left-turn rules at intersections within the network dataset.
Question 6: The Origin-Destination (OD) Cost Matrix solver in GIS network analysis is primarily used to:
- Find the single shortest route for a delivery truck
- Calculate travel costs from multiple origins to multiple destinations simultaneously (Correct answer)
- Generate isochrone maps for emergency planning
- Identify gaps in road network connectivity
Correct answer: Calculate travel costs from multiple origins to multiple destinations simultaneously
The OD Cost Matrix computes the least-cost path between every origin-destination pair, supporting logistics and accessibility studies.
GIS GIS - Geographic Information System Network Analysis and Transportation Questions and Answers 1
Which GIS network analysis function finds the shortest path between two points based on travel cost or distance?