GIS GIS - Geographic Information System Network Analysis and Transportation Questions and Answers 2 — Questions and Answers
Question 1: Which concept describes the ability of a network edge to be traveled in only one direction?
- Turn restriction
- One-way restriction (Correct answer)
- Edge directionality
- Flow constraint
Correct answer: One-way restriction
A one-way restriction means network traversal is permitted only in the digitized direction (or opposite) of a road segment.
Question 2: In GIS, what is a 'network junction' (node)?
- A road segment with an assigned speed limit
- A point where two or more network edges meet or intersect (Correct answer)
- A polygon feature defining a service zone
- A raster cell representing road surface quality
Correct answer: A point where two or more network edges meet or intersect
A network junction is a point feature at which two or more edges connect, enabling connectivity and turn evaluation.
Question 3: Location-allocation analysis in GIS is used to:
- Find the optimal placement of facilities to best serve a set of demand points (Correct answer)
- Calculate shortest paths between facility pairs
- Generate buffers around transit stops
- Assign address ranges to street segments
Correct answer: Find the optimal placement of facilities to best serve a set of demand points
Location-allocation simultaneously selects facility locations and allocates demand to them to minimize total travel cost or maximize coverage.
Question 4: What does 'connectivity policy' determine in a GIS network dataset?
- The maximum allowable vehicle weight per edge
- How and when edges and junctions connect to each other (Correct answer)
- The coordinate reference system of the network
- The rendering symbology for road classes
Correct answer: How and when edges and junctions connect to each other
The connectivity policy specifies whether features connect at endpoints only, at any vertex, or via elevation fields to prevent grade separations.
Question 5: In transit network analysis, what is a 'headway'?
- The distance between two consecutive bus stops
- The time interval between successive transit vehicle departures on a route (Correct answer)
- The maximum capacity of a transit vehicle
- The fare cost assigned to a transit segment
Correct answer: The time interval between successive transit vehicle departures on a route
Headway is the scheduled time gap between consecutive vehicles on a transit line, affecting wait time and service frequency modeling.
Question 6: Which GIS technique is used to model the flow of traffic or resources through a network to identify congestion points or bottlenecks?
- Topological overlay
- Network flow analysis (Correct answer)
- Spatial autocorrelation
- Kernel density estimation
Correct answer: Network flow analysis
Network flow analysis assigns quantities to network edges and solves for optimal or constrained movement through the system.
GIS GIS - Geographic Information System Network Analysis and Transportation Questions and Answers 2
Which concept describes the ability of a network edge to be traveled in only one direction?