Podcast
Questions and Answers
Which of the following best describes a junction in the context of network analysis?
Which of the following best describes a junction in the context of network analysis?
Which type of network typically allows travel on edges in both directions?
Which type of network typically allows travel on edges in both directions?
A county health inspector needs to visit several locations. Which network analysis technique would be most effective for determining the most efficient route?
A county health inspector needs to visit several locations. Which network analysis technique would be most effective for determining the most efficient route?
Which network analysis technique would be most appropriate for determining the number of hospitals within a 10-minute drive of schools?
Which network analysis technique would be most appropriate for determining the number of hospitals within a 10-minute drive of schools?
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What is the primary output of an origin-destination (OD) cost matrix analysis?
What is the primary output of an origin-destination (OD) cost matrix analysis?
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A city planner wants to determine the best locations to place new bus stops to maximize accessibility for residents. Which network analysis technique is most suitable for this?
A city planner wants to determine the best locations to place new bus stops to maximize accessibility for residents. Which network analysis technique is most suitable for this?
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Which of the following real-world constraints can be incorporated into network analysis?
Which of the following real-world constraints can be incorporated into network analysis?
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What is the main purpose of using network analysis in an interactive '15-minute city' map?
What is the main purpose of using network analysis in an interactive '15-minute city' map?
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What percentage of the population is within a 10-minute drive of a clinic (permanent or mobile) after adding 4 mobile clinics?
What percentage of the population is within a 10-minute drive of a clinic (permanent or mobile) after adding 4 mobile clinics?
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Which of the following is NOT a typical function performed using Network Analyst?
Which of the following is NOT a typical function performed using Network Analyst?
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What is the primary purpose of a network dataset in ArcGIS?
What is the primary purpose of a network dataset in ArcGIS?
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Which of the following is a key consideration when building a network dataset?
Which of the following is a key consideration when building a network dataset?
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You want to locate 4 library locations to be used as mobile clinics so most of the population is within a 10-min drive of a permanent clinic or new mobile clinic. What steps should you take?
You want to locate 4 library locations to be used as mobile clinics so most of the population is within a 10-min drive of a permanent clinic or new mobile clinic. What steps should you take?
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Which of the following data sources would be most appropriate for creating a detailed street network dataset?
Which of the following data sources would be most appropriate for creating a detailed street network dataset?
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Before adding mobile clinics, what percentage of the population is within a 10 minute drive of a permanent clinic?
Before adding mobile clinics, what percentage of the population is within a 10 minute drive of a permanent clinic?
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Which of the following tasks can be accomplished using ArcGIS Network Analyst?
Which of the following tasks can be accomplished using ArcGIS Network Analyst?
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Flashcards
Network
Network
A system of interconnected components representing routes between locations.
Edge
Edge
A line through which commodities flow, like water or electricity.
Junction
Junction
A point where two or more edges intersect or connect.
Utility Network
Utility Network
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Transportation Network
Transportation Network
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Route Analysis
Route Analysis
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Closest Facility Analysis
Closest Facility Analysis
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OD Cost Matrix
OD Cost Matrix
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Service area
Service area
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Block centroids
Block centroids
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Mobile clinics
Mobile clinics
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Network dataset
Network dataset
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Shortest path
Shortest path
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Location-Allocation
Location-Allocation
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Service Area Visualization
Service Area Visualization
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Study Notes
Network Analysis
- Network analysis is the study of interconnected elements, like edges (lines) and junctions (points), representing routes between locations.
- Edges represent pathways (e.g., roads, pipes, electrical lines), and commodity flows through them (e.g., water, electricity, vehicles).
- Junctions are intersections of multiple edges (e.g., intersections, valves).
- Junctions also include things like fuses, switches and service taps.
- GIS networks of two types include utility/river networks (e.g., water/electricity) and transportation networks (e.g., roads, pedestrian paths, train lines). Utility networks are one way, while transportation networks can be two-way.
- Network analysis in GIS can handle details like turn restrictions, speed limits, height restrictions, and traffic conditions varying throughout the day.
- Common network analysis techniques in GIS include finding routes, closest facilities, service areas, cost matrices for origins and destinations, and location allocation studies.
Types of Network Analysis
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Route analysis - determining the most efficient path between two points, useful for various applications such as delivery routes, emergency response, or inspector visits.
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Closest facility analysis - finding the closest facility (e.g., hospital, restaurant, library) from a given location.
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Service area analysis - defining an area that is reachable within a specific time or distance from a facility, enabling identification of services or events within bounds.
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OD cost matrix analysis - providing a table containing travel times or distances between all pairs of origins and destinations.
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Location-allocation analysis - determining the optimal location for new facilities based on population accessibility and demand.
Network Analysis Tools in GIS
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ArcGIS offers tools and workflows for network analyses. Steps involve creating a network dataset (based on line features) and then applying network analysis techniques such as:
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Finding shortest paths.
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Identifying closest facilities.
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Creating service areas with specific times.
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Calculating OD cost matrices, which is helpful for a list of places and travel times from each point to every other point.
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Location-allocation analysis to decide where new resources should be placed to best serve the community.
Tools and Data Sources
- OpenStreetMap is a helpful source of road and other spatial data for GIS.
- MassGIS and other locally provided data may also be useful for network analysis.
- ESRI data, can offer additional options to use in GIS, and includes tutorials for network analysis.
Additional Information
- Examples from the provided material illustrate variety of relevant uses.
- These include location examples such as finding hospitals/clinics locations in a given time range to serve the population.
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Description
Explore the fundamental concepts of network analysis within Geographic Information Systems (GIS). This quiz covers the characteristics of edges and junctions, the types of networks, and common techniques for analyzing routes and flows. Test your knowledge on how different factors influence network operations.
