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UNC-Chapel Hill GEOG 192 - Lecture 10 - Network Analysis

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Lecture 10 Network Analysis (1)10-1 Data Requirement in Network Analysis10-1 Data Requirement in Network Analysis (Cont.)10-2 Examples of Network Analysis10-2 Examples of Network Analysis (Cont.)10-3 Find the optimal path10-4 Find the closest facility10-4 Find the closest facility (Cont.)10-5 Map Accessibility10-5 Map Accessibility (Cont.)10-6 Define service areas10-6 Define service areas (Cont.)19/1/1419/1/14Jun Liang, Geography @ UNCJun Liang, Geography @ UNC11Lecture 10 Network Analysis (1)Spatial analysis of line features deals with two types of problems:-The structure of connection among line features.-The movement in the system through the connected lines.Connected lines define a network.19/1/1419/1/14Jun Liang, Geography @ UNCJun Liang, Geography @ UNC2210-1 Data Requirement in Network 10-1 Data Requirement in Network AnalysisAnalysisNetwork – A network consists of a number of line segments that are interconnected in some way.Segment – Each line segment is defined by start and end nodes, both of known locations.Vertices – A segment may contain intermediate points of known locations between the start and the end nodes. Such intermediate points refine the shape of the segment and are called vertices.19/1/1419/1/14Jun Liang, Geography @ UNCJun Liang, Geography @ UNC3310-1 Data Requirement in Network 10-1 Data Requirement in Network Analysis (Cont.)Analysis (Cont.)Questions: Minimum number of vertices? Segments? Nodes?19/1/1419/1/14Jun Liang, Geography @ UNCJun Liang, Geography @ UNC4410-2 Examples of Network 10-2 Examples of Network Analysis Analysis •solve different routing problems •display customized directions •find the closest facility •find the distances to all facilities •find locations that are accessible to a facility using service areas and networks •create multiple nested or overlapping service areas19/1/1419/1/14Jun Liang, Geography @ UNCJun Liang, Geography @ UNC5510-2 Examples of Network 10-2 Examples of Network Analysis (Cont.)Analysis (Cont.)Three examples that demonstrate the basic functionality of Network Analyst (from top).1. Finding the best route2. Finding the closest facility3. Determining service areas19/1/1419/1/14Jun Liang, Geography @ UNCJun Liang, Geography @ UNC6610-3 Find the optimal path10-3 Find the optimal pathThis path represents a delivery truck route.With Network Analyst, the dispatcher can define a route that will stop at each restaurant in the most efficient order and return to the warehouse.19/1/1419/1/14Jun Liang, Geography @ UNCJun Liang, Geography @ UNC7710-4 Find the closest facility10-4 Find the closest facilityThis example shows the closest emergency room to a traffic accident. As with routes, you can get the directions for driving to the emergency room or the directions for an ambulance to drive to the accident.19/1/1419/1/14Jun Liang, Geography @ UNCJun Liang, Geography @ UNC8810-4 Find the closest facility 10-4 Find the closest facility (Cont.)(Cont.)This example shows the paths and the distances to all the facilities. This information could be very useful to the ambulance dispatcher if the closest facility was unavailable.19/1/1419/1/14Jun Liang, Geography @ UNCJun Liang, Geography @ UNC9910-5 Map AccessibilityThis example shows the streets, or portions of streets, that are within a specified distance of a shopping mall. You can also see that some of the ATMs, banks, and restaurants are located on these streets.19/1/1419/1/14Jun Liang, Geography @ UNCJun Liang, Geography @ UNC101010-5 Map Accessibility (Cont.)A service area polygon created by Network Analyst can be used with ArcView's spatial analysis tools to find locations within 2 kilometers of the mall. Once identified, you can find the closest facility to the mall.19/1/1419/1/14Jun Liang, Geography @ UNCJun Liang, Geography @ UNC111110-6 Define service areas10-6 Define service areasThis example shows that parts of the city contained in the service area are not actually reached by the streets in the service network.19/1/1419/1/14Jun Liang, Geography @ UNCJun Liang, Geography @ UNC121210-6 Define service areas (Cont.)10-6 Define service areas (Cont.) A service area was created using only the areas of the city that can actually be reached by the service


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UNC-Chapel Hill GEOG 192 - Lecture 10 - Network Analysis

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