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# Network analysis in gis

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network analysis in gis content basesd on representing rivers , roads, waterlines , telecommunication lines ...plz go through it thanks

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### Network analysis in gis

1. 1. NETWORK ANALYSIS Swapnil R. Rajput Roll No:19 , M.tech 1st year
2. 2. WHAT IS NETWORK ?  Network is a set of connected lines  Network can represent rivers , roads, waterlines , telecommunication lines etc.  Networks can be Directed and Undirected / planer and non-planner.  In GIS Networks are widely used for two kinds of modeling. Transportation network Utility network
3. 3. TRANSPORTATION NETWORK:  Undirected networks.  edge on a network may have a direction assigned to it, the person or resource being transported is free to decide the direction, speed, and destination of traversal. example-person in a car travelling on street.
4. 4. UTILITY NETWORK:  Directed network  Path is predetermined  It can be change but not by agent. The electricity flows around the circuit and lights the bulb
5. 5.  In ArcGIS ,Transportation network modeled using network dataset.  For Utility Dataset in ArcGIS modeled using geometric dataset.
6. 6. NETWORK ANALYSIS:  Network analysis analyze the way ‘goods’ can be transported along these lines (telecommunication lines , road etc) Example: undirected roads.  Network analysis can be done in raster or in vector.
7. 7. TYPES OF OPERATION:  Shortest path analysis  Best Route  Closest facility  Allocation  location-Allocation  OD-cost matrix  Network-partitioning
8. 8. SHORTEST PATH ANALYSIS:  Shortest path analysis finds the path with the minimum cumulative impedance between nodes on a network. The path may connect just two nodes an origin and a destination or have specific stops between the nodes. (1) (2) (3) (4) (5) (6) (1) ∞ 20 53 58 ∞ ∞ (2) 20 ∞ 39 ∞ ∞ ∞ (3) 53 39 ∞ 25 ∞ 19 (4) 58 ∞ 25 ∞ 13 ∞ (5) ∞ ∞ ∞ 13 ∞ 13 (6) ∞ ∞ 19 ∞ 13 ∞ Fig: Link impedance matrix values between cities on a road network.
9. 9. BEST ROUTE:  Whether finding a simple route between two locations or one that visits several locations, people usually try to take the best route. But "best route" can mean different things in different situations.  Best route can be the quickest, shortest, or most scenic route, depending on the impedance chosen.  Impedance  time, distance.
10. 10. We uses time as an impedance. The quickest path is shown in blue and has a total length of 4.5 miles, which takes 8 minutes to traverse.
11. 11. We choose distance is chosen as the impedance. Consequently, the length of the shortest path is 4.4 miles, which takes 9 minutes to traverse.
12. 12. Along with the best route, ArcGIS Network Analyst provides directions with turn-by-turn maps that can be printed.
13. 13. CLOSEST FACILITY: Closest facility finds the closest facility, such as a hospital, fire station, or ATM, to any location on a network.
14. 14. ALLOCATION:  Allocation measures the efficiency of public facilities, such as fire stations, or school resources, in terms of their service areas. Figure: Service areas of two fire stations within a 2-minute response time.
15. 15. LOCATION-ALLOCATION:  Location-allocation helps you choose which facilities from a set of facilities to operate based on their potential interaction with demand points.
16. 16. OD-COST MATRIX:  OD cost matrix is a table that contains the network impedance from each origin to each destination.
17. 17. NETWORK PARTITIONING-TRACE  Trace analysis is performed when we want to understand which part of network is ‘conditionally connected’ to a chosen node on the network ,known as trace origin.
18. 18. REFERENCES:  http://webhelp.esri.com  Geographic Information System, Kang-tsung Chang, fourth edition Tata McGraw-Hill.  Spatial data analysis by Ms. Vandita Srivastava IIRS Dehradun,India  ArcGIS 10 help
19. 19. THANK YOU 4 YOUR ATTENTION !