The document provides an overview of network analysis, defining networks and their types, including transportation and utility networks. It describes various network analysis operations such as shortest path analysis, best route determination, and closest facility identification, and explains how these analyses are implemented in GIS software like ArcGIS. Additionally, it discusses concepts like allocation, location-allocation, and the od-cost matrix, highlighting their applications in optimizing resource use and service delivery.

1. NETWORK ANALYSIS
Swapnil R. Rajput
Roll No:19 , M.tech 1st year

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. 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. 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.  In ArcGIS ,Transportation network modeled
using network dataset.
 For Utility Dataset in ArcGIS modeled using
geometric dataset.

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. TYPES OF OPERATION:
 Shortest path analysis
 Best Route
 Closest facility
 Allocation
 location-Allocation
 OD-cost matrix
 Network-partitioning

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. 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. 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. 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. Along with the best route, ArcGIS Network Analyst provides
directions with turn-by-turn maps that can be printed.

13. CLOSEST FACILITY:
Closest facility finds the closest facility, such as a hospital,
fire station, or ATM, to any location on a network.

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. 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. OD-COST MATRIX:
 OD cost matrix is a table that contains the network
impedance from each origin to each destination.

18. 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.

19. 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

20. THANK YOU 4 YOUR ATTENTION !