Network analysis in gis , part 1 introduction

A network is a system of interconnected elements, such as edges (lines) and connecting junctions (points), that represent possible routes from one location to another.
Here I explained introduction to the network analysis in GIS.

1. Part 1 Introduction 
Dr. IBRAHIM BATHIS K https://www.linkedin.com/in/dribrahimbathisk/https://www.linkedin.com/in/dribrahimbathisk/

2. GEOGRAPHIC INFORMATION SYSTEM (GIS) A geographic information system (GIS) is a digital computer
application designed for the capture, storage, manipulation,
analysisanddisplayofgeographicinformation.
Geographic locationis the element that distinguishes
geographic information from all other types of information.
Withoutlocation,dataare termedto benon-spatialand would
havelittlevaluewithinaGIS.
Location is, thus, the basis for many benefits of GIS: the
ability to map, the ability to measure distances and the ability
totiedifferentkindsofinformationtogether becausetheyrefer
tothesameplacehttps://www.linkedin.com/in/dribrahimbathisk/

3. https://www.linkedin.com/in/dribrahimbathisk/

4. What is NETWORK? A network is a system of interconnected elements, such as
edges(lines)andconnectingjunctions(points),thatrepresent
possibleroutesfromonelocationtoanother.
Edges or Links
Junctions Or Nodeshttps://www.linkedin.com/in/dribrahimbathisk/

5. What is NETWORK? In general, a network is a system of interconnected linear
features through which resources aretransportedor
communicationisachieved.
The network data model is an abstract representation of the
componentsandcharacteristicsofreal-worldnetworksystems.
One major application of network analysis is found in
transportationplanning,wheretheissuemightbetofindpaths
corresponding to certain criteria, like finding the shortest or
least cost path between two or more locations, or to find all
locationswithinagiventravelcostfromaspecifiedorigin.https://www.linkedin.com/in/dribrahimbathisk/

6. What is NETWORK? Network Analysis in GIS is based on the mathematical sub-
disciplinesofgraphtheoryandtopology.
Topologicalpropertiesofnetworksare:
connectivity,adjacency,andincidence.
Thesepropertiesserveasabasisforanalysis.
A simple example of a network in GIS can be streets, power
lines,orcitycenterlines.https://www.linkedin.com/in/dribrahimbathisk/

7. What is NETWORK? People, resources, and goods tend to travel along networks:
cars and trucks travel on roads, airliners fly on predetermined
flightpaths,oilflowsinpipelines.
Informationnetworks
Socialnetworks
Streamnetworks
Transportationnetworks
By modeling potential travel paths with a network, it is
possible to perform analyses related to the movement of the
oil,trucks,orotheragentsonthenetwork.https://www.linkedin.com/in/dribrahimbathisk/

8. Spatial Examples
Electrical Gridhttps://www.linkedin.com/in/dribrahimbathisk/

9. Spatial Examples
Roadways (highways, freeways)
Roads and intersectionshttps://www.linkedin.com/in/dribrahimbathisk/

10. Spatial Examples
Pipelineshttps://www.linkedin.com/in/dribrahimbathisk/

11. Spatial Examples
Canals, streams, rivershttps://www.linkedin.com/in/dribrahimbathisk/

12. Spatial Examples
Shipping laneshttps://www.linkedin.com/in/dribrahimbathisk/

13. Spatial Examples
Migration paths
Social networks (non-spatial?)https://www.linkedin.com/in/dribrahimbathisk/

14. Classification of networkshttps://www.linkedin.com/in/dribrahimbathisk/

15. Classification of networks
Rivers flow in one direction only, downhill, so they are best
representedbyanorientednetwork.
Roads can either be oriented or not (i.e. one way or two way)
and usually contain loops, so either of the options with loops
willdohere.
Trainsusuallytravelinbothdirectionsbetweenstations.
On smaller lines with only one track the railway network is
unoreinted.
Elsewhere in the network there are lines designated for travel
inonedirectiononlyforreasonsofsafety.
Two-track networks are represented by a pair of oriented links
in a network and so either an oriented or unoriented network
withloopsmaybesuitablehttps://www.linkedin.com/in/dribrahimbathisk/

16. Types of network analysis layers ArcGIS Network Analyst allows you to solve common
networkproblems,
suchasfindingthebestrouteacrossacity,
findingtheclosestemergencyvehicleorfacility,
identifyingaserviceareaaroundalocation,
servicingasetoforderswithafleetofvehicles,or
choosingthebestfacilitiestoopenorclose.
Route
Closest facility
Service areas
OD cost matrix (an origin-destination ( OD) cost matrix from multiple origins
to multiple destinations)
Vehicle routing problem
Location-allocationhttps://www.linkedin.com/in/dribrahimbathisk/

17. Route
Closest Facility
Vehicle Routing
Problem
Location‐Allocation
Network Analysis 
Services
Solve transportation problems
Traffic
Service Areahttps://www.linkedin.com/in/dribrahimbathisk/

18. Directions (Route) Service Point-to-point routing –Simple
Route
Find the best route for visiting a
series of stops that minimizes
travel time or travel distance –
Optimized route
Use live traffic conditions
Driving directions in many languageshttps://www.linkedin.com/in/dribrahimbathisk/

19. Finding the best route
ArcGISNetworkAnalystcanfindthebestwaytogetfrom
one location to another or the best way to visit several
locations.
The locations can be specified interactively by placing points
on the screen, by entering anaddress, or by using points inan
existingfeatureclassorfeaturelayer.
The best route can be determined for the order of locations as
specifiedbytheuser.
Alternatively,ArcGISNetworkAnalystcandeterminethebest
sequencetovisitthelocations.https://www.linkedin.com/in/dribrahimbathisk/

20. What's the best route?
Whetherfindingasimpleroutebetweentwolocationsorone
that visits several locations, people usually try to take the best
route. But best route can mean different things in different
situations.
The best route can be thequickest, shortest, or most scenic
route, depending on the impedance chosen.Ifthe
impedanceistime,thenthebestrouteisthequickestroute.
Hence, the best route can be defined as the route that has the
lowestimpedance,wheretheimpedanceischosenbytheuser.
Anyvalidnetworkcostattributecanbeusedastheimpedance
whendeterminingthebestroute.https://www.linkedin.com/in/dribrahimbathisk/

21. The quickest path is shown in blue and has a
total length of 4.6 miles, which takes 8 minutes
the length of the shortest path is 4.5
miles, which takes 9 minuteshttps://www.linkedin.com/in/dribrahimbathisk/

22. Traffic  service
Visualize traffic speeds 
Support for live,  historical and 
predictive  
traffic conditions
Traffic Incidents
Background layer to display results 
from network  analysis  services
Data updated every five  minuteshttps://www.linkedin.com/in/dribrahimbathisk/

23. Closest  Facility service
•Find the closest facilities from each  incident
•Generate routes and driving  directions
You can also…
Use live traffic conditions
Limit  the search distance
Limit the number of facilities
to find
Travel from the facility to the incident https://www.linkedin.com/in/dribrahimbathisk/