Network Analysis in ArcGIS

What is Network Analysis

A network Analysis is a system of interconnected elements, such as edges (lines) and connecting junctions (points), that represent possible routes from one location to another.

Network Dataset

The Network Analysis in GIS is based on the mathematical sub-disciplines of graph theory and Topology. The network analysis in GIS consists of a set of connected vertices and edges.

In this Tutorial, perform Network analysis in ArcGIS using kolkata street dataset.

1. Right click the street feature dataset(kolkata_route_map) and click New > Network Dataset.

2. The New Network Dataset wizard opens, enter the Name, and Click Next. Click Yes to model turns in the network and click Next.

3. Click Connectivity, the Connectivity dialog box opens. Here you can set up the connectivity model for the network. For this Streets Feature class, all streets connect to each other at endpoints. Make sure that the connectivity policy of Streets is set to End Point. Click OK to return to the new Network Dataset wizard, and Click Next.

4. would you like to model this Elevation of your network features, choose None and click Next.

5. Setting network attributes is display, all are default setting is Ok, click Next and skip it.

6. Click Yes to set up directions, Click Directions. The Network Directions Properties dialog box open. On the General tab, you also change length unites.

Now set the Direction, click Next. A summary of all the settings is displayed for your review, click Finish

Finish the Network Dataset, build Network Dataset massege box is appears, click Yes. Then choose all are dataset Add in Arc map, yon can choose Yes, otherwise next time drag and add the dataset.

Finding the Best Route using network dataset

Now just open your network dataset route (Kolkata_route_map_ND), and kolkata govt. hospital.

Enable the ArcGIS Network Analyst extension.

1.Customize > Extensions. The Extensions dialog box open, Check Network Analyst and Click Close.

2. Now open Network Analyst Toolbar. Click Customize > Toolbars > Network Analyst.

3. Now add Network Analyst Toolbar, Click Network Analyst Dropdown and select New Route.

4. On the Network Analyst toolbar, click the Network Analyst window button. The route analysis layer is added to the Network Analyst window (Stops, Routes, Point Barriers, Line Barriers, and Polygon Barriers).

The analysis layer is also added to the Table Of Contents window.

5. In the Network Analyst window, click Stops. On the Network Analyst toolbar, click the Create Network Location Tool  and Click anywhere on the street network to define a new stop location.

6. Now click the slove button. Network Analyst calculates the best route.

Closest Facility

Follow the same process to previous exercise.

1. Click Network Analyst Dropdown and select New Closest Facility.

2. The closest facility analysis layer is added to the Network Analyst window(Facilities, Incidents, Routes, Point Barriers, Line Barriers, and Polygon Barriers).

The analysis layer is also added to the Table Of Contents window

3. you will load facilities from a point feature layer that represents kolkata govt. hospital

4. In the Network Analyst window, right-click Facilities and click Load Locations. The Load Locations dialog box open, Choose kolkata_govt_hospital from the Load From drop-down list and click OK.

5. The next step is add Incidents. In the Network Analyst window, right-click Incidents, and choose Find Address.

6. Now click the slove button. Network Analyst calculates the closest facility on the basis of incidents.

Calculating service areas

1. Click Network Analyst on the Network Analyst toolbar and click New Service Area.

2. The service area analysis layer is added to the Network Analyst window (Facilities, Polygons, Lines, Point Barriers, Line Barriers, and Polygon Barriers).

The analysis layer is also added to the Table Of Contents window.

3. Now you will add facilities by use create network location tool (you can also load facilities) for which the service area polygons will be generated.

4. Click the Analysis Layer Properties button on the Network Analyst window, and  go to Analysis Settings tab.

5. Setting Default Breaks (single-1000 m, or multiple-1000, 2000, 3000m). Check Oneway in the Restrictions list.