# Adding TravelTime as Impedance in ArcGIS Network Analyst?

Geographic Information Systems## How is impedance chosen while selecting the shortest route?

If the impedance is a time attribute with live or historical traffic, then the best route is the quickest route for a given time of day and date. Hence, **the best route can be defined as the route that has the lowest impedance, or least cost, where the impedance is chosen by you**.

## How to use network analyst in ArcGIS?

**Enabling the ArcGIS Network Analyst extension in ArcMap**

- Start either ArcMap or ArcCatalog. Start ArcMap by clicking Start > All Programs > ArcGIS > ArcMap.
- Click Customize > Extensions. The Extensions dialog box opens.
- Check the Network Analyst check box.
- Click Close.

## What are the list of network attributes?

Network attributes have five basic properties: **name, usage type, units, data type, and use by default**.

## Which of the types of impedance within a network is the easiest to use because it is available for all line data?

**Resistive impedance matches** are easiest to design and can be achieved with a simple L pad consisting of two resistors. Power loss is an unavoidable consequence of using resistive networks, and they are only (usually) used to transfer line level signals.

## How do you add impedance?

Impedance is an AC characteristic of a circuit that may vary with the operating frequency. It is normally represented by Z = R – j/ωC + jωL where ω= 2πf.

What is the difference between impedance and resistance?

Resistance | Impedance |
---|---|

Denoted by ‘R’ | Denoted by ‘Z’ |

## How do you calculate impedance?

Line impedance is the ratio of complex line voltage to complex line current. You can calculate it with the following equation: Z(z) = V(z)/I(z).

## What is turn impedance?

[network analysis] In network analysis, **the cost of making a turn at a network node**.

## How do you collect data for network analysis?

The most common data collection methods used in SNA are **surveys and interviews**. A survey should include questions regarding the background of the respondent and a way for them to provide information on connections .

## What are the methods of network analysis in GIS?

The six kinds of network analysis layers in ArcGIS include: route analysis layer, closest facility analysis layer, service area analysis layer, OD cost matrix Page 12 analysis layer, vehicle routing problem analysis layer, location-allocation analysis layer.

## What determines the impedance of a cable?

At low frequencies the impedance is largely a function of the conductor size (resistance), but at high frequencies, **conductor size, insulation material and insulation thickness** all affect the cable’s impedance.

## What factors determine impedance?

Four electrical quantities determine the impedance (Z) of a circuit: **resistance (R), capacitance (C), inductance (L) and frequency (f)**. The following section on reactance explains how capacitance, inductance and frequency affect impedance.

## On what factors does impedance depend?

In general, it depends upon **the frequency of the sinusoidal voltage**. Impedance extends the concept of resistance to alternating current (AC) circuits, and possesses both magnitude and phase, unlike resistance, which has only magnitude.

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