Simulation Results: A Closer Look I.e., Analysis, Validation, Visualization.

Simulation Results: A Closer Look

I.e., Analysis, Validation, Visualization

2Learning Objectives

• Creating and analyzing traffic count comparisons

• Getting a rough idea of further analysis measuresand validation problems

• Using the On-The-Fly-Visualizer (OTFVis)

3Now!

• Start download of

– wuIST.mvi and– wuWU.mvi (> 60 MB, each)

– (zurich-switzerland.xml)

• @ http://www.matsim.org/node/412 → Exercises

→ Exercise 1 and (2)

4Traffic Counts

• Average hourly volumes of avg. working day• Future: Median, Variance, Max, Min (n days)

5Traffic Counts: Formats - KML

6Traffic Counts: Formats –TXT, HTML

7Traffic Counts: Parameters

Config file

<module name="…">…</module>

<module name="counts"> mandatory: <param name="inputCountsFile"

value="/path/to/counts.xml" /> <param name="outputformat" value="txt, html, kml" />

optional: <param name="countsScaleFactor" value="Double > 0 " /><param name="distanceFilter" value="Double >= 0" /> <param name="distanceFilterCenterNode"

value="String" /> </module>

8Traffic Counts: Parameters<param name="distanceFilter" value= "15000" /> <param name="distanceFilterCenterNode" value= "2531" />

Swisstopo

9Traffic Counts: Ex Post Creation

• Restraining the area of analysis

• Take

playground.anhorni.kti.CountsAnalyser or

playground.dgrether.analysis.CountsAnalyser

as an example

(will be implemented in the core soon)

• linkstats.txt → counts

10Traffic Counts Creation: Example CH

Raw count dataASTRA, cantons, cities

FilteringDIDOPublic HolidaysSummer HolidysOutliers

Averagingper station

Map MappingStations → LinksNAVTEQTELEATLASARE…

xml schemacounts_v1.xsdhttp://matsim.org/files/dtd/counts_v1.xsd

counts.xml

Parser/Writer

ConversionTXT → XML

11Further Analysis / Validation Measures

• Swiss Microcensus– Trip length and duration distributions– Modal Split

Spiders

Volumes Route switchers

12Validation Issues

• Lack of Validation Data and System Specification– Level of aggregation (analysis and modeling)

(e.g. count data vs. avg. trip length, route switcher analysis etc.)– MS = Sampling tool → Ensemble runs → confidence intervals

etc. (computational costs!)

• Future Measures– Travel speeds (underestimation: junction dynamics, non-

linearities?)– Facility loads (e.g., retailer consumer cards)

• A lot of interesting future work!

13Visualizers

OTFVisJava + OpenGL

MATVis ReplayC++

14OTFVis: Live Mode

config

Interactive queries in the live mode

15OTFVis: Playback Mode

mvi file

events file +

network file

16OTFVis: Playback Mode

Queries in the playback mode

Written in C++

Events not compatible mit Java Mobsim

MATVis Replay

(Daumenkinos)

Interactive queries in the live modelarge scale simulations: time and memory consuming

Room for participation

17Exercises – OTFVis: Westumfahrung

1. WU: Bypass Zurich

→ M. Balmer (15:30)

18Exercises - OTFVis

1. Building the bypass (WU) has made worse a prominent bottleneck in the region of Zurich. Try to locate it by using the OTFVis. It is best visible between ~ 7:15 and 9:00.

It is not visible very clearily in our results, but …

Hint:

19Exercises – OTFVis

Comparing 2 WU (Westumfahrung) scenarios

Scenario 1: actual state (base case)

=> convert events.run365.it150.txt.gz → wuIST.mvi 60

Scenario 2: with bypass (Westumfahrung)

=> convert events.run370.it220.txt.gz → wuWU.mvi 60

20Exercises - OTFVis

Comparing 2 scenarios with OTFVis

21Exercises – Google Earth

2. a) Using Google Earth with 100.countscompare.kmz look at the count stations in the south of Switzerland (Tessin, e.g., Lugano, Mendrisio).

b) Look at the count stations in the center of Zurich (e.g.,Rosengartenstrasse, Nordring)

c) What is the difference? What is the problem in question a)

22Exercises – Counts Configuration & OTFVis

Config file<module

name="counts"> <param name=„…

</module>

3. Configure a ZH simulation based on zurich-switzerland.xml such that counts are plotted only within a restricted area:

center = Bellevue and radius = 10 km.

I.e.; inspect network by OTFVis and define distanceFilterCenterNode in the count section of the config file.

23Exercises – „Solution 1“

e.g. 07:13

base case w/ bypass

24Exercises – „Solution 1“

base case w/ bypass

e.g. 08:27

25Exercises – „Solution“ 2

2. a) e.g., Mendrisio

26Exercises – „Solution“ 2

2. b) e.g., Rosengartenstrasse

27Exercises – „Solution“ 2

2. c) Boundary of modeling area

→ Task nbr 3!

28Exercises – „Solution“ 3

network.xml<link id="95214" from="156384139" to="300386714" … />

<link id="95215" from="300386714" to="156384136" … />

<param name="distanceFilter" value= "10000" />

<param name="distanceFilterCenterNode" value= "300386714" />