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TRANSCRIPT
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PAPERREF#8005
Proceedings:EighthInternationalSpaceSyntaxSymposium
EditedbyM.Greene,J.ReyesandA.Castro.SantiagodeChile:PUC,2012.
8005:1
DEGREESOFSUSTAINABLELOCATIONOFRAILWAY
STATIONS:IntegratingSpaceSyntaxandnodeplacevalue
modelonrailwaystationsintheprovinceofNorth
Hollandsstrategic
plan
for
2010
2040
AUTHOR: AkkeliesvanNES
DepartmentofUrbanism,FacultyofArchitecture,DelftUniversityofTechnology,Netherlands
email:[email protected]
EgbertSTOLK
DepartmentofUrbanism,FacultyofArchitecture,DelftUniversityofTechnology,Netherlands
email:[email protected]
KEYWORDS: RailwayStation,Accessibility,NodePlaceValueModel,Sustainability
THEME: MethodologicalDevelopmentandModeling
Abstract
Mobilityonrailsisacknowledgedtobeoneofthemostsustainablemeansoftransportationbetweencities
and towns.Therefore,a railway stations location inabuiltenvironmentand itsdegreeofaccessibility is
essentialtoreachasmanytravellersaspossible.Eventhoughthereexistseveralwritingsonnetworkcities
andTODprinciplesconcerningrailaccessibilitytourbancentresandsubsentres,thespatialconfigurationof
the local streetand roadnetwork ina railway stations vicinity is seldom taken into consideration in the
discussionon
railway
transport.
Therefore,
two
different
analyses
methods
were
used
with
purpose
to
identify the degree of regional and local interaccessibility of all train stations in theprovince of North
Holland in the Netherlands. The space syntax method provided measurements on a street nets inter
accessibilityondifferentscalelevels,whiletheNodePlacemodelanalysesprovidedthedegreeofastations
attractiveness intermsofplacevalueandmeansoftransportationvalue.Astheresultsshow,correlations
werefoundbetweenastationsdegreeof localandregionalaccessibilityandfrequencyofthetimetables.
When implementing and improving sustainablemeans ofpublic transportation, urbanfunctions such as
dwellings,shops,services,workshopsandofficeshavetobeinshortwalkingdistancesfromstationsandthe
streetnetworkmustbeeasilyunderstandableforwayfinding.Theresultsfromthis inquirywereapplied in
theprovincespolicyplanasaprioritylistforstationimprovementsintermsofdegreeoflocalaccessibility.
Moreover,theprioritylistoftheimplementationofnewhousingareaswasmadeonbasisonthedegreeof
localand
regional
accessibility
to
existing
railway
stations.
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1.INTRODUCTION
Interaccessibility is acknowledged in regional planning to be an important socioeconomic indicator
influencingseveraldecisionsconcerninglanduseandinfrastructuralplanning.Ithasbeenwelldocumented
that car dependence gives impacts on the environment, urban social life and economic investment and
development.Themoreprivatecardependentacityis,themoreofthewealthofitsinhabitantsisspenton
gettingaround
(Newman
&
Kenworthy
1999).
Conversely,
the
more
acity
spend
on
public
transport,
the
more itsavesspaceandthemorespace isavailable intheurbanisedareastogeneratediversificationand
intensificationwithinshortwalkingdistances for thecreativeeconomy (Hall1997and Jenks1996). Inter
accessibilitycanbeapproachedfromseveralscale levels inbuiltenvironments,fromneighbourhood level
uptolargeregions.Inthiscontext,interaccessibilitymeansthataplaceoranodecaneasilybereachedby
alargevariationofmobilitymeanswithinareasonabletraveltime.
In2008 theprovinceofNorthHolland in theNetherlandsasked two researchers fromDelftUniversityof
Technology,FacultyofArchitecturetocarryoutspacesyntaxanalysesoftheroadandstreetnetworkinthe
wholeprovince.Thepurposewastousetheseanalyses inthenewstrategicplanforthenext30yearsfor
theprovince.
TheNetherlandshas,incomparisonwithotherEuropeancountries,ahighdensityoftherailnetwork.Trains
arerunningfrequently,andevenseveralsmallvillagesareconnectedtotherailnetwork.TheDutchcapital
cityAmsterdamandSchipholinternationalairportarebothlocatedinprovinceofNorthHolland.Intotalthe
provincehasanareaof2670km2,and2.613.992peopleareatpresentlivingintheprovince(Structuurvisie
2008). The density is 979 inhabitants pr km2.Most of the urbanised areas are aroundAmsterdam and
Haarlem,whiletheruralareasareintheprovincesnorthernparts.
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Figure1:MapofprovinceofNorthHolland.
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Intotalthereare57railwaystations intheprovince.Theyvary from largermetropolitanrailwaystations,
airportstations, intermodalhubstations, small local stationswithonebuildingalong rail tracks, tojusta
trackwitha ticketmachinealong the rails.A strategicplan for the railwaynetwork is important for the
province. It isacknowledgedtobe thebestway forsolving the trafficcongestionsproblems intheurban
areasinsideandaroundAmsterdam(Structuurvisie2008).Moreover,therailnetworkhastointerconnect
theremoteareastothelargercitieswithfrequentlyrunningtrains.Inparticulartherailnetworkalsohasto
servepeoplewhocanordonottravelbycar.
It is often believed that a railway station attracts economic activities such as shops, retail and offices.
However, the spatial configuration of the local street and road network in a railway stations vicinity is
seldomtaken intoconsideration(MuldersKusumo2005).Somestationsareeasilyaccessiblebyfootorby
publictransport,whileotherscanonlybereachedbyprivatecar.Thereforethenextquestionistofindout
how sustainable thepublic transportnetwork is in theprovince in termsof thedegreeofaccessibilityof
railwaystationstothebuiltenvironmentonvariousscalelevels.Firstareviewofwritingsonrailwaystations
andbuiltenvironmentswillbegiven.The literatureaboutrailwaystationsandurbandevelopmentcanbe
groupedintwogroups.Oneisabouttheroleoftherailwaystationitselfanditssurroundings,andtheother
isabouttheroleofthemobilitynetworkinalargemetropolitancontext.Thediscussionisbrought in light
withthecompactcitydebate.Thenthemethodsappliedinthecasestudieswillbedescribed.Thenthecase
studiesarepresentedandfinallytheapplicationoftheresultsinstrategicplanningwillbediscussed.
2.THERAILWAYSTATION,ITSVICINITYANDSUSTAINABLEDEVELOPMENT
Railwaystationsarepointsoftransportinterchangewherethedepartureandarrivalactivitiestakeplace.In
essence,thestation isaspacebetweenaparticularplaceandthetrains(Edwards1997,p.173).Arailway
station isapublicplacewithapublic facade to the city,open foreveryone.Atpresent, railway stations
perform a variety of functions. First of all, they are places where people change from trains to the
pavement,
to
subways,
buses
or
cars,
to
a
bicycle,
a
taxi,
the
light
rail,
to
other
trains,
or
to
airplanes.
Otherwise they simply arrive at their final destination,which is in the immediate vicinity of the railway
station. Furthermore, train stations are also shoppingmalls,meeting places and urban landmarks. The
passengers station is the architecturalmanifestation of the railway system and its connectionwith the
urbanfabric.Itisbothagatewaytoarailnetworkanditisathresholdforpassengersenteringacity.What
givestherailwaystationparticularsignificanceasarchitectureandessentialelementsinthelifeandcultures
ofcitiesispreciselythisinterfacebetweenthesetwoworlds therailwaysystemandtheurbanbackcloth
(Edwards1997,p.xi).
Afterhalfacenturyofagloballyhighemphasisonroadconstructionandanequallywidespreadneglectof
railwayinfrastructures,thelasttwodecadesweremarkedbyarenaissanceoftherailway.Duetoincreased
pollution, congestionofprivate cars in streets,ecologicalmovementsandan increasedpublic interest in
sustainabledevelopment,publictransportbyrailhasregainedattentionthe lasttwodecades.Therailway
system can be regarded as a solution for the transport problem of the cities. The ecological benefit of
travellingbytrain,combinedwithtechnicalbreakthroughsconcerningnewtypesoftrains,suchasthefast
FrenchTGVtrainsrunningat250km/h,newtypesofsuburbanlightrailsystems,andnewcombinedtypes
ofmetrosystemshasledtoanincreasedrailinvestment.Likewise,newhighspeedraillinkshavebeenbuilt
betweencitiessuchthatathroughoutmodernisationoftheoldrailwaystationsortheconstructionofnew
ones became inevitable.Onewas thus heading for a functionally smooth transport system. Basically, it
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seemsthatmodernrailwaystationsmostlyhavethesamespatialstructureasoldones.Thetexturesofthe
material,however,areslightlydifferent(Edwards1997,p.ix).Modernrailwaystationsappeartobelighter,
safer,andmorecommercialthanolderones.
Interestingly enough, stations have become important economic catalysts for urban development. Their
improvementhasleadtomassiveurbandevelopmentaroundseveralstationareas,duetothatthelocation
ofrails
is
fixed
and
last
along
time.
It
gives
acertainty
for
investment
going
beyond
the
period
that
investors
needtogettheirinvestmentback(Cervero2003).
Airportstationsand intermodalhubstations located in industrialareasarepoorlyconnected to the local
placewheretheyare located.Larger railwaystationsareplacedwithinorclosetoacitycentre.Theyare
localisedinitsdensenetworkofcentralfacilities.Itisevenmoreapartofcitylife,withasmoothtransition
from thecitystreettoaseatonthetrain (Edwards1997,p.26). Insmallertownsorvillages,therailway
stationtendtobeonebuilding locatedalongthetracks.Oftenthearchitectureofthebuildingmirrorsthe
localbuildingstyleattheplace.Thesmallesttypeofrailwaysstationconsistsofatrack locatedalongthe
railswithoneshelterfortherainandaticketmachine.Thesestationstendtobelocatedinthecountryside
orinpostwarsuburbanareas.
3.THERAILWAYSTATION,THEREGIONALSCALEANDSUSTAINABLEDEVELOPMENT
Onapolicy level,twomajorstreamsofthoughtsare identifiedonhowtodesignplacesand infrastructure
networks for generating sustainablemobilitymeans. The first one is the TransitOrientedDevelopment
(TOD)inspiredbyPeterCalthorpesbookThenextAmericanmetropolis.Theemphasisisontheroleofthe
pedestrian and the mixed usage of urban space in neighbourhood areas. Calthorpes concept of the
pedestrianpocketaccountsfortheideaofanopportunityforwalkingdistancesforallkindsofpeopletoall
activities fromhome.CalthorpeexplainsTODas follows:moderateandhighdensityhousing,alongwith
publicuses,jobs,retailandservicesareconcentratedinmixedusedevelopmentsatstrategicpoints,along
theregionaltransitsystem(Calthorpe,1993,p.41).TheTODconceptorpolicyideaisanalternativetocar
dependentsprawledreality,mostlyaprobleminAmericanbuiltenvironments(Bertolini,2006).
Theother streamsof thoughtsare the ideaofamobile networkedurban society (Bertolini,2006).This
Europeanbased thoughts conceive that a built environment is multinodal with a network that has to
accommodatetelecommunicationtechnologies,cartrafficandpublictransport.Thefocushere ismoreon
whatagenericgodcityis,ratherthansustainableurbandevelopmentasinTOD(Bertolini,2006).Thework
ofamongothersDupuy(2008)andKlaasen(Klaasen,Rooij&Schaick2007)belongstothisgroup.
Accordingtotheseauthorsthenetworkconsistsofnodesandlinks.Thenetworkconceptisdefinedinthree
layers.Theirconceptofthesocalledtopologicalcriterionreferstophysicalnetworkssuchasrail,road,and
ICTinfrastructures
located
in
space.
Their
concept
of
kinetic
criterion
refers
to
the
movement
and
communicationbetweenthenodes,basicarelationshipbetweentimeandspace:speed.Theirconceptof
adaptivecriterionconcernsthecapacityfortheevolutionofnetworksovertimeandspace(Klaasen,Rooij&
Schaick2007). The rail and roadnetwork is considered to be the carriersofurban systems. The central
aspectinthenetworkcityapproachisthatthereisaninterrelationshipbetweenthephysicalnetworks,the
functionalnetwork,and theusersof thesenetworks.AsKlaasen,RooijandSchaickstates:Basicallyone
couldsaythatitisnotlongeraboutbeingsomewherebutaboutgettingthere:designandplanningisnot
aboutplacesbutaboutplacesinconnectingwithroutes(Klaasen,Rooij&Schaick2007,p.8).
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InherPhDthesisKnowledgebaseddesign:Developingurban®ionaldesignintoascienceInaKlaasen
discussestowhatextendvariousurbanmodelsencouragecollectiveorindividualactivitiesandwhichtype
ofmodelencourageprivatecardependency.Assheclaims,thecollectivetransportcanbebestsupported
byastarshapedorthefingermodelstructuredmainroutenet.Theorthogonalgridshapedmainroute
networkgeneratesprivatecardependencyandademandforlargeparkingspaces(Klaasen,2004,p.136).
Theconcepts
used
in
the
network
city
approach,
as
describe
above,
tend
to
be
rather
abstract.
It
is
difficult
toapplytheseconceptsintoconcreteresearchprojectsaswellasstrategicplanningandurbandesign
projects.Afinermorphologicaldescriptionismissing.
Inthiswayitisdifficulttomakeadetaileddescriptionofthespatialconfigurationofthevarioustypesof
streetandroadnetworksofthenodesandthelinesconnectingthesenodes.Likewise,aspatialdescription
onamicroscalelevelismissingonhowthevariousfunctionsarelinkedtooneanotheralongatransit
system.Thechallengehereistolinktheunderstandingsofthenetworkcity,locationofactivitiesorurban
functions,andrevealtheminlightofhowtheseaspectscangeneratesustainablemobilitymeans.
During the last two decades, several authors such as Richard Rogers and Mike Jenks search for an
understandingof
the
compact
city
model,
which
is
recognised
to
encourage
sustainable
ways
of
living
and
energyuse for transportation.Generally speaking,urban sustainability is thus accounted for in termsof
compactness.AsRogerspropose,anetworkwithcompacturbancentrescansupportpublictransportwith
frequentservices(Rogers1999,p.53)
Rogers approach to urban sustainability is reinterpreting and reinventing the dense city model. It is
defined toconsistsofantizoning, increaseofenergyefficiency,consuming fewer resources,produce less
pollution and avoiding sprawling over the countryside (Rogers 1997, p. 33). Separation of functions
contributestothelossofstreetlife,encouragescaruseandcreatesnomansland.Asinglemindedspace
useisdefinedintermsofurbanspacefulfillingasinglefunction.Thedesignofresidentialareassegregated
fromworking and leisure areas exemplifies this case.According to Rogers, rigid planning standards and
controls
on
zoning,
parking
and
density
contribute
to
encourage
a
development
towards
car
dependency
(Rogers1997,p.9).Theoppositelabel,i.e.openmindedspaceuseisdefinedintermsofmultifunctional
spaceuseopenforeveryone. It ischaracteristicofthecompactcity.Anotherfeature isfineurbangrain
whichrelatestoqualitiesofmixtureandvariety(Rogers1997,p.10).
Likewise, the space syntax method has been used for describing the spatial properties of vital well
functionedcities.Theconcepturbansustainabilityhasnotbeenusedexplicitly.However,theidentification
ofthespatialparametersforgeneratinga livelywellfunctioningcitycanbefound inseveralspacesyntax
paperspresentedat symposiums and injournals.A livelyurbanarea isdefined tohavehigh locally and
globally integrated street network (Hillier et at 1993, 1998), high degree of connectivity of the street
networkwithinashortmetricaldistance(Hillier1999),andtohaveactivefrontages(vanNes&Lopez2010).
In2003
the
space
syntax
method
was
applied
on
various
urban
centres
with
purpose
to
identify
the
spatial
parametersforgeneratingsustainablemobilitymeans.Asthiscontributionconcluded,urbancompactness
canbestbeapproached fromaconfigurablepointofviewdue to thatcompactness isa topological term
(Encyclopaedia1955).Thereforeurbancompactnessconsistsinahighdensityofthestreetnetworkwithina
shortmetricaldistance (vanNes2007).As concluded in this research, it isnotenoughencouraginghigh
densityinurbanareasbyincreasingthenumberofdwellingsandlocalesforeconomicactivitiesoringeneral
highdensityofthebuiltmass.Itisalsothedensityofthestreetgridanditslocalandglobalpositioninthe
wholesystemthatareat issue.Thedegreesofconnectivityofastreetanditsconfigurationalposition ina
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city influence the relationship between inhabitants and visitors. Seemingly, urban compactness is a
necessary condition for a sustainable urbanprocess in terms ofhighdegreeof interconnectivityof the
streetgridandthewayitisconnectedtothewholecityonlocalandglobalscales(vanNes2007).
InherPhDthesis,CameliaMuldersKusumoinvestigatedtowhatextendrailwaystationsattractinvestments
andvitalshoppingareasintheirvicinity.Plannersanddesignersputalotofeffortintotransformingrailway
stationsinto
urban
areas.
However,
the
spatial
structure
of
the
local
street
the
railway
stations
are
connected to isoftennot taken into account at all. Therefore she analysed the local streetpattern and
correlatedthedegreeofspatial integrationwiththe locationpatternofshops.Ashercasestudiesshows,
stationsinitselfisnotenoughtoattractshopsandinvestmentinthevicinity.Alocalareasdegreeofvitality
hastobespatiallysupportedbya localwellconnectedand integratedstreetandroadnetwork(Mulders
Kusumo,2005).
Sheapplied the traditionalspacesyntaxmethod,whereonly thenumberofdirectionchanges fromeach
streettoallothersistakenintoaccount.However,duringthelastthreeyearsnewmethodologicalaswellas
software development has taken metric and geometric distance into account. These new spatial
measurementsandtoolsmake itpossibletoanalyse largermetropolitanareaswithmorediversityonthe
typesof
spatial
analyses
than
in
the
past.
Asindicatedfromtheliteraturereview,thespatialconditionsofasustainableurbandevelopmentseemsto
beacompactcitywithaninteraccessiblestreetandroadnetworkthathaveaspatialstructuregenerating
sustainablemobilitymeans.Adefinitionofinteraccessibilityinthiscontextimpliesthattherailwaystation
isembeddedorwellconnectedto itsvicinitysstreetand roadnetworkandthat thevariousservicesare
easilyaccessible from the railway station.Moreover, the frequenciesofpublic transport servicesand the
mixtureofurbanfunctions(suchasdwellings,offices,shopsandleisureactivities)hastobehigh.
4.THENODEPLACEVALUEMETHODANDTHESPACESYNTAXMETHOD
Twomethodswereusedtoinvestigatethecorrelationbetweenastreetnetsdegreeofspatial integration
andthevalueofarailwaystation,thespacesyntaxmethodandtheNodePlacevaluemodel.
TheNodePlacevaluemodel,developedbyLucaBertolini,aimsatcorrelatingthedegreeoffunctionalityand
degreeof localplacequalitiesfornodes (Bertolini1999).Accordingtothismodel,astation functionswell
whenthenodevalueandtheplacevaluecorrespond.Theparametersfordecidingthenodevaluearethe
variationinthemobilitytypes,thefrequencyofthepublictransportsystemofahub,theaccessibilityofthe
network connected to thenode, and thenumberofmobilitymeans that can reach thehub.Thehigher
variationofmobilitymeansand thehigher frequencieson the time tablesduringaday, thehighernode
value. The parameters for the place value are dependent on the number of functions accessible in the
vicinityof
the
node,
such
as
dwellings,
offices,
public
buildings,
leisure
activities
and
shops
and
the
way
these functionsareconnected toeachother.Thehighernumberof functionsandserviceswithinashort
walkingdistancefromastation,thehigherplacevalue.AccordingtoBertolini,amonofunctionalnodewith
forexampleonlyofficeshasa lowdegreeofplacevaluethananodewithdwellingsandoffices (Bertolini
1999).
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Figure2:Degreesofbalancebetweenanodevalueandaplacevalue(Bertolini1999)
TheNodePlace valuemodel illustrates therefore theoptimal correlationbetweenplace value andnode
value.When there is abalancebetween this correlation it isdefined tobe a successfulnode andplace
(figure2).Oftenrailwaystationslocatedinthesekindsofplacestendtobesuccessful.Assoonaseitherthe
placevalueorthenodevalue isdominating,theseplacesaredefinednottobesuccessful fornodes.The
modelhasbeentestedonstationareas in theprovinceofNorthHollandbyGertonPieters (figure3).He
usedthefollowingfourcategoriesfortheclassificationoftheplaceandnodevalueofarailwaystation:(1)
largeurbancentrenode,(2)transfernode,(3)regionalnode,and(4)localnode.Thenextstepistocompare
theseresultswithspacesyntaxanalysesoftheroadandstreetnetworkofthewholeprovince.
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Figure3:GertonPietersanalysisofstationsinProvinceofNorthHolland(Source:NorthHolland2009)
Theaimwithusingthespacesyntaxmethodistogetinsightsonhowthespatialstructureofthestreetand
roadnetworkinastationsvicinityrelatestothestationsplaceandnodevalue.Thespacesyntaxmethodis
abletocalculatehowastreetrelatestoallothers inatownorcity.TherecentversionsoftheDepthmap
softwareareabletocalculatetopologicaldistance(howintegratedastreetisinrelationshiptoallothersin
termsof
the
number
of
direction
change),
geometrical
distance
(how
integrated
astreet
is
in
relationship
to
allothersintermsoftheangularrelationshipbetweenthem),andmetricaldistance(Hillieretal2007).
Whenanalysinglargesettlements,recentsoftwaredevelopmenthavemadeitpossibletoanalysehoweach
streetrelatestoallothers insettlementswithmorethanhundredthousandstreetsegments.Asresearch
has shown, there are correlations between a built environments spatial layout of its street and road
networkandthelocationofeconomicactivities,crimedispersal,landusealongstreets,andpropertyvalues
(Hillieretal1998).Thereforethedegreeofspatialintegrationaffectsmobilityflowrates.Moreover,italso
affectsthe locationofvariouseconomicactivitiessuchas firmsandshops (Hillieretal1993,1998). Ifthe
structureofthestreetandroadnetworkchanges,themobility flowandthe locationpatternofeconomic
activitiesareaffected(vanNes2002). Inthisrespect,astationoranodesplacevaluecanbequantitative
measuredonthevariousdegreesofspatial integrationofthestreetandroadnet.Thespatialparameters
canbecorrelatedwiththesocialandtechnicalparametersindicatedintheNodePlacevaluemodel.
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Figure4:GlobalaxialintegrationanalysisofthestreetandroadnetworkinNorthHolland.
5.ANEWTYPOLOGYOFRAILWAYSTATIONSINTHEPROVINCEOFNORTHHOLLAND
Figure4showsaglobalaxial integrationanalysisoftheroadandstreetnetwork inthewholeprovinceof
NorthHolland.Theredandorangelinesrepresentthespatialmostintegratedareasintermsofthefewest
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numberofturns.Themorebluethelinesget,themorespatialsegregatedthestreetsare.Inordertoreduce
the edge effect of the global axial analyses,we added the Rijland region to the axialmap. This region
belongstoanotherprovince(ProvinceSouthHolland).However,dueto itsstrongconnectionstoSchiphol
AirportandAmsterdam,itisadded.
Ascanbeseenonthemap,theareasaroundAmsterdamsringroadarethemost integratedareas inthe
province.There
most
of
the
international
companies
and
advanced
producer
services
(APS)
are
located.
The
northernareasarethemostsegregatedones,coloured inblue.Theseareasaredominatedbyagricultural
production,consistofsomesmallvillagesandhaveaslightstagnationinthepopulationgrowth.Withother
words,theglobal integrationmapshowsthetomovementpotentialsonaprovincialscale level.Hence,
thespatialpotentialsforthelocationoflargebusinesscentres,largescaleindustrialactivities,megamallsor
carbasedshoppingcentresareindicated.
Onalocalscalelevel,figure5showsalocalangularintegrationanalysisofthewholeprovince.Theangular
analysis is segmentbased and the local radius is three timesdirection changes. The various localurban
centres are highlighted in red and yellow, in particular the main streets andmain routes through and
betweenurban areas. Therefore themap shows the throughmovementpotentialson a local scale. It
showsthe
spatial
potentialities
for
the
local
urban
centres.
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Figure5:Localangularsegmentanalysiswithatopologicalradius3ofthestreetandroadnetworkintheprovinceofNorthHolland
Whenapplyingvariousmetricalradiusesontheangularchoice integrationvalues,thedegreeofvitalityof
variousnodesorcentresishighlightedonvariousscalelevels.Anangularchoiceanalysiswithalowmetrical
radiushighlightstheoldhistoriccentres. Inthepastthesecentreswereplannedtobe interaccessiblefor
pedestrianmovement.A highmetrical radius highlights themodernurban centres and themain routes
network.Figure6showsanangularchoice integrationanalysiswithametricalradiusof800units.Ascan
bee seen in the figure, themain streets in the historical core ofAmsterdam,Haarlem andAlkmaar are
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highlighted inredcolours.Likewise,allthesmalltownandvillagecentresarehighlighted in lightblueand
yellowcolours.Thesestreetsarefrequentedbypedestriansandhavetheliveliestshoppingstreets.
Figure6:Angularchoiceanalysis(segment)witharadiusof800metricalunitsofthestreetandroadnetworkinNorthHolland
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Figure7showstheangularchoiceintegrationanalysisoftheprovincewithametricalradiusof9000units.
Theregionalmaincentresarehighlighted.InAmsterdamthesestreetsareaccessiblebytram,bussesaswell
asprivatecars.Oftenthemainrailwaystationsare inthevicinityofthesecentres.Ascanbeseenonthe
map,themaincentresareAmsterdam,followedbyHaarlemandAlkmaar.
The locationofall railway stationsaccording to the typologypresentedbyGertonPieters (NorthHolland
2009)can
now
be
correlated
with
the
results
from
the
spatial
analyses.
The
degree
of
potentialities
and
obstacles fordevelopmentaround stationareascanbe revealed.These results canbeuseful formaking
prioritiesofthedevelopmentofstationareas. Inparticularthecombinationofthesetwomethodsshows
the degree of accessibility and vitality on various scale levels. But first the identification of the spatial
parametersofwhatasustainabletrainstationiswillbediscussedforeachtypeofrailwaystation.
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Figure7:Angularchoiceanalysis(segment)witharadiusof9000metricalunitsofthestreetandroadnetworkinNorthHolland.
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Figure8:Thedegreeofaccessibilityonvariousscalelevelsatonerailwaystation.
Intermsofthedegreeofaccessibilityofanode(anodesspatialprofile),fivetypesofrailwaystationsare
indicatedbasedonthespacesyntaxanalysesandthenodeplacevalueclassification;(1)Wellconnectedon
all scale levels, (2)Regionalwellconnected, locally isolated (3)Wellconnectedon town level,butpoorly
accessible for pedestrians, (4) Locally wellconnected, poorly connected on regional level, (5) Poorly
connectedonall scale levels.Themethod for theclassification isbasedon the spacesyntaxanalyses for
eachstation,asshowninfigure8.
Asitturnsout,astationsdegreeofnodeandplacevaluedependsonthespatialconfigurationofthestreet
androadnetinitsvicinity.Thestationsdefinedasbeingalargeurbancentrenodewithbothhighnodeand
place valueshave a street and roadnetworkwellintegratedonall scale levels. Stationswithhighplace
value, but low node value tend to have a street network that are highly locally integrated but poorly
integratedon regional level.Conversely, stationswithahighnodevalue,but lowplacevalue tend tobe
located inmonofunctionalareaswitharegional integratedstreetandroadnetwork.The local integration
onthestreetandroadnetwork is low.Stationswithbotha lownodeandplacevaluetendtohavebotha
lowintegrationonitssurroundedstreetandroadnetworkonlocalaswellasregionallevel.
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Figure9:Thelocationofvarioustypesofrailwaystations.
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Figure9showsthe locationofthetypologiesofallrailwaystations inprovinceofNorthHolland.Thewell
connectedrailwaystationsonallscale levels(type1)arethecentralstationsofAmsterdam,Haarlemand
Alkmaar.Thesestationsareeasilyaccessibleonaprovinciallevelaswellasforpedestriansfrequentingthe
stationsvicinityinsideoradjacenttothecityandtowncentres.
Thereisabalancebetweentheplaceandthenodevalueinthevicinityofatype1railwaystation.According
tothe
Node
Place
value
model,
there
tend
to
be
high
pressure
on
the
land
in
the
vicinity
of
these
kinds
of
stations. Therefore, the location of a main railway station contributes to sustainable means of
transportation inthesekindsofareas.Thesestationsareasplacevalue isveryhighduetoa largemixof
functionssuchasoffices,shops,services,dwellings,cafsandrestaurants inthevicinityofthesekindsof
railwaystations.Likewise,thedensityofthebuiltmassishighintermsofagoodbalancebetweenhighfloor
space index(FSI)andgroundspace index (GSI) (HauptandBerghauserPont,2010).Thesestationshavea
highnodevalueduetoahighfrequencyofalltypesoftrains(intercityandlocaltrains)andbussesortrams
departingfromthem.Sincethesestationsarewellconnectedtotheregionalaswellasthe localnetwork
andhaveahighvariationof sustainablemobilitymeans (train, trams,busses,bicycleetc), these stations
havethemostsustainablelocation.Oftenstreetsintheirvicinityaredifficulttoaccessbytheprivatecardue
totrafficregulations,inwhichforcepeopletousethepublictransportorthebicycle.
The regional wellconnected stations with poor pedestrian accessibility in the vicinity (type 2) are the
Schipholairporttrainstation,andstationsinindustrialareas.ExamplesontheseareHoofddorp,Sloterdijk,
AlkmaarNoordandDiemen.Thevicinityofthesestations isnotpedestrianfriendlyandthesestationsare
mostly transferstations.Oftenofficeswithgoodparking facilitiescanbe found in thesestationsvicinity.
TheseareastendtohavelowGSIbutsometimesahighFSIontheirbuiltmass.Thesestationstendtobeon
anunbalancednode.Theplacevalue is lowbecausethenode ismonofunctional. Intermsofnodevalue,
the frequencyof trainsdeparting from these stations tend tobe relativelyhigh. Some stationsarewell
connectedtothelocalbusnet.
The trainstationsaccessibleonacityor townscale level,butwith lowdegreeofpedestrianaccessibility
(type3)
are
the
train
stations
located
on
the
edges
of
settlements.
In
particular
railway
stations
in
the
vicinityoflargethroughoutplanneddwellingareasfromthe60s,70sand80swithahighdegreeofprivate
car dependency belong to this type. Examples on railway stations of this kind areAmsterdam Lelylaan,
Beverwijk, Nieuw Vennep and Castricum. Often local centres can be found on only one side of these
stations,ortheydonothaveanycentresatall.TheseareastendtohavealowGSIandmediumtohighFSI
ontheirbuiltmass.Alargepartofthesestationsareaslandsurfaceisdominatedbyroadsandparkinglots.
Duetothatthereisamixoffunctionsinthestationsvicinity,theplacevalueishigh,butthenodevalueis
lowduetothatonlylocaltrainsdepartfromthesestations.Thereforethenodeplacevalue isunbalanced.
The challenge here is to encourage an urban development with a locally integrated street network
generatinganaturemixoffunctions.
Thelocally
well
connected,
but
poorly
connected
on
regional
level
railway
stations
(type
4)
are
often
located
in the town centres in the provinces edges. Examples on this are the railway stations in Den Helder,
Hilversum and Enkhuizen. These towns have a small historic centrewhere the railway station is easily
accessiblebyfoot.Localvitalshoppingstreetsandprovisionofservicesare inshortwalkingdistancefrom
thesestations.Thedensityof thebuiltmass ismediumtohigh in termsofagoodbalancebetweenhigh
floorspace index(FSI)andgroundspace index(GSI).Likewise,thesestationareashaveagoodbalanceon
theirplaceandnode value in termsofabalancedmixof functionsand thatboth local trains and some
intercitytrainsdepartsfromthesestations.Someofthemareinterchangepointstoalocalbusnet.
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Finally,therailwaystationswithpoorconnectionstothestreetnetworkonallscalelevels(type5)tendto
havearemotelocation.Thesestationscanonlybereachedbycarandthestreetandroadnetworkintheir
directvicinitydonotgeneratepedestrianmovement.ExamplesonthesekindsofstationsareDenHelder
Zuid,WeespandNaardenBussum.Therearenoservices in thevicinityandtheseareashave lowFSIand
GSI. The node value is low due to that these areas are either dwelling areas or local industrial areas.
Likewise,theplacevalueislowintermsoflowfrequenciesoflocaltrainsdepartingfromthesestations.
Astheanalysesshows,Amsterdamisthemostvitalcentreintheprovinceonallscalelevels.However,the
centreofHaarlemhasaveryhighlocalintegrationcombinedwitharelativehighregionalintegration.Itcan
bemirroredinthevariationofshopsinthesecentres.InHaarlemcentrethereisamuchlargervariationin
typesofshopswithinashortmetricaldistancethan inAmsterdamcentre. InAmsterdamthechoicesand
variationsofshopsarelargerthaninHaarlem,buttheyarespreadoveralargemetricalradius.Conversely,
theprovincesareasinthenorthhavelowlocalandregional integration.Theseareasarepoorlyaccessible
byrailandpublictransport.Someofthelocalcentresinthevillageshavehighlocalintegrationonthestreet
networkandareknowntobepedestrianfriendlyareas.
Whatare then the spatialconditions fora sustainable locationofa railway station?Firstofall,a railway
stationlocated
directly
to
acity
centre
or
town
centre
that
have
ahighly
integrated
road
and
street
network
on various scale levels has themost sustainable ones. As regards the theory of the naturalmovement
economic process, streetwith high spatial integration on various scale levels tend to have high human
movementflowratesaswellashighconcentrationofservices(Hillieretal1993,1998).Moreover,streets
withbothgloballyand locallyhighangularchoice integrationvalueswithin shortmetricaldistanceshave
highvariationoffunctionsandhighdensityofthebuiltmass(vanNes,BerghauserPont,Mashhoodi2011).
Sincethesekindsofurbanareasattracthumanmovementtowardsthem,arailwaystationeasilyaccessible
tothemcanstimulatetransportonrailratherthanprivatecaruse.Whencomparingtheresults fromthe
spacesyntaxanalyseswiththenodeplacevalueanalysis,stationswithahighlocalintegrationonthestreet
grid in their vicinity tend tohaveagoodbalancebetween theplaceandnode value.There isabalance
between the timetables, frequencies,degreeofmultifunctionality in landuse,andservicesand facilities
provided.The
higher
global
integration
values,
combined
with
high
local
integration
values,
the
more
pressure there ison thearea. In thesecases, theneedofa railway stationwithhigh frequencieson the
timetablescancontributetosustainablemeansofmobilitytoplaceswithahighaccessibilitydemand.
6. THE APPLICATION OF THE RESEARCH RESULTS IN THE STRATEGIC PLAN OF PROVINCE OF NORTH
HOLLAND
The classification of the various railway stations based on their location in the province is usefulwhen
makingapriority listofsustainabledevelopmentofnewhousingareas.Intheprovincesstrategicplanfor
thenext30yearssomeareasareproposedforfacilitatingfutureurbanexpansionmostlyontheprovision
of new dwellings. The province hasmade amap of potential future location of new dwelling areas for
facilitating living in thecountrysideor in thenatureareas.According to the recentnationalspatialpolicy
document(MinisteriesvanVROM2006),thereisademandforthisdwellingtype.Therefore,incomparison
withearliernationalpolicydocuments,thegovernmentandtheprovincesaimatchoosinglandfacilitatinga
developmentofthiskind.However,newhousingareasofthiskindtendtogenerateprivatecardependency
and to contribute to urban sprawl into the countryside. It is therefore worth revealing the degree of
sustainabilityof theprovincesproposedhousingareas in termsofmobilitymeans.Theaim is tomakea
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classificationandaprioritylistoftheseproposedhousingareasbasedontherailwaystationanalyseswith
thespacesyntaxmethodandthePlaceNodeValuemodel.
Theseproposednewdwellingareaswerecorrelatedwiththe fourspacesyntaxmapsandcombinedwith
theabovepresentedvarioustypesofrailwaystations.Theaimwastoinvestigatewhatkindoflocal,regional
and provincial accessibility these proposed new dwelling areas have. In particular the degree of spatial
integrationand
hence
the
degree
of
vitality
of
the
existing
local
centres
street
network
were
taken
into
account. Inthisway,thesedwellingareaswereclassifiedaccordingtohowtheycontributetosustainable
meansofmobility,thetypeofeventualarailwaystationinthevicinity,andtowhatextendtheseproposed
newareasgenerateurbansprawl into thecountryside.Thedwellingareaswereclassified in sixdifferent
groupsaccordingtotheirlocationintermsofgeneratingsustainablemeansofmobilityanddegreeofvitality
oftheexistingstreetandroadnetworkinthedirectvicinity.Figure10showsthelocationsoftheproposed
newdwellingareaswiththeirclassificationletters.
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Figure10:Thelocationoftheprovincesproposalofnewdwellingareas.
TypeAispoorlyconnectedtotheexistingurbanareas,hasnorailwaystationandispoorlyaccessibletothe
highway net. Implementing dwellings in these areas contribute to sprawl into the countryside and high
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degreeofprivate cardependency,whichconflictswith theKyotoagreement.Theareasbelongingunder
typeAarelocatedattheedgesoftheprovince,withnoconnectionstoexistingtownsorvillages.
TypeBareasarecloselylocatedtotheexistingsmallvillages.Thelocalaccessibilityishighandcanstimulate
movementby footorbike for the localmovement.The regionalaccessibility ison theotherhand low in
termsof lowdegreeofspatial integrationof thestreetand roadnetworkanda lackofa railwaystation.
Proposeddwelling
areas
of
this
kind
can
be
supportive
to
the
existing
small
village
centres.
It
all
depends
howthedegreeofspatialintegrationofthelocalstreetnetworkwillbeonalocalscaleinthesenewareas.
TypeCareasarefillinnareasbetweentheexistingurbanisationpatterns.Theseareashaveahighdegree
ofregionalaswellaslocalaccessibilityoftheexistingstreetandroadnet.Theseareasaredefinedtobethe
most sustainable proposals for urban expansion, since the existing road, street and rail infrastructure is
presentinthedirectvicinity.Inadditionthesekindsofdwellingareasgivesextrasupportforthesurvivalof
existingadjacentlocalurbancentresandtogetahighamountofpeopleusingtheexistingrailnetwork.
The type D areas are located along the highly integrated regional road and rail network. They are not
connectedtoanyexistingvillages,townsorcitycentres.Thechallengeinthedevelopmentoftheseareasis
toprovide
them
with
anew
well
connected
local
street
network
with
high
degree
of
spatial
integration
withinashortmetricaldistanceforgeneratingamixoffunctions.Thebestsolutionistomakeanewtown
withalocallyintegratedstreetnetworkintheseproposedareas.
ThetypeEareasarelocatedadjacenttolargertownsandcitiesandarewellconnectedtotheregionalrail
androadnetwork.Inordertoavoidspatiallysegregatedsleepingsuburbs, itis importantthattheseareas
localstreetnetworkiswellconnectedtothemainroutesthroughandbetweenurbanareas.Inaddition,the
newlocalcentreswiththenecessaryfacilitiesneedstobeonthesemainroutes.Inthiswaytheseareascan
benefitfromthepotentialextensionoftheexistingtramandrailnetwork.
ThetypeFareasarethespecificcasesnotbelongingtoanyoftheseotherabovementionedtypes.These
areas have to be treated individually, depending on their specific local context of the street and road
networkandthedegreeofadjacencyofarailwaystation.
Ascanbeconcluded,theproposed locations fornewhousingareasbelongingundertypeCgenerate the
mostsustainablemeansofmobility.Thereforeurbanexpansionshouldtakeplacefirstintheseareas.These
areas have the potentials for becoming vital local communities and to generate an optimal use of the
existingmobility infrastructure and localurbanpedestrian friendly shopping areas. These areashashigh
localaswellasregionalspatialintegration,theyareadjacenttoexistingcentres,andgeneratespedestrian
activitiesandusagesofpublictransport.TypeDexpansions isonthesecondplace,typeE isonthethird
place,andtypeBisontheforthplace.TypeAexpansionsshouldbeavoided,sinceitgeneratesurbansprawl
andprivatecardependency.
7.THESPATIALPARAMETERSFORGENERATINGSUSTAINABLEMOBILITYMEANS
Attheresultsfromthisinquiryshow,thespatialconfigurationofthelocalstreetandroadnetworkmatters
forthedegreeofsustainablemobilitymeansaroundstationsareas.Highangularchoice integrationvalues
withbothahighandlowmetricalradiigeneratemultifunctionalurbanareaswithhighvariationofmobility
means(walking,bicycling,tram,bus,lightrail,trainetc)andhighfrequenciesontimetables.
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Itiswellknownthatsuccessfulrailwaystationswithhighfrequenciesofservicesandtimetableshavehigh
numberofpeople(inhabitants,commutersandvisitors)usingit.Itisdependentonhighnumberofservices,
functions(suchasjobs,shops,amenities,dwellings,andoffices)initsvicinity,highdensityofthebuiltmass
(FSIandGSI),andhigh variationof stepoverpossibilities toothermobilitymeans (bicycle, tram,metro,
lightrail,bus,walking, taxiand car)withina shortmetricaldistance.However,diversityand frequencies
seemstodependonthespatialconfigurationofthestreetandroadnetworkinastationsvicinity.
Mainrailwaystations in largetownsandcitieshavehigh localandaswellasregionalinteraccessibilityon
thespatialconfigurationofthestreetandroadnetwork,whilerailwaystationsinsmallertownsandvillages
havemostlyhighdegreeof localaccessibility.Thesetwostationtypeshave incommontohave livelyand
vitalstreetsintheirvicinity.Thereisabalancebetweentonodeandtheplacevalue.Seemingly,thedegree
ofbalancebetweenplaceandnodevalueisdependentonthespatialconfigurationofthestreetnetworkin
termsofhighlocalangularchoiceintegrationwithinashortaswellaslargemetricaldistance.
Stations with high regional accessibility and low local accessibility are transfer stations such as airport
stationsorindustrialareaswheretwoormoremajorrailwaylinesareintersection.Inthesestationsvicinity,
the street networks spatial structure is only suitable for vehicle transport and these areas are not
pedestrianfriendly.
They
are
unbalanced
nodes.
Train
stations
with
both
alow
regional
and
local
integration
valueson the street and roadnetwork in their vicinity are located in remote areaswithhighdegreeof
privatecardependency.Thesestationshavealowfrequencyoftraindepartures,littlevariationinmobility
means,andtheirsurroundingsaremonofunctional.Theyareunbalancedplaces.
Correlationswerealsofoundbetweenthefrequencyofthetimetablesandastationsdegreeofaccessibility
to itsvicinity.Themoreregionalaswellas localastationisspatiallyconnectedto its localstreetandroad
network, the higher frequencies of the timetables. Accessibility to potential train travellers is therefore
essentialforgettingthecriticalnumberofpopulationforusingtherailnetwork.
Thevarioustypesofstationareasanddwellingareasrequiredifferentstrategiesforgeneratingsustainable
means
of
mobility
in
the
planning
and
urban
design
practice.
For
example
a
station
and
a
proposed
housing
areawitha strong regionalaccessibilitycanbe sustainableona localscale level through implementinga
wellconnected and integrated local street net. However, not every type of station area and proposed
housingareacanbeimprovedupon.Atleast,fromasustainabilityperspective,thetwomethodsappliedin
this inquirycontributetomakeapriority listofurbantasks intheprovincialplans.Likewise,thisapproach
shedssome lightonrealisticandeffective investmentstrategies. Itshowsthespatialpotentialsaswellas
constraintsinthevariousstationsvicinities.
Railwaystationsseemtobeadirectproductofthetransportationmodesofthesociety.Newtechnology
relating to new kinds of trains or to public transportation in generalmight come about in due course.
Developmentsofthissortwillprobablysetnewclaimsonrailwaystations.Butuntilnow,asustainablewell
functioningstationgeneratingsustainablemeansofmobility,dependsonbeingwellconnectedtothestreet
networkinitsdirectvicinity.Itencouragesalargeamountofpeopletouserailtransportinsteadofprivate
caruse.Suchbasicqualitiesdonotonlydependon thenumberof shops, tracks, railwaycompanies, the
density of the builtmass, and on the size of the piece of architecture inwhich they figure. The spatial
structureofthestreetandroadnetworkonvariousscalelevelsinthevicinityplaysalsoasignificantrolein
generatingsustainablemeansofmobility.
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