cutini & rabino - input2012
DESCRIPTION
Valerio Cutini and Giovanni Rabino on "The urban growth: development, sprawl and spatial configuration"TRANSCRIPT
The urban
growth
Valerio Cutini
Giovanni Rabino
Development,
sprawl and spatial configuration
growth
Seventh International Conference on Informatics and Urban and Regional Planning
Cagliari, 10-12 May 2012
IntroductionIntroduction
Contents
The configurational approach, in shortThe configurational approach, in short
valerio cutini
giovanni rabino
IntroductionIntroduction
The configurational approach, in shortThe configurational approach, in short
Urban development and configurationUrban development and configuration
Some case studiesSome case studies
ConclusionsConclusions
Would you draw a city?valerio cutini
giovanni rabino
Our thesis
The connections are assumed as the primary
raison d’etre of the city
The connections are assumed as the primary
raison d’etre of the city
The relation between the activities and the
urban grid is its actual making mechanism
The relation between the activities and the
urban grid is its actual making mechanism
valerio cutini
giovanni rabino
The connections are to be assumed as the
primary raison d’etre of the city
The connections are to be assumed as the
primary raison d’etre of the city
The relation between the activities and the
urban grid is its actual making mechanism
The relation between the activities and the
urban grid is its actual making mechanism
The genesis of an urban grid appear to follow
some constant and recurring dynamics, which
materialize in its spatial relations
The genesis of an urban grid appear to follow
some constant and recurring dynamics, which
materialize in its spatial relations
Such dynamics can be revealed by
means of a configurational approach
The genesis of an urban grid appears to follow
some constant and recurring dynamics, which
materialize in its spatial relations
The genesis of an urban grid appears to follow
some constant and recurring dynamics, which
materialize in its spatial relations
In a configurational approach, as focused on the
relations between spatial elements, any
geometric and morphologic feature vanishes
In a configurational approach, as focused on the
relations between spatial elements, any
geometric and morphologic feature vanishes
Configuration and morphologyvalerio cutini
giovanni rabino
Lorini
Scamozzi
graphsystem
IntroductionIntroduction
Contents
The configurational approach, in shortThe configurational approach, in short
valerio cutini
giovanni rabino
The configurational approach, in shortThe configurational approach, in short
Some case studiesSome case studies
Urban development and configurationUrban development and configuration
ConclusionsConclusions
The configurational approachvalerio cutini
giovanni rabino
Three assumptions can be recognized at the root of
the configurational approach to the analysis of
urban settlements
Three assumptions can be recognized at the root of
the configurational approach to the analysis of
urban settlements
The decisive influence of urban structure on the The decisive influence of urban structure on the The decisive influence of urban structure on the The decisive influence of urban structure on the The decisive influence of urban structure on the
phenomena occurring inside
The decisive influence of urban structure on the
phenomena occurring inside
The importance of the perceptive appraisal of
space in the behavioural choices of its users
The importance of the perceptive appraisal of
space in the behavioural choices of its users
The assumption of the urban grid as the primary
element of the urban structure
The assumption of the urban grid as the primary
element of the urban structure
The decisive influence of urban structure on the
phenomena occurring inside
The decisive influence of urban structure on the
phenomena occurring inside
The importance of the perceptive appraisal of
space in the behavioural choices of its users
The importance of the perceptive appraisal of
space in the behavioural choices of its users
The configurational analysisvalerio cutini
giovanni rabino
The configurational analysis of an urban settlement
can be summarized as follows
The configurational analysis of an urban settlement
can be summarized as follows
Definition of the urban gridDefinition of the urban grid
Reduction of the urban grid into a system of Reduction of the urban grid into a system of
Definition of the urban gridDefinition of the urban grid
Reduction of the urban grid into a system of Reduction of the urban grid into a system of Reduction of the urban grid into a system of
connected spatial elements
Reduction of the urban grid into a system of
connected spatial elements
Computation of the spatial relation between the
elements
Computation of the spatial relation between the
elements
Determination of the parameters that represent
the relational state of the system
Determination of the parameters that represent
the relational state of the system
Reduction of the urban grid into a system of
connected spatial elements
Reduction of the urban grid into a system of
connected spatial elements
Computation of the spatial relation between the
elements
Computation of the spatial relation between the
elements
Determination of the parameters that represent
the relational state of the system
Determination of the parameters that represent
the relational state of the system
configurational indicesconfigurational indices
Some configurational indicesvalerio cutini
giovanni rabino
connectivityconnectivity
The number of spatial elements connected to the
observed one
The number of spatial elements connected to the
observed one
integrationintegration
global integrationglobal integration
The mean topologic distance (depth) from all the
other elements of the system
The mean topologic distance (depth) from all the
other elements of the system
local integrationlocal integration
The configurational techniquesvalerio cutini
giovanni rabino
The way of reducing the urban grid into a system is the
distinguishing element of the several operational techniques
The way of reducing the urban grid into a system is the
distinguishing element of the several operational techniques
axial analysisaxial analysis
spatial spatial
visibility graph analysisvisibility graph analysis
lineslinesspatial
elements
spatial
elements
relationrelation
systemsystem
verticesvertices
intersectionintersection mutual visibilitymutual visibility
axial mapaxial map visibility graphvisibility graph
connection elements
between convex spaces
connection elements
between convex spacespoints uniformly distributed all
over the grid
points uniformly distributed all
over the grid
Axial analisys and VGA: Siena
The urban
grid
of Siena
valerio cutini
giovanni rabino
The integration value in the lines
of the axial map
The integration value in the
vertices of the visibility graph
Configuration and activitiesvalerio cutini
giovanni rabino
Siena
The results show a
narrow(esponential)
correlation between the
density of activities and the
integration value
The configuratrional analysis is
hence proved suitable for
reproducing the distribution of
the levels of centrality within
an urban settlementVolterra
IntroductionIntroduction
Contents
The configurational approach, in shortThe configurational approach, in short
valerio cutini
giovanni rabino
The configurational approach, in shortThe configurational approach, in short
Some case studiesSome case studies
Urban development and configurationUrban development and configuration
ConclusionsConclusions
A small examplevalerio cutini
giovanni rabino
64 lines
Correlation of
local integration
versus
Integration value
1 line16 lines32 lines
128 lines256 lines
versus
global integration
0.872037 4.60934
0.824669
4.60934 R² = 0.999461
Integration [HH]
Integration [HH] R3
0.872037 4.60934
0.824669
4.60934 R² = 0.999461
Integration [HH]
Integration [HH] R3
0.624947 2.48376
0.422392
2.83209 R² = 0.941414
Integration [HH]
Integration [HH] R3
0.624947 2.48376
0.422392
2.83209 R² = 0.941414
Integration [HH]
Integration [HH] R3
0.624947 2.48376
0.422392
2.83209 R² = 0.941414
Integration [HH]
Integration [HH] R3
0.624947 2.48376
0.422392
2.83209 R² = 0.941414
Integration [HH]
Integration [HH] R3
0.590638 2.27936
0.422392
3.02162 R² = 0.866043
Integration [HH]
Integration [HH] R3
0.590638 2.27936
0.422392
3.02162 R² = 0.866043
Integration [HH]
Integration [HH] R3
0.617794 2.33192
0.422392
3.11819 R² = 0.787503
Integration [HH]
Integration [HH] R3
0.617794 2.33192
0.422392
3.11819 R² = 0.787503
Integration [HH]
Integration [HH] R3
0.795544 2.50006
0.422392
3.88512 R² = 0.628534
Integration [HH]
Integration [HH] R3
0.795544 2.50006
0.422392
3.88512 R² = 0.628534
Integration [HH]
Integration [HH] R3
IntroductionIntroduction
Contents
The configurational approach, in shortThe configurational approach, in short
valerio cutini
giovanni rabino
The configurational approach, in shortThe configurational approach, in short
Some case studiesSome case studies
Urban development and configurationUrban development and configuration
ConclusionsConclusions
The diachronic genesis of Grosseto
valerio cutini
giovanni rabino
Distribution of integration
value in Grosseto in the
period 1825-2005
(axial analysis)
1825
1935
196019752005
date 1825 1910 1950 1980 2005
nr. lines 78 109 367 487 629
CM 15.5 11.6 7.2 7.0 5.7
Imin/Imax 0.28 0.34 0.38 0.40 0.42
R2 (Iglo/Iloc) 0.89 0,83 0,82 0,76 0,59
1825
The diachronic genesis of Pisavalerio cutini
giovanni rabino
1910
1950
1980
Distribution of integration
value in Pisa in the
period 1825-2005
(axial analysis)
2005
date 1825 1910 1950 1980 2005
nr. lines 371 455 637 936 1159
CM 9.65 8.43 8.30 7.13 6.64
Imin/Imax 0.28 0.28 0.34 0.33 0.37
R2 (Iglo/Iloc) 0.87 0.82 0.64 0.64 0.57
Findings. 1valerio cutini
giovanni rabino
As the system dimension increases from its primigenial
core, the connectivity mean value decreases
As the system dimension increases from its primigenial
core, the connectivity mean value decreases
As the system dimension increases, the ratio Imin/Imax too
increases
As the system dimension increases, the ratio Imin/Imax too
increases
As the system dimension increases, the R2 value in the
correlation of local integration versus global integration
As the system dimension increases, the R2 value in the
correlation of local integration versus global integration
As the system dimension increases from its primigenial
core, the connectivity mean value decreases
As the system dimension increases from its primigenial
core, the connectivity mean value decreases
As the system dimension increases, the ratio Imin/Imax too
increases
As the system dimension increases, the ratio Imin/Imax too
increases
As the system dimension increases, the R2 value in the
correlation of local integration versus global integration
As the system dimension increases, the R2 value in the
correlation of local integration versus global integration
Any development of the grid involves the addition of new
lines, mostly in the outer ring, whose main features are
poor values of connectivity and global integration, but not
necessarily poor values of local integration
Any development of the grid involves the addition of new
lines, mostly in the outer ring, whose main features are
poor values of connectivity and global integration, but not
necessarily poor values of local integration
correlation of local integration versus global integration
progressively decreases
correlation of local integration versus global integration
progressively decreases
correlation of local integration versus global integration
progressively decreases
correlation of local integration versus global integration
progressively decreases
nr. lines nr. lines
Grosseto Pisa
Findings. 2
valerio cutini
giovanni rabino
The growth of a settlement involves the development of an
inner core, generally characterized by high values of global
integration and connectivity, as well as new development
areas, characterized by poor values of the same indices
The growth of a settlement involves the development of an
inner core, generally characterized by high values of global
integration and connectivity, as well as new development
areas, characterized by poor values of the same indices
The growth of a settlement involves the development of an
inner core, generally characterized by high values of global
integration and connectivity, as well as new development
areas, characterized by poor values of the same indices
The growth of a settlement involves the development of an
inner core, generally characterized by high values of global
integration and connectivity, as well as new development
areas, characterized by poor values of the same indices
If we assume connectivity and R2 as indicators of the
resilience of the system, we can regard the inner core as
the place of urban resilience, while the edges of the
urban area can be regarded as the place of urban frailty
If we assume connectivity and R2 as indicators of the
resilience of the system, we can regard the inner core as
the place of urban resilience, while the edges of the
urban area can be regarded as the place of urban frailty
Such spatial notions appear changing right along as the
settlement grows, in that the edges get progressively
more resilient as new development areas are added
Such spatial notions appear changing right along as the
settlement grows, in that the edges get progressively
more resilient as new development areas are added
If we assume connectivity and R2 as indicators of the
resilience of the system, we can regard the inner core as
the place of urban resilience, while the edges of the
urban area can be regarded as the place of urban frailty
If we assume connectivity and R2 as indicators of the
resilience of the system, we can regard the inner core as
the place of urban resilience, while the edges of the
urban area can be regarded as the place of urban frailty
IntroductionIntroduction
Contents
The configurational approach, in shortThe configurational approach, in short
valerio cutini
giovanni rabino
The configurational approach, in shortThe configurational approach, in short
Some case studiesSome case studies
Urban development and configurationUrban development and configuration
ConclusionsConclusions
Conclusionsvalerio cutini
giovanni rabino
Their spatial structure seems to be induced by a general
principle of optimization, aimed at urbanizing new areas
and connecting them to the existing settlement
Their spatial structure seems to be induced by a general
principle of optimization, aimed at urbanizing new areas
and connecting them to the existing settlement
Cities appear as dendritic systems, irradiating from their
inner core to the farthest development areas
Cities appear as dendritic systems, irradiating from their
inner core to the farthest development areas
Cities appear as dendritic systems, irradiating from their
inner core to the farthest development areas
Cities appear as dendritic systems, irradiating from their
inner core to the farthest development areas
Their spatial structure seems to be induced by a general
principle of optimization, aimed at urbanizing new areas
and connecting them to the existing settlement
Their spatial structure seems to be induced by a general
principle of optimization, aimed at urbanizing new areas
and connecting them to the existing settlementand connecting them to the existing settlementand connecting them to the existing settlement
Some configurational features appear so recurring as to
characterize the new areas with respect to the pre-
existing ones
Some configurational features appear so recurring as to
characterize the new areas with respect to the pre-
existing ones
In such view, even the common notions of periphery and
sprawl can be interpreted as the material appearance of
a system of spatial relations in its ongoing evolution
In such view, even the common notions of periphery and
sprawl can be interpreted as the material appearance of
a system of spatial relations in its ongoing evolution
and connecting them to the existing settlementand connecting them to the existing settlement
Some configurational features appear so recurring as to
characterize the new areas with respect to the pre-
existing ones
Some configurational features appear so recurring as to
characterize the new areas with respect to the pre-
existing ones