1 / 13

Workshop on Land Accounts and Urban Morphology, ETC-CE, 12 July 2006

This workshop explores the classification of European urban areas based on their compactness level and shape diversity. It discusses the determinants of areal extent contrasts, population size variations, and tendencies towards compactness or sprawl. The workshop also examines the influence of national planning features, local perturbations, and topography on urban morphology. The need for a combination of indices to quantify shape variations and a typology of agglomeration extension patterns is highlighted. Overall, this workshop aims to provide a framework for comparing the shape of European agglomerations and analyzing their potential for sustainable cities.

matthewwatson
Download Presentation

Workshop on Land Accounts and Urban Morphology, ETC-CE, 12 July 2006

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Workshop on Land Accounts and urban morphology, ETC-CE, 12 july 2006 A classification of European urban areas on a double scale of compactness Marianne Guérois Université Paris 12, C.R.E.T.E.I.L. Associated to UMR Géographie-cités, Paris

  2. Ph-D in 2003 : How to characterise the compactness level of European agglomerations in a comparative way ? > A unique model of « compact city » VS diversity of urban shapes throughout Europe ? • CLC well-suited to staging comparisons often impeded by heterogeneous nature of source of information

  3. What are the main determinants of areal extent contrasts ? • Built-up surface = an elementary and relevant estimate of the absolute degree of sprawl • Urban areas > 200000 inh. in 1990

  4. How does areal extent vary when population size increases? • Strong correlation with population size, even within a cross-national frame • Linear fit : +1,5 km² per 10 000 inh. • Residual values highlight trends towards sprawling or compact extensions

  5. Tendencies to compactness, tendencies to sprawl • On a European scale, a south-to-north gradient • Predilection for urban values • inherited from Latin culture? • Spatial diffusion process of peri-urbanisation? • National determinants : • Dutch agglomerations • A careful link to national planning features • Local « perturbations » • Influence of topography but not • only…

  6. A second dimension of morphological compactness : The urban « footprint » • To complete areal extent and population density approach, a comparison of built-up global design (> 500 000 inhab. in 1990) • Three significant features : Elongation Digitation Indentation • How to convert qualitative descript° into numeric expressions ?

  7. How to quantify shape variations ? A selection of indices > Ratios between elementary parameters (area, perimeter, Longest axis …) > Values range from 0 (linear or digited shape) to 1 (circular shape) Limits ? > Circle as an absolute reference > Some measures remain ambiguous

  8. The need for a combinaison of indices A test on schematic shapes Results of the multivariate analysis (PCA) : > Axis 1 (79%) = global distance to the circle feature > Axis 2 (16%) = linear VS digital shapes => Each specific pattern can be identified by a set of indices

  9. Extreme positions of agglomerations for each index

  10. A typology of agglomerations extension patterns • Cluster analysis 6 relevant types of shape • No regional consistency • Strong influence of topography, but also…

  11. 2 dimensions of compactness

  12. 2 dimensions of compactness • No correlation between those two dimensions of compactness • Must be crossed

  13. CONCLUSION Crossing these two dimensions of morphological compactness provides original framework to compare the shape of European agglomerations CORINE Land cover potential regarding urban analysis at this scale … A careful link between morphological features and normative discourses about sustainable cities … what description for suburban extents ? … The need for a state of the art about classification of European cities shapes

More Related