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Gis update2010 som-legibility

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Presented at http://www.geo.ed.ac.uk/gisupdate/ in 2010

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Gis update2010 som-legibility

  1. 1. GISUpdate2010 1 Understanding ‘Desakota’: The Case Study of Jakarta Vlad Tanasescu , William Mackaness, Stephen Cairns, Ray Lucas http://ddm.caad.ed.ac.uk/groups/jakarta/
  2. 2. GISUpdate2010 2 Outline • Jakarta • Desakota • Maps, Video & Questionnaire • Self Organising Maps • Interpretation • Conclusion
  3. 3. GISUpdate2010 3
  4. 4. GISUpdate2010 4 Jakarta • Global City of the South - Fourth most populous city in the world: 23 m • Elevation 4m • 87% Muslim • Poverty, congestion, horrendous traffic, stifling pollution, endemic corruption
  5. 5. GISUpdate2010 5
  6. 6. GISUpdate2010 6 Focus • The Image of The City by Kevin Lynch: • the legibility of the city - "...the ease with which its parts may be recognised and can be organised into a coherent pattern." • Our focus: the Desakota • Longitudinal study: ‘a strip’ • Research questions..perception, opportunity, impediment..
  7. 7. GISUpdate2010 7 Desakota • ‘village – town’ • Sociological, ecological, political, informal space…. • Differentially stressed…eg access to services • Rapid displacement, migration, commercialisation commercial/ subsistence agriculture • mixed household economy - straddles the periurban
  8. 8. GISUpdate2010 8 The Urban
  9. 9. GISUpdate2010 9 The Rural
  10. 10. GISUpdate2010 10 Kampung, Desa, & Gated Communities • Kampung – urban settlement • Desa – rural village • Gated Communities
  11. 11. GISUpdate2010 11
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  13. 13. GISUpdate2010 13 Methodology • Architectural students • Interviews • Cognitive Maps • Questionnaires
  14. 14. GISUpdate2010 14 Methodology
  15. 15. GISUpdate2010 15
  16. 16. GISUpdate2010 16 Questionnaire • Ethnicity • Community • Land ownership • Education • Access to services • Social isolation • Mobility • …. • 1000 • 39 variables • Data preparation -Normalisation
  17. 17. GISUpdate2010 17 Tenure Communit y Occupation City_visit Access to service Ethnicity Mobility Education
  18. 18. GISUpdate2010 18 Self Organising Map • “a similarity graph, and a clustering diagram, too. Its computation is a nonparametric, recursive regression process” (Kohonen, 2000) • Form of artificial neural network. • Computationally intensive. • unsupervised learning algorithm (neural networks)
  19. 19. GISUpdate2010 19 Purpose • Represent high-dimensional data in a low- dimensional form without loosing any of the 'essence' of the data. • Organise data on the basis of similarity by putting entities geometrically close to each other.
  20. 20. GISUpdate2010 20 SOM
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  23. 23. GISUpdate2010 23 Worldpovertymap http://www.cis.hut.fi/research/som-research/worldmap.html
  24. 24. GISUpdate2010 24
  25. 25. GISUpdate2010 25 A Component planes Ethnicity: Betawi, Javanese, Sudanese, Other
  26. 26. GISUpdate2010 26 Isolation
  27. 27. GISUpdate2010 27 Isolation… both Desa and Kampung
  28. 28. GISUpdate2010 28 Recent development City resident: time Land ownership Gated medium large Communities:
  29. 29. GISUpdate2010 29 Melting Pot Kampung Desa Betawi Sudanese Javanese Other
  30. 30. GISUpdate2010 30
  31. 31. GISUpdate2010 31 Principle Component Analysis • Patterns among high dimensional data • Calculates eigenvectors from covariance matrices • Measure variability in responses, discern and account for groupings, identify opposing groups
  32. 32. GISUpdate2010 32
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  36. 36. GISUpdate2010 36 Conclusion • Exploring the Desakota • Combination of EDA techniques • ‘linking’ with video • Further Develop methodology • Apply in China and India – global cities of the south..

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