Delineating population clusters

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Delineating population clusters

• Applying grid methods
• Niek van LeeuwenStatistics Netherlands
• nlwe_at_cbs.nl

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Presentation

• Occasion
• Methods
• Population cluster map
• Grid methods
• Results
• Further research

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Occasion

• EU Census 2001, population cluster map, based on
  land use map 2000, production 2005
• Land use map 2003 published in 2006
• More recent statistics on population clusters

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Occasion

• Two methods
• Polygons
• network of paved roads and address points
• Grid method
• delineating by grids only

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Methods

• comparing polygon and grid methods data 2001
• polygon
• - population cluster map
• grid
• - number of dwellings per grid cell
• - proximity factor
• calibration set
• - Combination of polygons and grid cells with
  totalized number of dwellings and proximity
  factors per cell.

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Methodspopulation cluster map (1)

• - morphological delineated area
• mainly groups of residential houses
• recognizable street pattern (no ribbon
  development)
• form one cluster when
• separated lt 200m
• separated gt 200m but connected by bridge
• minimum number of dwellings

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Methodspopulation cluster map (2)
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MethodsGrid (1)

• total number of dwellings per grid
• dwellings from housing register with addresses
• addresses provided with coordinates
• proximity factor
• - each cell calculated a proximity factor

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Results, grid6.76 million dwellings, 532
thousand grids (100m)
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Results, Calibration set Grid cells combined
with residential areas (1)
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Results, Calibration setGrid cells combined with
residential areas (2)
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MethodsGrid (2) Proximity factor
R radius in number of cells N number of cells
involved 100m x 100m grid cell Radius R
N 1000m 10 317 500m 5
81 200m 2 13
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Dwellingsproximity selection radius 1000m,
threshold 200 dwellings / km2
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Dwellingsproximity selection radius 200m,
threshold 400 dwellings / km2
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ResultsArea Het Westland, SW of The
HagueDwellings per 100m grid
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ResultsArea Het WestlandProximity radius
1000m, threshold 200 dwellings / km2
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ResultsArea Het WestlandProximity radius
200m, threshold value 400 dwellings / km2
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River basin areaNear Gorinchemresidential and
other areas in population cluster polygons
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River basin areaNear Gorinchemdwellings per
100m grid
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River basin areaNear Gorinchemproximity radius
1000m, threshold 200 dwellings / km2
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River basin area Near Gorinchemproximity radius
200m, threshold 400 dwellings / km2
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Concluding

• Delineating residential area by total number
  of dwellings is not sufficient
• Proximity is the measure

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Future research

• Grid method
• calibration effects of selection on number
  of residential areas and statistics.
• Adding non dwelling addresses

Vector method - delineating residential areas
from National road file and address points
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Thank you for your attention