delineating population clusters
DESCRIPTION
Delineating population clusters. Applying grid methods Niek van Leeuwen Statistics Netherlands [email protected]. Presentation. Occasion Methods Population cluster map Grid methods Results Further research. Occasion. - PowerPoint PPT PresentationTRANSCRIPT
Delineating population clustersApplying grid methods
Niek van LeeuwenStatistics Netherlands
Presentation
Occasion
Methods
Population cluster map
Grid methods
Results
Further research
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
Two methods
- Polygons
network of paved roads and address points
- Grid method
delineating by grids only
Occasion
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.
Methodspopulation cluster map (1)
- morphological delineated area- mainly groups of residential houses- recognizable street pattern (no ribbon development)
- form one cluster when: - separated < 200m
separated > 200m but connected by bridge
- minimum number of dwellings
Methodspopulation cluster map (2)
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
Results, grid6.76 million dwellings, 532 thousand grids (100m)
Results, Calibration set Grid cells combined with residential areas (1)
Results, Calibration set
Grid cells combined with residential areas (2)
MethodsGrid (2) Proximity factor
N
Area
RCIRCLEingridfocalsumoutgrid
1
),,(
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
Dwellingsproximity selection radius 1000m, threshold 200 dwellings / km2
Dwellingsproximity selection radius 200m, threshold 400 dwellings / km2
ResultsArea “Het Westland”, SW of The HagueDwellings per 100m grid
ResultsArea “Het Westland”Proximity; radius 1000m, threshold 200 dwellings / km2
ResultsArea “Het Westland”Proximity; radius 200m, threshold value 400 dwellings / km2
River basin areaNear Gorinchemresidential and other areas in population cluster polygons
River basin areaNear Gorinchemdwellings per 100m grid
River basin areaNear Gorinchemproximity radius 1000m, threshold 200 dwellings / km2
River basin area Near Gorinchemproximity radius 200m, threshold 400 dwellings / km2
Concluding
- Delineating residential area by total number of dwellings is not sufficient
- Proximity is the measure
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
Thank you for your attention