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CITY CENTER DELIMITATIONOlomouc case study
Jaroslav Burian
First StatGIS conference
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CITY CENTER DELIMITATIONOlomouc case study
Jaroslav Burian
First StatGIS conference
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Introduction
• Different ideas about delimitation of city centre• “Centre is defined as a core district of a city with the
most intensive commercial occupancy of an area in where shops, financial and cultural institutions and branch offices of big companies are concentrated.”
• An objective delimitation of a city centre is important – For a statistical comparison of parameters and
data from different cities
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City centre
• Research of an inner structure of a city is one of the priorities of the current city geography
• In Central Europe delimitation of city centers mostly on a theoretical level
• Based on a historical development of a city • Different aproaches– City is divided into a historical centre, an inner city and an
outer city – A city centre (old town) is usually represented by a
medieval core of a city and its immediate surroundings
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Study Area
– Olomouc region– 102 000 inhabitants– area over 103 km2
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Delimitation of Olomouc City Centre Currently in Use
• Several delimitations of the city centre in Olomouc: – The city district Olomouc – centre – The cadastral district Olomouc – city
– The basic settlement unit – historical centre – Historical town reserve – The functional area of the inner city in the municipal plan
– The economic subcentre core
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City district Olomouc – centreCadastral district Olomouc – city
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Economic subcentre coreBasic settlement unit – historical centre
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Functional area of the inner city -municipal planHistorical town reserve
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Comparison
used delimitations of centre delimitated area [km2]
municipal plan – the functional area of the inner city 0.595
the basic settlement unit – Olomouc historical centre 0.842
the historical town reserve 0.961
the economic subcentre core 1.389
the city district Olomouc – centre 2.279
the cadastral district Olomouc – city 2.708
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Delimitation of city centre usingusing GIS
Data– Vector layers in dgn and shp formats in scales from 1:2 000
to 1:10 000
Software– ArsGIS 10– Repeating Shapes toolfor ArcGIS→ creation of a regular networkof points or polygons in a range specified by a user
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Delimitation of City Centre According to Price Map
• by means of the price map of Olomouc on the basis of the most expensive pieces of land in the city centre – average price - 1 109.5 CZK/m2 – minimum price - 100 CZK/m2
– maximum price - 9770 CZK/m2
– To delimitate the city centre, pieces of land with price higher than 2 600, 5 000 and 9 000 CZK/m2 were selected
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Delimitation of City Centre According to Price Map
price [CZK/m2]
delimitated area [km2]
more than 2 600 0.566
more than 5 000 0.81
more than 9 000 0.203
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Delimitation of City Centre According to Density of Services
• Public Services Database • Repeating Shapes tool – several regular polygon
grids of various shapes (hexagons, squares, triangles) and sizes were created (hexagonal was the best)– For each individual polygon a number of services in it
was counted → 5% of the polygons with the highest concentration were selected
– The biggest continuous area of polygons comprising the city centre was selected
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Different polygon shapes
Area of delimitated centre [km2]
Areas of polygons [km2] Triangles Squares Hexagons
0.005 0.250 0.180 0.260
0.01 0.280 0.290 0.300
0.015 0.285 0.270 0.270
0.02 0.300 0.280 0.300
0.025 0.275 0.300 0.375
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Delimitation of City Centre According to Density of Services
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Delimitation of City Centre According to Density of Public Transportation lines
• The city of Olomouc corresponds with a monocentric model of a city - most of the main roads lead to the centre
• For each polygon a density of bus and tram lines was calculated → the polygons with the highest density were selected
• This method of delimitating the city centre proved to be unsuitable (low density of the lines - the historical centre of Olomouc is a pedestrian zone surrounded by parks)
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Delimitation of City Centre According to Density of Public Transportation Lines
• The density of the publictransportation lines in ahexagonal grid, polygonsof which have the area of50 000m2 and 250 000 m2
• The public transportationsystem basically bypassesthe centre
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Delimitation of City Centre According to Mental Maps
• Mental maps (of Lynch's type) tend to differ significantly with respect to the borders of the city centre
• The group of 40 respondents (students of Palacky University)
• Drawing the city centre in an aerial photograph of the city according to their individual perception
• The data were subsequently summed up using the tools of map algebra in the ArcGIS SW
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Delimitation of City Centre According to Mental Maps
• The result was divided into 5 categories; each of these represents an accordance of a given percentage of the students on a particular delimitation
• The category on which most of the respondents agreed (more than 80%) is the smallest one
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Delimitation of City Centre According to Mental Maps
Accordance [%] Area [km2]
0 - 20 1.473
21 - 40 0.880
41 - 60 0.540
61 - 80 0.301
81 - 100 0.273
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Comparison with other delimitation
• Both the appearance andthe area of the two smallestdelimitations is similar to thedelimitations according to theprice map and the density ofservices
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Conclusion
• The best results were achieved when delimitating the centre according to the price map and the density of services and these areas were delimitated very similarly
• These areas also corresponded with the mental maps of the inhabitants of the city
• These methods are appropriate for delimitation of the city centre
• In comparison with the delimitations already in existence the delimitations acquired in this research were significantly smaller
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dr. Jaroslav Burian
Department of Geoinformatics, Faculty of SciencePalacký University, Olomouc, Czech Republic