Zmiany struktury przestrzennej Białegostoku w latach 1967–2006 na podstawie analizy zdjęć lotniczych

• Autorzy: Nowocień J.

Warianty tytułu

EN

Changes in the spatial structure of Bialystok in 1967–2006 based on an analysis of aerial photographs

• Języki publikacji: PL

Abstrakty

EN

The study aimed to offer an analysis of the spatial structure of Białystok in the period 1967–2006. The analysis was made using aerial photographs and a set of cartographic and geodesic data. Białystok is the largest city of north-eastern Poland and the capital of the Podlaskie region. It is ranked second of all Polish regional capitals in terms of population density. Since the 1960s, Białystok has recorded an over twofold increase in the number of its population. The city has both expanded its area and changed its structure (GUS, 2009). We investigated the materials from two years, 1967 and 2006; their choice was based on the availability of materials. Based on the aerial photographs from 1967, J.R. Olędzki prepared a number of maps depicting the structure of Białystok. The findings from this research were presented in the paper entitled “Application of aerial photographs in the study of urbanised areas” (in Polish) and formed the basis for the research relating to the year 1967 (Olędzki, 1981). The most recent aerial photographs of Białystok on the scale 1: 26 000 come from 2006, which allowed for analysing the city’s spatial structure at two points in a period spanning 40 years. Over this period, the city has undergone substantial changes. Our interpretation has proved that aerial photographs can be useful in making analyses of land use changes in the city. For both these years, we analysed the area occupied by the city in 2006, which at that time was 10 212 hectares. We made two separate maps for either year, viz.: “Białystok – spatial structure in 1967”, and “Białystok – spatial structure in 2006”. On their basis, another map was produced: “Białystok – changes in the spatial structure in 1967–2006”. Using geoinformation software (QGIS, ArcMap), we were able to compile statistics to characterise these maps. To prepare the aforementioned maps, we used the following materials: map “Białystok – spatial structure of land use in the city”, map “Białystok and compactness of its development”, aerial photographs, topographic maps, map of the Białystok district from the 1960s, city map and a 3D city development model. In order to prepare the maps, we needed to convert the aerial photographs, which involved finding one system of coordinates for them. The geometrised, colour aerial photographs were subject to a visual interpretation. The photographs which were used were digitalised. The process of interpretation was carried out on a computer screen without using any ready to use patterns. The interpreted objects were drawn on the photographs as separate vector layers, with additionally coded polygons as their corresponding forms of land use. To compare the studies prepared on the basis of aerial photographs from 2006 and 1967, we used the key to the map “Białystok – spatial structure of land use” made by J.R. Olędzki (1981), which was however subject to slight modifications. One of the elements distinguished on the maps was the division of buildings into five categories based on their height. Due to varied source materials for the two years in question, the height analysis was conducted in two ways, and on every such occasions the buildings were divided into categories: buildings to 7 m, buildings to 15 m, buildings to 20 m, buildings to 30 m and buildings taller than 30 m. In order to defi ne the characteristics of land use in 1967, we analysed the map “Białystok – spatial structure in 1967”. The largest area was at the time occupied by forests, meadows and arable land having a total of over 7 000 ha, which accounted for over 70% of the area in question. This can be viewed as a proof of the area’s rural character, which is also corroborated by a large share of low buildings (up to 15 metres). This mainly included dispersed development, with residential and farms buildings as well as backyards. No parkings were shown on the map owing to their small size. A quantitative characteristic of the land use in 2006 is shown on the map “Białystok – spatial structure in 2006” (Fig. 10). The map also shows the buildings in five categories of height. The largest areas were occupied by meadows (over 2 600 ha) and forests (over 2 200 ha), followed by buildings up to 15 metres in height. In order to compare the land use in Białystok in the years 1967–2006, we prepared the map “Białystok – changes of spatial structure in 1967 –2006” (Fig. 14.). This map was drawn on the basis of two maps depicting the city’s spatial structure in 1967 and 2006. The map was produced by intersecting the two aforementioned maps. Then, in order to highlight the changes and make the map easier to read, we removed those polygons where the structure of land use in both years in question was similar. The remaining polygons were depicted in two ways: for 1967 - with colours, and for 2006 – with hatching. Finally, the road and river network valid for 2006 was added. The most significant changes could be seen in the acreage of arable land: in 1967, it occupied 3 991 ha, which accounted for 39.08% of the city’s area, and in 2006 – a mere 561 ha, i.e. 5.49%. This is a proof of the city’s development and the change of its character from rural to urban. Over the past 40 years, the spatial structure of Białystok has changed considerably. In the 1960s, a considerable part of the city’s area within the present administrative boundaries was used as arable land, and urbanised areas made up only 23% of the area of the city. In 2006, nearly half of the area of Białystok was under land use having typically urban functions. The application of aerial photographs and geoinformation methods opens many possibilities offered by such materials and methods in the study of the spatial structure of urbanised areas. They also make it possible to prepare a comprehensive q – quantitative analysis of the areas under research.

Słowa kluczowe

PL

Białystok; struktura przestrzenna; użytkowanie ziemi; mapa; zdjęcia lotnicze

EN

Białystok; spatial structure; land use; map; aerial photographs

• Wydawca: Polskie Towarzystwo Geograficzne, Oddział Teledetekcji i Geoinformatyki
• Czasopismo: Teledetekcja Środowiska
• Rocznik: 2011
• Tom: T. 45
• Strony: 51--65
• Opis fizyczny: Bibliogr. 16 poz., rys., tab., wykr.

Twórcy

autor

Nowocień J.

• Wydział Geografii i Studiów Regionalnych Uniwersytetu Warszawskiego

Bibliografia

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