The study area consists of a 7 6 km rectangle that covers central Stockholm (Fig. 2). The official built-environment data were scanned and digitised, and the five most common built-environment characteristics in the study area were selected for verification. The other built-environment characteristics were rare and/or were based on their historical significance, e.g., the island that contains the old town, which dates to the 13th century, and the so-called newer small-scale urban enclaves.
In Fig. 3, the locations of the five selected built-environment characteristics are shown on an aerial photograph. Fig. 4 demonstrates some of the morphological differences in the form of 300 300 m portions of 1 1 m orthophotos produced by the City of Stockholm. The locations of the five selected built-environment characteristics and the morphological differences are visualised in Figs. 3 and 4, as detailed below.
The ‘Inner City’ (A) built environment occupies the northeastern quarter of the study area. The ‘Inner City’ is divided by gridded streets that house Stockholm’s central business district; the area represents the city and city life for most of the inhabitants. The ‘Inner City’ has expanded several times since the 17th century, and it is mainly characterised by dense city blocks that are interspersed with town squares, parks and a variety of economic activities.
‘Industry’ (B) is scattered throughout the study area and is a general category that includes larger areas built specifically for a particular use, including industry, offices, warehouses and freight terminals.
‘Single-Family Housing’ (C) is located in the southern and western parts of the study area (Fig. 3). Primarily built during the 1910s and 1920s, the city actively concentrated houses in these areas.The early settlements of these types in the 1910s were based on the expansion of the tram network from the inner city. These settlements are primarily wooden single-family houses with gardens(Utställningsförslag, 1997).