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Fig. 11.2 Reconstructive geovisualisation of the Klášterec nad Ohrí town. Black - Eighteenth
century, grey - Nineteenth century, white - Twentieth century
and continuing to the past or any destroyed development was complemented. As
regards any disputable parts of the development, field surveying proved the age of
the building and its inclusion into a particular time horizon.
Visualisation of development within the scope of alternative scenarios of future
landscape was accurate when for non-existent development we used a territorial
plan and strategic plan of development of the town of Klášterec nad Ohrí.
In the end, mainly for the purposes of more intuitive understanding of space,
as is mentioned for example by Kraak et al. (2002), a 3D model of the town was
created in the particular time horizons. As regards geometry, 3D models of build-
ings comprise of ground plan, information concerning height and roof shape. The
ground plan of buildings was obtained from the above-mentioned vectorisation of
ortho-photographs and for non-existent historic buildings from cadastral maps. The
height and in some cases also the roof shape was gained through a method described
for example by Suveg and Vosselman (2000), when the ground plan of buildings is
divided into elementary geometric shapes and they are allocated one of three roof
types (a flat roof, a gable roof and a hip roof). In a 3D model, the actual vege-
tation was replaced with the corresponding 3D image of the individual vegetation
elements, for which a 3D Dosch database was used. The resulting models were
exported into VRML format, for static 2D images we used JPEG format.
On the basis of the implemented reverse reconstruction and field surveying, we
created a 3D model of the urban landscape of Klášterec nad Ohrí, the visualisation
of which can be seen for instance in Raška et al. (2007). The grey tones are used
to depict the parts of development corresponding to the particular time horizon.
For visualisation of an alternative scenario of the urban landscape we used two
approaches. In the first case we used a 3D model and we represented the changes
by means of 3D primitives, in the second we created photo-realistic views of the
individual changes in the landscape (see e.g. Colwell, 1997) on the basis of the data
specified in the territorial plan and from the field survey (Figs. 11.3 and 11.4). The
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