Geoscience Reference
In-Depth Information
Fig. 14
LoD2 with textures from aerial photographs (
left
) and terrestrial photographs (
right
)
Fig. 15
LoD2 model with standardized roofs (
left
) and textures from oblique aerial photographs
(
right
)
applying textures from municipal aerial photographs (Munich, resolution 10 cm) to
the LoD2 Model of the Bavarian Agency for Surveying and Geographic Information
gave insufficient results (Fig.
14
, left). Alternatively texturing from terrestrial photo-
graphs or texturing from oblique aerial photography is possible but demands extra
effort (Fig.
14
, right). Terrestrial photographs are qualified for landmarks respec-
tively important buildings. Additional expenses for oblique aerial photographs are to
be considered besides the costs for the regular flight campaigns.
On the occasion of the National Gardening show in Tirschenreuth 2013,
oblique aerial photographs were taken and an automatic texturing of the 3D
Building Model was carried out. The result was impressive. Automatic texturing
from oblique aerial photographs will be the appropriate method for larger areas to
achieve an attractive visualization (Fig.
15
).
LoD2 Production throughout Germany with 13 standardized roof types reaches
its limits considering some special buildings. In Bavaria there are churches with
a typical roof shape (bulbous domes), that cannot be reproduced with a standard-
ized roof. Applying textures to the automatically generated pyramidal broach roof
results in fragmented textures. Besides that, a more detailed structure of the model
can be required to get more acceptance by the public (Fig.
16
).
One option to improve the LoD2 Model is, to use Google SketchUp for form-
ing cornices, risalits or domes. This means considerable effort in post-editing and
therefore is feasible for landmarks and small projects only. Finally these models
can be imported into Google Earth as kmz files (Figs.
17
and
18
).
