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Petra Zimmermann 
  
2.2 The new Dataset of Zürich Hongg 
We used the well-known Avenches dataset (Mason et al, 1994) and the new AMOBE II dataset of Zürich 
(Zimmermann, 2000). This dataset covers an area nearby the centre of Zürich (Switzerland) and the ETH Hónggerberg 
(Figure 1). The region comprises the old centre of the quarter Hóngg, different residential areas with different types of 
buildings (flat roofs, hip roofs etc.), other man-made objects like places, bridges and streets, different kinds of 
vegetation (forest, single trees, meadow, vineyard, gardens etc.), and the Limmat river. The region is situation in the 
Limmat Valley so that the mapped area has a strong slope. 
ETH 
   
  
waste te lmtp dv A Kimo 
Figure 1: Map of Ziirich and the situation of the aerial Figure 2: Manually measured DTM data shown as regular 
images of the Zürich Hóngg dataset grid 
The data is based on a 2x2 image block collected over Zürich at an image scale of 1:5000. It consists of two models 
from two neighbouring strips flown directly over the quarter Hóngg. The 23cm x 23cm colour photographs were 
scanned at 14 um (Figure 3). This photography was flown 1050 m over ground with 65% forward and 45 % sidewards 
overlap. A raster digital terrain model (DTM, Figure 2) without building or tree elevation data and a digital surface 
model (DSM) (Figure 4) were generated to support the processing. 
  
  
Figure 3: One aerial image, No 59 of the new dataset Figure 4: DSM of Image Pair 58/59 computed by 
the commercial software Virtuozo 
  
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B3. Amsterdam 2000. 1065