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December 13, 2018 
Zurich Hoengg (Switzerland) data set

Additional data:

Digital Surface Model and Digital Terrain Model

Download here a zip-tar file (12 Mb) with all the additional information (2 DSMs, 1 DTM, the buildings as DXF, DGN and DWG files,6 object points for each cut-out with object and pixel coordinates).


1. Digital Surface Model

Two DSMs are distributed optional as examples of the results obtainable automatically without manual editing with commercial software. As opposed to a DTM, the DSM includes modelling of the surface of all entities e.g. buildings, and not just the terrain. It was computed using a pyramid-based correlation technique on the Virtuozo. Figures 6 and 8 illustrates these DSMs represented as grey level images, and Figures 7 and 9 show the same date shaded and artificial coloured to better show the elevation variations. The bright blobs in the grey level images represent the higher points, e.g. houses and tree stands. The colour tables of both DSMs are different, dark green signalises less elevation. Then bright green, yellow or brown. The DSM was generated with a Patch size of 15 by 15 and column and row space of 15. The resulting grid has a resolution of 1m.

58_59_hoeng.dat DSM from 47009_2058.tif and 47009_2059.tif made with Virtuozo ASCII (x,y,z)

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Fig. 6 Computed DSModels with Virtuozo Software 58_59_hoengg.dat

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Fig. 7 Computed DSModels with Virtuozo Software 58_59_hoengg.dat

North 252284.0
West 679180.0
East 680146.0
South 250065.0

Table 2 Situation of the DSM in Swiss Landeskoordintensystem



87_88_hoeng.dat DSM from 47008_2087.tif and 47008_2088.tif made with Virtuozo ASCII (x,y,z)

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Fig. 8 Computed DSModels with Virtuozo Software 58_59_hoengg.dat

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Fig. 9 Computed DSModels with Virtuozo Software 58_59_hoengg.dat


North 251664.0
West 679554.0
East 680521.0
South 250472.0

Table 3 Situation of the DSM in Swiss Landeskoordintensystem
 


2. Digital Terrain Model (DTM):

A separate ASCII file contains DTM information. The data given is the result of resampling the original measurements on a 10 meter grid. The original data was manually measured on an AC3 analytical plotter.The DTMs model (only) the terrain does not include the buildings.

The slope of the terrain from the top of the hill at ETH Hoenggerberg down to the Limmat River is observable.


Fig. 10 DTM data shown as regular DXF gridimage


Buildings
We provide also a reference dataset measurement, made by CyberCityModeller. A separate DXF file contains building roof models. These models are represented in terms of line entities measured by Cyber City Modeller.

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Fig. 11 DTM overlayed with DXF data of buildings, see details below

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© Institute of Geodesy and Photogrammetry, ETH Zurich