International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B4. Istanbul 2004
calculated. This will be achieved using a least squares
adjustment process, where observations in terms of differences
in shape will be introduced as a functional model — the
stochastic model will describe the accuracies of the original
shapes. This process then will lead to a local adaptation of the
individual corresponding objects, but also of their local
environment. Too large discrepancies of the shape boundaries
will be considered as outliers and can be treated in the
subsequent overlay and analysis step.
ay,
Fig. 5 : Visualisation of changes between topographic content
from ATKIS and geological map, after applying ICP
algorithm and area-threshold filtering.
At the end of the project constraints for every data set can be
defined which will facilitate the creation of a weighted
geometry or a so called master data set which is the common
idea of map conflation.
In the near future the introduction of punctual and linear
elements will enhance the process of geometric integration,
because at this stage of the project only polygons are evaluated.
Further work will concentrate on partial matching that often
occur at object boundaries: e.g. a geoscientific object ends at a
river or road. This means, that these features have a part of the
river or road boundary in common. In order to identify these
partial correspondences, it is necessary to appropriately
segment these objects.
Due to the fact that only the geometry of linked objects is
changed and adjusted during the workflow the neighborhood
remains unchanged. These discrepancies will be removed at the
end of the integration process, to ensure à topologically
consistent model, the data management system from the
federated data base is capable of validating the topology
structure to avoid saving corrupt data.
ACKNOWLEDGEMENTS
This is publication no. GEOTECH-66 of the
GEOTECHNOLOGIEN project funded by the Federal Ministry
for Education and Research (BMBF) and the German Research
Council (DFG) under contract 03F0374A.
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1254
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