- surface
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; models
istruction
anes are
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one of the five buildings with multiple intersecting roof planes
is also reconstructed very well, since its ridge lines are
completely inferred from Lidar data. The other 33 buildings
cannot be reconstructed correctly since the important structural
lines on their roofs are covered by trees or the outlines of small
structures are not drawn on the topographic map. All of these
incorrect models should be refined manually, by
photogrammetry, outline estimation from Lidar data, and even
field work, for instance.
5. CONCLUSIONS
The residual tensor ellipses presented here can be regarded as
indicators to evaluate the quality of registration and to show
where manual modification may be needed during model
construction. The experiments have shown that the proposed
method for the building reconstruction procedure with Lidar
data and topographic map information, including feature
extraction, registration, reconstruction and quality analysis, can
be processed automatically and yields reliable results. Although
manual editing is needed in order to achieve refined 3D
building models, the results have shown that our method can
save time and expense for model construction by using tensor
ellipses.
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