Surfacing the Statue of Liberty
In this example FarField Technology's
SilverLining™
was used to fit a surface to a LIDAR scan of the Statue of Liberty*.
Data were acquired from a limited number of scan positions taken at oblique viewing angles.
No data was recorded from the back of, or above, the statue. Consequently there are very large holes in the fitted surface.
An error-bar fit was used to fit the smoothest surface within 0.01m of the data - sufficient accuracy for this application.
Anti aliasing
A low pass filter
was automatically employed during mesh generation in the figure below and for the detail view of the face shown opposite to avoid aliasing artifacts since
the facet size (mesh sampling interval) was greater than the finest level of detail present in the raw data.
This example illustrates:
- The remarkable surface extrapolation ability of RBFs
- The ability to fit to data with varying data density
- The restricted viewing
angles encountered when scanning large objects
- The problems of occlusion encountered with real scans of large objects
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Fitting statistics
- 3,360,300 data points
- 402,118 RBF centers
- Height 76m
- Fit tolerance 0.1m
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| *Lidar data courtesy of Cyra Technologies |
