Three Dimensional Terrain Data Compression
Using Second Generation Wavelets
Author(s)
B. Pradhan & S. Mansor
Abstract
Terrain data such as Light Detection and Ranging (LiDAR) compression has
been an active research field for the last few years because of its large storage
size. When LiDAR has a large number of data points, the surface generation
represented by interpolation methods may be inefficient in both storage and
computational requirements. This paper presents a newly developed compression
scheme for the LiDAR data based on second generation wavelets. A new
interpolation wavelet filter has been applied in two steps, namely splitting and
elevation. In the splitting step, a triangle has been divided into several
sub-triangles and the elevation step has been used to ‘modify’ the point values
(point coordinates for geometry) after the splitting. Then, this data set is
compressed at the desired locations by using second generation wavelets. The
quality of geographical surface representation after using the proposed technique
is compared with the original LiDAR data. The results show that this method can
be used for significant reduction of the data set.
Keywords: Light Detection and Ranging (LiDAR), Delaunay triangulation,
Triangulated Irregular Network (TIN), geographical information system, lifting
scheme, second generation wavelets.
1 Introduction
Recently, most of the methods for image compression are based on wavelets and
related techniques. Wavelet approaches for image compression tend to
outperform Fourier approaches because of their ability to represent both spatially
localized features and smooth regions in an image. The superior compression
capability of wavelets combined with their natural multiresolution structure
Keywords
Light Detection and Ranging (LiDAR), Delaunay triangulation,
Triangulated Irregular Network (TIN), geographical information system, lifting
scheme, second generation wavelets.
Related Book
Other papers in this volume
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