Α-SHAPES IN DIGITAL TERRAIN MODELING

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AMINI J.; RASTVASI H.

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Journal: Year:2007 | Volume:40 | Issue:8 (102) Page(s): 1067-1076

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Title

Α-SHAPES IN DIGITAL TERRAIN MODELING

Author(s)

AMINI J. | RASTVASI H. | Issue Writer Certificate

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Abstract

Advances in 3D data-acquisition hardware have facilitated the more widespread use of scanning to document the geometry of physical objects for archival purposes or as a step in new product design. A typical 3D data acquisition pipeline consists of the following steps:canning: Acquisition of surface samples with a measurement device, such as a laser range scanner or a stereographic system.Data registration: Alignment of several scans into a single coordinate system.Data integration: Interpolation of the measured samples, or points derived from the measured samples, with a surface representation, usually a triangle mesh.Model conversion: Mesh decimation/optimization, fitting with higher-order representations etc.This paper focuses on the data integration phase. We present a method for finding a triangle mesh that interpolates an unorganized set of points. The method is α-shapes. An α-shape is a polytope that is neither necessarily convex nor connected and can be derived from the Delaunay triangulation of the point set, with a parameter controlling the desired level of detail. The set of all values leads to a discrete family of shapes capturing the intuitive notion of "crude" versus "fine'' shapes of a point set.The main application of α -shapes is the reconstruction of objects which have been sampled by points. For instance, a 3D-scanner provides points on the surface of a humanbeing or so.In this paper we used the α-shapes for reconstruction of a Digital Terrain Model (DTM). Delaunay interpolation method is usually used as an approach for reconstruction a DTM. This algorithm has some limitations in expression of complex objects for example break lines in DTM. Therfore α-shapes can be improved the limitations and fill the gapes derived from delaunay interpolation.

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APA: Copy

AMINI, J., & RASTVASI, H.. (2007). Α-SHAPES IN DIGITAL TERRAIN MODELING. JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN), 40(8 (102)), 1067-1076. SID. https://sid.ir/paper/14144/en

Vancouver: Copy

AMINI J., RASTVASI H.. Α-SHAPES IN DIGITAL TERRAIN MODELING. JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN)[Internet]. 2007;40(8 (102)):1067-1076. Available from: https://sid.ir/paper/14144/en

IEEE: Copy

J. AMINI, and H. RASTVASI, “Α-SHAPES IN DIGITAL TERRAIN MODELING,” JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN), vol. 40, no. 8 (102), pp. 1067–1076, 2007, [Online]. Available: https://sid.ir/paper/14144/en

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