Adaptive surface meshing and multiresolution terrain depiction for SVS

Thorsten Wiesemann; Jens Schiefele; Wolfgang Kubbat

doi:10.1117/12.438015

28 August 2001 Adaptive surface meshing and multiresolution terrain depiction for SVS

Thorsten Wiesemann, Jens Schiefele, Wolfgang Kubbat

Proceedings Volume 4363, Enhanced and Synthetic Vision 2001; (2001) https://doi.org/10.1117/12.438015
Event: Aerospace/Defense Sensing, Simulation, and Controls, 2001, Orlando, FL, United States

Abstract

Many of today's and tomorrow's aviation applications demand accurate and reliable digital terrain elevation databases. Particularly future Vertical Cut Displays or 3D Synthetic Vision Systems (SVS) require accurate and hi-resolution data to offer a reliable terrain depiction. On the other hand, optimized or reduced terrain models are necessary to ensure real-time rendering and computing performance. In this paper a new method for adaptive terrain meshing and depiction for SVS is presented. The initial data set is decomposed by using a wavelet transform. By examining the wavelet coefficients, an adaptive surface approximation for various Level-of-Detail is determined. Additionally, the dyadic scaling of the wavelet transform is used to build a hierarchical quad-tree representation for the terrain data. This representation enhances fast interactive computations and real-time rendering methods. The proposed terrain representation is integrated into a standard navigation display. Due to the multi-resolution data organization, terrain depiction e.g. resolution is adaptive to a selected zooming level or flight phase. Moreover, the wavelet decomposition helps to define local regions of interest. A depicted terrain resolution has a finer grain nearby the current airplane position and gets coarser with increasing aircraft distance. In addition, flight critical regions can be depicted in a higher resolution.

Citation Download Citation

Thorsten Wiesemann, Jens Schiefele, and Wolfgang Kubbat "Adaptive surface meshing and multiresolution terrain depiction for SVS", Proc. SPIE 4363, Enhanced and Synthetic Vision 2001, (28 August 2001); https://doi.org/10.1117/12.438015

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KEYWORDS

Wavelets

Databases

Visualization

Wavelet transforms

Data modeling

Vector spaces

3D displays

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