Efficient Map Overlay for Safety-Critical Embedded Systems

Computational geometry algorithms are more and more frequently used in industrial embedded systems. These new applications require not only highly efficient implementations that run with limited computational resources, but also algorithms that are capable to robustly handle all geometric situations in a consistent way. In this paper, we present the adaptation and implementation of a map overlay algorithm, which originates from the area of geographical information systems. Besides the adaptation to an embedded platform, mainly two problems have to be tackled: First, safe results must be computed with limited precision arithmetic and second, map data must be adequately simplified to meet on the one hand real-time requirements, and on the other hand robustness criteria.