Before revision:  This paper proposes a new methodology , termed sDEM , which substantially improves the locality of memory accesses and largely increases the inherent parallelism involved in the computation of radial scanning algorithms.
After revision:  This paper proposes a new methodology called skewed Digital Elevation Model (sDEM) , which substantially improves the locality of memory accesses and largely increases the inherent parallelism involved in the computation of radial scanning algorithms.